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Calculate percentages, ages, dates and other everyday math.

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309 Tools

  1. 3D Model Scale CalculatorResize model dimensions between scale ratios and calculate the exact slicer percentage, area change and volume change.Calculators
  2. 3D Print Filament Cost CalculatorEstimate filament, electricity, machine time and a customer quote from real slicer and spool details.Calculators
  3. 401(k) CalculatorProject your 401(k) balance at retirement, including your employer's matching contributions.Calculators
  4. A/B Test Significance & Sample Size CalculatorPlan the sample needed per variant, then analyze conversion-rate uplift, p-value and statistical significance.Calculators
  5. Acceleration CalculatorCalculate acceleration from initial velocity, final velocity and elapsed time with common speed and time units.Calculators
  6. Acceleration ConverterConvert acceleration among m/s², ft/s², standard gravity, Gal and speed-change units with an auditable SI base.Calculators
  7. Ad Metrics Calculator (CPM, CPC, CTR, CPA)Turn impressions, clicks, spend and conversions into CTR, CPC, CPM, conversion rate, CPA and ROAS at once.Calculators
  8. Add Or Subtract Dates CalculatorMove a calendar date by years, months, weeks and days with reliable end-of-month handling.Calculators
  9. Age CalculatorCalculate age or the exact difference between two dates in years, months, weeks, days, hours, minutes and seconds.Calculators
  10. Airline Baggage Size & Weight CheckerCompare one bag against multiple editable airline and fare limits, including rotated dimensions, linear size and weight.Calculators
  11. Amortization Schedule CalculatorSee a full month-by-month (or yearly) loan payoff schedule with principal, interest and balance.Calculators
  12. Angle ConverterConvert degrees, radians, gradians, turns, arcminutes, arcseconds and NATO mils from an exact radian base.Calculators
  13. APR CalculatorConvert a quoted rate plus lender fees into the true annual percentage rate of a loan.Calculators
  14. APY CalculatorSee how much a savings account or CD grows at a given APY over time.Calculators
  15. Area ConverterConvert metric, US customary, land and survey-scale area units with exact factors.Calculators
  16. Aspect Ratio CalculatorCalculate dimensions, compare contain or crop framing, animate between formats and export a production resolution ladder.Calculators
  17. Atomic ClockView a precise device-clock display for UTC, local time and major world zones with milliseconds, ISO time, Unix time and a truthful NIST-F4 reference.Calculators
  18. Audio & Video Sync Delay PlannerEstimate acoustic travel, electronic latency and the audio or video correction needed for lip sync and distributed sound alignment.Calculators
  19. Audio Data Rate, Network & Room Acoustics CalculatorPlan PCM storage, Dante/AES67-style network fabrics, packet flows, wavelength and preliminary room-mode behavior in one engineering desk.Calculators
  20. Auto Loan CalculatorEstimate your car payment from price, down payment, trade-in, sales tax, rate and term.Calculators
  21. AV Cable Conduit Fill & Jam-Ratio CalculatorBuild a mixed cable schedule, compare material-specific pathway sizes, enforce future reserve and screen three-cable jam geometry.Calculators
  22. AV IP Address Schedule & VLAN Table GeneratorGenerate CIDR-safe IPv4 device schedules that exclude gateway and reserved ranges, flag conflicts and document VLAN assignments.Calculators
  23. AV Rack Builder & Equipment Elevation PlannerCompare common rack heights, drag equipment through interactive multi-rack elevations and verify RU, depth, weight, power, thermal, airflow and feed limits.Calculators
  24. AV Rack Heat Load, Cooling & Airflow CalculatorConvert an equipment schedule and room loads into altitude-corrected sensible cooling, airflow, heat density and N+1 checks.Calculators
  25. AV UPS Sizing, Runtime & Redundancy CalculatorSize UPS VA, watts and ideal battery energy from a load schedule, then test N, N+1, 2N or 2N+1 failure scenarios.Calculators
  26. AVoIP Bandwidth & Switch Capacity PlannerModel video-flow bandwidth, compression, network overhead, redundancy and switch-fabric headroom for AV-over-IP designs.Calculators
  27. BAC CalculatorEstimate blood alcohol content from drinks, weight and time — with clear safety warnings.Calculators
  28. Baking Pan Size ConverterScale a recipe between round and rectangular pans using pan area, depth, volume and an exact ingredient multiplier.Calculators
  29. Battery Backup CalculatorSize backup energy and amp-hour capacity from continuous load, runtime, inverter efficiency and reserve.Calculators
  30. Battery Life CalculatorEstimate runtime from Ah or Wh capacity, voltage, load, efficiency and usable discharge depth.Calculators
  31. Beverage ABV CalculatorEstimate fermentation ABV from gravity readings or calculate a multi-component beverage blend with proof, attenuation, formulas and measurement limits.Calculators
  32. Big Number CalculatorAdd, subtract, multiply, exponentiate and find GCD or LCM using exact integers far beyond normal calculator limits.Calculators
  33. Bill SplitterSplit a restaurant bill with tip and tax evenly, or by what each person ordered.Calculators
  34. BMI CalculatorCalculate your Body Mass Index (BMI) in metric or imperial units and see your weight category.Calculators
  35. Board Foot CalculatorCalculate measured and waste-adjusted board feet, linear feet and lumber cost from actual stock dimensions.Calculators
  36. Board Game Score Calculator & TrackerRun individual, team or cooperative score sheets for up to 12 players with templates, turn order, live standings, autosave and exports.Calculators
  37. Body Fat CalculatorEstimate body-fat percentage with the U.S. Navy tape method, then derive fat mass and lean body mass from body weight.Calculators
  38. Body Surface Area (BSA) CalculatorEstimate body surface area in m² with the Mosteller formula from height and weight. Education/reference only.Calculators
  39. Bond Value CalculatorPrice a fixed-rate bond from market yield and calculate current yield, yield to maturity sensitivity and duration.Calculators
  40. Break-even CalculatorFind how many units you must sell to cover costs, from fixed costs, price and variable cost per unit.Calculators
  41. Brick CalculatorEstimate bricks by modular brick-and-joint size, net wall area, courses, waste and unit cost.Calculators
  42. Business Ratios CalculatorTurn an income statement and balance sheet into a clear liquidity, leverage, profitability and efficiency analysis.Calculators
  43. Business Startup Cost CalculatorBuild a launch budget, add contingency, model monthly burn and see how long your opening cash will last.Calculators
  44. Business Valuation CalculatorEstimate enterprise and equity value with DCF, market and adjusted-asset methods, explicit reconciliation, scenarios and sensitivity analysis.Calculators
  45. CAC & LTV CalculatorCalculate customer acquisition cost, lifetime value, the LTV:CAC ratio and payback period.Calculators
  46. CalculatorA fast, simple online calculator with a big keypad, keyboard typing, percent, memory and a history of your answers.Calculators
  47. Calculus & Differential Equations CalculatorDerivatives, integrals, limits, Taylor series and differential equations solved step by step, with every rule explained and a graph.Calculators
  48. Calorie Calculator (TDEE)Estimate your daily calorie needs (TDEE & BMR) and targets to lose, maintain or gain weight.Calculators
  49. Calories Burned CalculatorEstimate 30 activities by MET value or build a level-walking estimate from steps or distance, time, height and measured step length.Calculators
  50. Calories Per Serving CalculatorBuild a recipe calorie ledger, divide the complete batch by its actual yield and calculate portion weight and calorie density.Calculators
  51. Camera DORI Distance & Pixel Density CalculatorEstimate detect, observe, recognize and identify distances from sensor resolution, field of view and optical zoom.Calculators
  52. Capacitor CalculatorSolve capacitor charge, stored energy, AC reactance, RC timing and series or parallel networks in one electronics workbench.Calculators
  53. Car Depreciation CalculatorProject a vehicle's resale-value range from editable age, mileage, condition and depreciation scenarios.Calculators
  54. Car Lease CalculatorModel a consumer auto lease from adjusted capitalized cost, residual value, money factor, taxes, mileage and end fees.Calculators
  55. Carbon Footprint CalculatorBuild an annual emissions ledger from transparent, versioned and editable home-energy and travel factors.Calculators
  56. Card Draw Probability CalculatorExact hypergeometric odds of drawing your key cards — deck size, copies and draws in, a full exactly / at-least table out.Calculators
  57. Card Pull Probability CalculatorModel sealed-pack odds across loose packs, hobby boxes and cases for sports cards, Pokémon and other trading-card products.Calculators
  58. CD CalculatorCalculate CD, money market and high-yield savings earnings — APY growth broken down by year.Calculators
  59. Child Height PredictorPredict a child's adult height from the parents' heights using the mid-parental method.Calculators
  60. Closing Cost CalculatorEstimate everything you'll pay at closing when buying a home — lender fees, title insurance, transfer taxes by state, prepaids and escrow — plus your total cash to close.Calculators
  61. Coffee To Water Ratio CalculatorBuild a repeatable coffee recipe by mass from water, coffee dose and brew ratio.Calculators
  62. College Savings CalculatorProject inflation-adjusted education costs and the monthly savings needed after grants, existing funds and investment growth.Calculators
  63. Commission CalculatorSeparate standard and accelerated commission and combine it with base compensation.Calculators
  64. Compound Interest CalculatorSee how savings or investments grow over time with compound interest and optional monthly contributions.Calculators
  65. Concrete Block CalculatorBuild a masonry takeoff from wall dimensions, openings, block face size, waste, mortar coverage and material prices.Calculators
  66. Concrete CalculatorEstimate ready-mix cubic yards and common dry-bag equivalents for rectangular slabs, circular slabs and round columns.Calculators
  67. Confidence Interval CalculatorCalculate a two-sided normal confidence interval for a mean with a transparent formula trace.Calculators
  68. Cooking Measurement ConverterConvert US, Imperial and metric kitchen volumes without confusing volume and ingredient mass.Calculators
  69. Correlation CalculatorCalculate Pearson and Spearman correlation from paired data with a scatter plot, tie-aware ranks, interpretation and PDF or CSV export.Calculators
  70. Countdown Day ClockLive countdown to Christmas, Halloween, Thanksgiving and more — or any date you pick — down to the second.Calculators
  71. Countdown TimerSet a custom hours/minutes/seconds timer or count down to a date — with a big display you can pop out into a resizable window and scale full-screen.Calculators
  72. Creatinine Clearance Calculator (Cockcroft-Gault)Estimate creatinine clearance / GFR with the Cockcroft-Gault equation from age, weight and serum creatinine. Education/reference only.Calculators
  73. Creator Revenue & Sponsorship Rate PlannerBuild itemized brand-deal quotes, podcast inventory models and YouTube revenue plans with take-home estimates.Calculators
  74. Credit Card Payoff CalculatorSee how long it takes to clear a credit card balance, or the payment needed to pay it off by a date.Calculators
  75. Crypto ConverterConvert between 100 cryptocurrencies and 12 fiat currencies with live, always-current rates.Calculators
  76. Cups to Grams ConverterConvert recipe volumes and weights with ingredient-specific densities, US or metric cups, custom ingredients and batch scaling.Calculators
  77. Currency ConverterConvert between 40+ world currencies using live exchange rates that update daily.Calculators
  78. Data Size ConverterConvert between bytes, KB, MB, GB, TB and PB using binary units.Calculators
  79. Date CalculatorAdd or subtract years, months, weeks and days from any date to find a future or past date.Calculators
  80. Debt Payoff Vs. Invest CalculatorCompare guaranteed interest savings with after-tax, risk-adjusted investment outcomes over the same time horizon.Calculators
  81. Debt Snowball & Avalanche CalculatorList every debt, add your extra monthly payment and compare snowball and avalanche payoff plans month by month.Calculators
  82. Debt-to-Income Ratio CalculatorCalculate your debt-to-income (DTI) ratio from your monthly debt payments and gross income.Calculators
  83. Deck Material CalculatorEstimate deck-board courses, stock boards, linear feet and face fasteners from actual board layout.Calculators
  84. Density CalculatorSolve density, mass or volume with laboratory and everyday units on one auditable worksheet.Calculators
  85. Density ConverterConvert density across laboratory, material, metric and customary mass-per-volume units.Calculators
  86. Dilution CalculatorSolve any term in M1V1 = M2V2 and turn the result into a stock aliquot and diluent preparation card.Calculators
  87. Dimensional Weight CalculatorCompare actual and dimensional shipping weight with an editable carrier divisor.Calculators
  88. Direct-View LED Pixel Pitch & Resolution CalculatorSize dvLED pixel pitch, module counts, canvas resolution and spares from dimensions and closest viewing distance.Calculators
  89. Discount CalculatorFind the sale price and how much you save from an original price and a percentage off.Calculators
  90. Display Brightness & Ambient Contrast CalculatorEstimate required display luminance from room illumination, screen reflectance, contrast target and design margin.Calculators
  91. Display Size & Content Legibility CalculatorCalculate required display dimensions, viewing angles and minimum character height for room geometry and content tasks.Calculators
  92. Display Viewing Angle & Sightline CalculatorCheck horizontal and vertical image angles, off-axis viewing and screen elevation for near and far seats.Calculators
  93. Dough Hydration CalculatorCalculate true baker's percentages with starter flour and water included, then adjust hydration and portion the finished dough.Calculators
  94. Down Payment CalculatorWork out your home down payment and the loan amount from the price and a percentage down.Calculators
  95. Download & Upload Time CalculatorHow long a file takes to download or upload at any connection speed — with the Mbps vs MB/s confusion sorted out for you.Calculators
  96. Driving Range CalculatorEstimate usable gas or EV range, reserve, condition loss, route margin, required capacity and likely refueling or charging stops.Calculators
  97. Drywall CalculatorEstimate 4-foot drywall sheets for room walls and an optional ceiling after openings and waste.Calculators
  98. DSP I/O, AEC, Gain & Latency PlannerPlan reserved I/O, AEC and matrix capacity with explicit signal-stage gain and additive end-to-end latency assumptions.Calculators
  99. eDPI CalculatorCalculate effective DPI and preserve the same in-game sensitivity when changing mouse DPI.Calculators
  100. Electrical Load Calculator & ScheduleBuild an auditable service, dwelling or branch-circuit load schedule with explicit demand, duty, reserve and phase assumptions.Calculators
  101. Electrical Power, kVA & Amps ConverterConvert W, kW, VA and kVA through power factor, then estimate current for DC, single-phase or balanced three-phase systems.Calculators
  102. Electricity Cost CalculatorSee what any appliance costs to run per day, month and year — with common presets.Calculators
  103. Emergency Fund CalculatorSet a risk-adjusted cash reserve from essential expenses, income stability, dependents, insurance and existing liquid savings.Calculators
  104. Energy ConverterConvert joules, watt-hours, calories, BTU, foot-pounds and electronvolts with clear unit definitions.Calculators
  105. Equipment Lease Vs. Buy CalculatorCompare the after-tax present cost of leasing equipment with financing a purchase, including residual value and opportunity cost.Calculators
  106. EV Charging Cost And Time CalculatorEstimate charging time, grid energy, session cost and range added from vehicle and charger specifications.Calculators
  107. Fair Rent Split CalculatorDivide a fixed total rent among unequal rooms so every roommate prefers their assigned room at its price.Calculators
  108. Fasting TimerRun a persistent wall-clock fasting schedule with flexible targets, a completion chime and private local history.Calculators
  109. Feels-Like Temperature CalculatorWind chill, heat index and dew point — what the temperature really feels like.Calculators
  110. Fence CalculatorEstimate fence sections, posts, pickets and rails while accounting for gates and spacing.Calculators
  111. Fertilizer CalculatorConvert a soil-test nutrient target and fertilizer grade into product pounds, full bags, applied N–P–K and cost.Calculators
  112. File Transfer CalculatorEstimate real copy time across USB, Thunderbolt, internal drives, DAS, NAS, Ethernet, Wi-Fi and fiber by finding the slowest part of the complete path.Calculators
  113. Film & Video Production Budget & Cost ReportBuild a production cost-code ledger with baseline, working budget, commitments, actuals, ETC, EFC, variance and department rollups.Calculators
  114. Finance & Budget TrackerTrack income, expenses, accounts and category budgets, then build a customizable 50 / 30 / 20 plan with Excel, PDF, CSV and JSON export.Calculators
  115. FIRE CalculatorEstimate your financial-independence number, projected FIRE age and savings requirement with explicit real-return and withdrawal assumptions.Calculators
  116. Flight Time & Arrival CalculatorEstimate airborne and gate-to-gate time from airport coordinates, routing, wind and operations, with local arrival times.Calculators
  117. Flow Rate ConverterConvert volumetric flow across liters, cubic meters, US and Imperial gallons and cubic feet.Calculators
  118. Force CalculatorSolve force, mass or acceleration using Newton's second law with unit-aware measurements.Calculators
  119. Force ConverterConvert newtons, pound-force, kilogram-force, ounce-force, dynes and poundals without mixing mass and force.Calculators
  120. Fraction CalculatorAdd, subtract, multiply and divide whole, mixed and improper fractions with exact simplification and worked steps.Calculators
  121. Freelance Rate CalculatorCalculate sustainable hourly and day rates from take-home goals, costs, taxes and realistic billable capacity.Calculators
  122. Frequency ConverterConvert hertz, metric frequency, RPM, BPM and angular frequency in radians per second.Calculators
  123. Frequency To Wavelength CalculatorConvert frequency to wavelength using an editable propagation speed or a common medium preset.Calculators
  124. Fuel Cost CalculatorWork out what a road trip will cost in gas, per mile and per person.Calculators
  125. Fuel Economy ConverterConvert US MPG, Imperial MPG, L/100 km and kilometers per liter correctly.Calculators
  126. Gacha Probability CalculatorHow likely is the banner character in your planned pulls? Flat-rate odds with hard pity, plus pull counts for 50–99% confidence.Calculators
  127. Gaming FOV ConverterConvert horizontal and vertical field of view across display aspect ratios with Hor+ or horizontal-preserving policies.Calculators
  128. Gaming Sensitivity ConverterMatch physical mouse travel across DPI and game rotation scales with an auditable cm-per-360 calibration.Calculators
  129. Gas Mileage (MPG) CalculatorCalculate your real-world MPG from miles driven and gallons used, with metric equivalents.Calculators
  130. Generator Size CalculatorEstimate generator running and motor-starting capacity with editable headroom.Calculators
  131. GPA CalculatorCalculate a credit-weighted GPA with 4.0, 4.33, 5.0 weighted or fully custom grade-point scales.Calculators
  132. Grade CalculatorCalculate a weighted course grade and solve the score needed on remaining assignments or a final exam.Calculators
  133. Graphing CalculatorGraph functions, polar curves, parametric curves and points with sliders, roots, minimums, maximums, intersections and a table of values.Calculators
  134. Gravel CalculatorConvert area and compacted depth into cubic yards, supplier-adjusted tons and material cost.Calculators
  135. Great-Circle Distance & Radius Map PlannerMeasure multi-stop great-circle routes, initial bearings and radius coverage on a world map. Add coordinates, reorder waypoints and export GeoJSON.Calculators
  136. Half-Life CalculatorModel exponential decay, remaining quantity, decayed quantity and the number of half-lives elapsed.Calculators
  137. High Yield Savings Calculator & Growth PlannerProject a high-yield savings balance month by month, compare reinvested and paid-out interest, and export a full growth ledger.Calculators
  138. Hours And Minutes CalculatorAdd or subtract two durations and view clock, decimal-hour, minute and second totals.Calculators
  139. Hours To Decimal ConverterConvert clock hours, minutes and seconds to decimal hours, or convert decimal hours back.Calculators
  140. House Affordability CalculatorSee how much house you can afford with the 28/36 rule, from income, debts and down payment.Calculators
  141. HVAC BTU CalculatorBuild a transparent preliminary cooling-load estimate from area and editable adjustment factors.Calculators
  142. Ideal Gas Law CalculatorSolve pressure, volume, amount or temperature with explicit SI conversion and the ideal gas constant.Calculators
  143. Ideal Weight CalculatorSee your ideal body weight by four medical formulas plus the healthy BMI range.Calculators
  144. Inflation CalculatorConvert dollars between any two years with real U.S. CPI data, or project inflation forward and backward at a flat rate.Calculators
  145. Instagram & TikTok Engagement Rate CalculatorCalculate Instagram or TikTok interactions against followers, reach, impressions or video views.Calculators
  146. Insulation CalculatorEstimate added R-value, layers, coverage, package count and material cost for an editable wall, floor or attic assembly.Calculators
  147. Inventory Planning Calculator (EOQ & Reorder Point)Calculate economic order quantity, reorder point, safety stock context, order cadence and relevant annual inventory cost.Calculators
  148. Inventory Turnover CalculatorMeasure inventory turns, days on hand, sales-to-inventory and GMROI from beginning and ending inventory.Calculators
  149. Investment Return CalculatorProject recurring investments with expected return, fees, inflation and purchasing-power results.Calculators
  150. IV Drip Rate CalculatorCalculate IV infusion drip rate in gtt/min and pump rate in mL/hr from volume, time and drop factor. Education/reference only.Calculators
  151. Kinetic Energy CalculatorSolve kinetic energy, mass or speed and expose the effect of the squared velocity term.Calculators
  152. Lawn Seed CalculatorPlan seed weight, bag count, overage and cost from lawn area, application rate, waste and retail bag size.Calculators
  153. LED Resistor CalculatorCalculate series resistance, dissipation and a conservative resistor power rating for an LED string.Calculators
  154. Length & Distance ConverterConvert length and distance — mm, cm, m, km, inches, feet, miles, nautical miles, light years and parsecs.Calculators
  155. Lens Focal Length & Field of View CalculatorField of view for any lens on 30+ sensors — ARRI, RED, Sony, Canon, Blackmagic, full frame, Micro Four Thirds, broadcast and CCTV — plus a reverse mode that finds the focal length you need.Calculators
  156. Lens Formula CalculatorSolve thin-lens focal length, object distance or image distance with magnification and a ray diagram.Calculators
  157. Life Insurance CalculatorWork out how much life insurance coverage your family actually needs with the DIME method.Calculators
  158. Life Path Number CalculatorExplore birth-date numerology with transparent steps, master-number options and a personal-year calendar.Calculators
  159. Linear Regression CalculatorFit an ordinary least-squares line, inspect residuals and R², predict Y values and reveal the calculation steps.Calculators
  160. Live Crypto PricesReal-time price ticker for the top 100 cryptocurrencies — price, 24h and 7d change, market cap and 7-day charts.Calculators
  161. Loan CalculatorEstimate the monthly payment, total interest and total cost of any loan from the amount, rate and term.Calculators
  162. Loan Comparison CalculatorCompare three fixed-rate loans by payment, interest, fees and total cost.Calculators
  163. Logarithm CalculatorCalculate a logarithm in any valid base with natural and common-log references.Calculators
  164. Lottery Tax CalculatorSee what you'd actually take home from a jackpot — federal + state taxes, lump sum vs. 30-year annuity, year by year.Calculators
  165. Love CalculatorEnter two names and get your love compatibility score — just for fun!Calculators
  166. Love Compatibility CalculatorCheck zodiac love compatibility between two signs or birthdays, with real astrology rules behind the score.Calculators
  167. Lumber CalculatorConvert required linear footage into whole stock boards, purchased length and cost.Calculators
  168. Macro CalculatorTurn your daily calories into protein, carb and fat gram targets for any diet style.Calculators
  169. Margin & Markup CalculatorCalculate gross profit, profit margin and markup from a product's cost and selling price.Calculators
  170. Margin Of Error CalculatorEstimate normal-theory margin of error for a mean or survey proportion.Calculators
  171. Marketplace & Payment Fee CalculatorReconcile editable Amazon FBA, eBay, Etsy, PayPal, Stripe and TikTok Shop fees against product costs, refunds, fulfillment and target profit.Calculators
  172. Matrix CalculatorCalculate with custom 1×1 through 8×8 square or rectangular matrices, including valid arithmetic, transpose, inverse, determinant and RREF.Calculators
  173. Mean Arterial Pressure (MAP) CalculatorCalculate mean arterial pressure from systolic and diastolic blood pressure. Education/reference only.Calculators
  174. Medication Dosage Calculator (mg/kg)Weight-based dose calculator: total mg from mg/kg and patient weight, plus volume to draw from a concentration. Education/reference only.Calculators
  175. Meeting Cost CalculatorBuild a role-based meeting cost with payroll burden, preparation time, recurrence, participant hours and a live session counter.Calculators
  176. Mileage Reimbursement & Expense CalculatorBuild a dated mileage claim using editable IRS or employer rates, repeated trips, tolls, parking and actual-expense comparison.Calculators
  177. Military Time ConverterConvert between 12-hour, 24-hour and four-digit military time, including midnight, noon, pronunciation and optional zone letters.Calculators
  178. Minecraft Nether Coordinate CalculatorConvert Overworld and Nether X/Z coordinates at the correct 8:1 ratio, with chunks and a copyable teleport command.Calculators
  179. Modulo CalculatorCompare Euclidean modulo with truncated language-style remainders, including negative dividends and divisors.Calculators
  180. Molar Mass CalculatorParse nested chemical formulas and hydrates into an auditable element-by-element molar-mass and composition ledger.Calculators
  181. Molarity CalculatorSolve concentration, solute moles or final solution volume with explicit milliliter and liter handling.Calculators
  182. Mortgage CalculatorEstimate your monthly mortgage payment from home price, down payment, rate and term — plus taxes, insurance and HOA.Calculators
  183. Mortgage Comparison CalculatorCompare two home prices, mortgage rates, down payments and loan terms side by side — including monthly, upfront and long-term costs.Calculators
  184. Mortgage Extra Payment CalculatorModel recurring, delayed, annual and one-time principal payments against the exact years remaining on your mortgage.Calculators
  185. Moving Box CalculatorA packing shopping list from your home size — small, medium, large, wardrobe and dish boxes plus tape and paper.Calculators
  186. Moving Truck CalculatorWhich rental truck fits your move — load size from home and furnishings, a 10% buffer, and trips needed.Calculators
  187. Mulch CalculatorEstimate cubic yards and retail bags from bed area, depth, waste, bag size and price.Calculators
  188. Name Numerology & Personal Year StudioInspect letter values, expression, soul-urge and personality numbers with optional birth-date cycles.Calculators
  189. Net Worth CalculatorAdd up your assets and subtract your debts to calculate your total net worth.Calculators
  190. Number Sequence CalculatorDetect transparent arithmetic, geometric or previous-two-term patterns and project up to twenty additional terms.Calculators
  191. Ohm's Law CalculatorEnter any two of voltage, current, resistance or power — get the other two instantly.Calculators
  192. One Rep Max CalculatorEstimate your 1RM from any set, with training percentages for programming.Calculators
  193. Online RulerCalibrate your display, measure between two markers and open a synchronized pop-out or true full-screen ruler.Calculators
  194. Oven Temperature ConverterConvert Fahrenheit, Celsius, fan-assisted settings and UK gas marks, then build an adjustable oven-to-air-fryer time and temperature plan.Calculators
  195. Overtime CalculatorSeparate regular, overtime and optional double-time hours with editable thresholds and multipliers.Calculators
  196. Ovulation CalculatorEstimate your ovulation date, fertile window, next period and potential due date from your cycle.Calculators
  197. P-Value CalculatorCalculate exact tail probabilities, critical values and significance decisions for z, Student t, chi-square and F statistics.Calculators
  198. Pace CalculatorCalculate running pace per mile and kilometer, plus speed, from your distance and time.Calculators
  199. Paint CalculatorEstimate multi-coat wall and ceiling paint after standard door and window deductions, coverage, waste and cost.Calculators
  200. Percentage CalculatorWork out percentages: X% of Y, X as a percent of Y, and percent change between two numbers.Calculators
  201. Percentage Difference CalculatorCompare two values symmetrically and see both directional percentage changes side by side.Calculators
  202. Permutation & Combination CalculatorCalculate nPr, nCr and factorials — ordered and unordered selections from n items.Calculators
  203. Pet Age CalculatorConvert your dog's or cat's age into human years — size-adjusted, not the old times-7 myth.Calculators
  204. pH CalculatorConvert among pH, pOH, hydrogen ion concentration and hydroxide ion concentration with editable pKw.Calculators
  205. PoE Switch Power Budget & Redundancy CalculatorBudget class-allocated or measured device loads, cable loss, ports, switch capacity, heat and one-power-supply-failed operation.Calculators
  206. Pomodoro TimerRun focus sessions and breaks with configurable lengths, rounds, auto-start, chimes and a live page-title countdown.Calculators
  207. Pool Volume CalculatorEstimate gallons, liters and fill time for rectangular, oval and circular pools using average depth.Calculators
  208. Potential Energy CalculatorSolve gravitational potential energy, mass or height with selectable local gravity.Calculators
  209. Power ConverterConvert watts, kilowatts, horsepower, BTU per hour and other mechanical or thermal power units.Calculators
  210. Pregnancy Due Date CalculatorEstimate your pregnancy due date from your last period, plus how far along you are.Calculators
  211. Pressure ConverterConvert Pa, kPa, bar, psi, atmospheres, Torr and mercury-column units, including tire-pressure guidance.Calculators
  212. Prime Factorization & Number Theory CalculatorCheck prime numbers, calculate prime factorizations, and find the GCF and LCM of a complete number set.Calculators
  213. Probability CalculatorCalculate complements, independent intersections and unions, or conditional probability.Calculators
  214. Projectile Motion CalculatorModel an ideal projectile arc with launch speed, angle, height and selectable gravity.Calculators
  215. Projector Brightness & Throw CalculatorCalculate projection geometry, lens coverage, screen area, foot-lamberts and nits with installation loss and screen gain.Calculators
  216. Proportion CalculatorSolve one missing value in a/b = c/d using exact cross multiplication.Calculators
  217. Protein Intake CalculatorGet a daily protein range in grams from body weight, training level and goal, with a per-meal split.Calculators
  218. Quadratic Equation SolverSolve real or complex roots, inspect the discriminant and vertex, and reveal every substitution step with Show Work.Calculators
  219. RAID Capacity CalculatorCalculate usable NAS, DAS and server storage across RAID, RAIDZ and Synology SHR, including mixed drives, hot spares, overhead, used space and planned upgrades.Calculators
  220. Ratio CalculatorSimplify multi-part whole-number ratios and inspect their shared divisor and decimal relationships.Calculators
  221. Realtor Commission Calculator & Split WorksheetEstimate a real estate agent's commission waterfall through side, referral, brokerage, franchise, team and expense deductions.Calculators
  222. Recurring Revenue Calculator (MRR & ARR)Model plan-level MRR, ARR, net new revenue, ARPU, logo churn, revenue churn and net revenue retention in one operating worksheet.Calculators
  223. Refinance CalculatorCompare your current loan to a refinance to see monthly savings and the break-even point.Calculators
  224. Rent Vs. Buy CalculatorCompare renting and owning across a chosen horizon with transaction costs, maintenance, taxes, appreciation and investment opportunity cost.Calculators
  225. Resin Print Cost CalculatorQuote resin prints from slicer volume, supports, vat waste, failure risk, machine time, labor, consumables and markup.Calculators
  226. Resistor Color Code CalculatorDecode four- and five-band resistor colors into nominal resistance, tolerance and range.Calculators
  227. Retirement CalculatorProject your retirement savings from your age, contributions and expected return — plus estimated retirement income.Calculators
  228. Retirement Withdrawal CalculatorStress-test retirement drawdown with inflation, fees, multiple return scenarios and a visible year-by-year balance path.Calculators
  229. ROAS CalculatorCalculate return on ad spend, ROI and the break-even ROAS for your profit margin.Calculators
  230. ROI CalculatorCalculate return on investment (ROI), net profit and annualized return (CAGR) from an initial and final value.Calculators
  231. Roof Pitch CalculatorConvert rise and run into angle, slope and pitch factor, then estimate gable-rafter length and roofing area.Calculators
  232. Roofing Material CalculatorEstimate waste-adjusted roofing squares, bundles, underlayment rolls and nails.Calculators
  233. Roth IRA CalculatorProject Roth IRA growth with a visible contribution-eligibility gate, shared IRA limits, fees, inflation and after-tax scenario comparisons.Calculators
  234. Rounding CalculatorRound to positive or negative decimal places using nearest, directed or truncation rules.Calculators
  235. Rule of 72 CalculatorEstimate how long it takes an investment to double — or the return needed — using the Rule of 72.Calculators
  236. Salary CalculatorConvert pay between hourly, daily, weekly, monthly and annual based on your hours and weeks worked.Calculators
  237. Sales Tax CalculatorAdd sales tax to a price or work backwards to find the pre-tax amount and the tax included.Calculators
  238. Sample Size CalculatorEstimate completed responses for a proportion with confidence, precision and finite-population correction.Calculators
  239. Savings Goal CalculatorFind out how much to save each month to reach a savings goal by a target date.Calculators
  240. Scientific CalculatorA free online scientific calculator: trig in degrees, radians or gradians, inverse and hyperbolic functions, logs, powers, roots, factorials, nCr, fractions, memory and history.Calculators
  241. Scientific Notation ConverterConvert decimal values into normalized scientific and engineering notation.Calculators
  242. Shoe Size ConverterConvert shoe sizes between US, UK and EU for men, women and kids — plus foot length.Calculators
  243. Shopify Profit CalculatorBuild an editable Shopify profit bridge across refunds, COGS, payment and platform fees, fulfillment, shipping, apps and advertising.Calculators
  244. Show Rundown CreatorBuild a broadcast-style run of show — segments, talent, sources, durations and auto-calculated start times — with a live countdown mode and CSV, Excel and PDF export.Calculators
  245. Significant Figures CalculatorRound a value to a chosen number of significant figures while preserving precision notation.Calculators
  246. Simple Interest CalculatorCalculate simple interest and the total value from a principal, rate and time period.Calculators
  247. Sleep CalculatorFind the best bedtime or wake-up time based on 90-minute sleep cycles.Calculators
  248. SMPTE Timecode Calculator & Drop-Frame ConverterInspect, offset, compare and convert SMPTE-style timecodes across common drop-frame and non-drop frame rates.Calculators
  249. Soil CalculatorEstimate measured and settlement-adjusted soil volume in cubic yards and retail bags.Calculators
  250. Solar Panel CalculatorEstimate array size, panel count and roof area from energy use, sun hours and system efficiency.Calculators
  251. Speaker Coverage, SPL, Amplifier & Surround PlannerDesign distributed coverage and target SPL, size amplifier channels, or build a preliminary surround-speaker coordinate and delay schedule.Calculators
  252. Speaker, RF & SDI Cable Engineering CalculatorRecommend speaker conductors and compare delivered power, or model RF/SDI coax attenuation and remaining link margin with mode-specific controls.Calculators
  253. Speed ConverterConvert speed — m/s, km/h, mph, feet per second, knots and Mach.Calculators
  254. Square Footage CalculatorBuild a multi-room area schedule with shapes, cutouts, quantities, waste, material coverage, box counts and project cost.Calculators
  255. Square Root CalculatorCalculate real or imaginary square roots, simplify whole-number radicals and reveal the work step by step.Calculators
  256. Stair CalculatorCalculate riser count and height, treads, total run and geometric stringer length.Calculators
  257. Statistics CalculatorGet mean, median, mode, range, variance and standard deviation from a list of numbers.Calculators
  258. Stoichiometry CalculatorAudit a user-balanced reaction, identify limiting reactants and excess material, and calculate theoretical and percent yields in grams or moles.Calculators
  259. StopwatchA precise online stopwatch with lap times, fastest/slowest highlighting, full-screen mode and a pop-out window that scales to any size.Calculators
  260. Streaming Bitrate CalculatorThe right bitrate and encoder settings for Twitch, YouTube or Kick — x264, NVENC, HEVC and AV1 compared, with a quality verdict and suggested OBS settings.Calculators
  261. Student Loan CalculatorCalculate student loan payments and see how much extra payments save in time and interest.Calculators
  262. Study Time Calculator & PlannerAllocate study time by deadline and difficulty, place recommended sessions on a monthly calendar and run focused blocks with the built-in timer.Calculators
  263. System of Equations SolverSolve linear systems with two to eight custom-named unknowns and distinguish unique, dependent and inconsistent results with elimination steps.Calculators
  264. Take-Home Pay CalculatorEstimate your net paycheck after taxes, FICA and pre-tax deductions from your gross salary.Calculators
  265. Target Heart Rate CalculatorFind your five training heart-rate zones with the Karvonen method.Calculators
  266. Temperature ConverterConvert temperature between Celsius, Fahrenheit, Kelvin and Rankine.Calculators
  267. Test Score CalculatorUse the standard grading scale or customize bands, assessment weight, partial credit and rounding.Calculators
  268. Tile CalculatorEstimate tiles and full boxes from net surface area, actual tile size, grout joint, waste, box count and cost.Calculators
  269. Time CalculatorAdd or subtract hours, minutes and seconds, or find the duration between two dates and times.Calculators
  270. Time ConverterConvert between seconds, minutes, hours, days, weeks, months and years instantly.Calculators
  271. Time Zone CalculatorConvert a specific date and time from one time zone to another, with daylight saving handled.Calculators
  272. Time Zone ConverterSee a chosen time across major world time zones at a glance.Calculators
  273. Timecard CalculatorAdd up weekly work hours from clock-in/out times with breaks, and calculate pay from an hourly rate.Calculators
  274. Tip CalculatorWork out the tip and total for a bill, and split it evenly between any number of people.Calculators
  275. Tire Size Comparison CalculatorCompare tire diameter, sidewall, clearance, revolutions and speedometer effect.Calculators
  276. Torque ConverterConvert N·m, kgf·m, lbf·ft, lbf·in and other torque units with force and lever arm kept explicit.Calculators
  277. Total Compensation CalculatorCompare salary, bonus, annualized signing pay, employer benefits, employee costs and risk-adjusted equity on annual and effective-hourly bases.Calculators
  278. Travel Budget CalculatorBuild a per-trip, per-day and per-traveler expense ledger with contingency, paid amounts and funding targets.Calculators
  279. Triangle & Circle Geometry StudioCalculate triangle angles, area and radii or circle dimensions with proportional diagrams and exportable results.Calculators
  280. Trip Cost CalculatorBuild a transparent travel budget from driving, toll, parking, lodging, meal and traveler inputs.Calculators
  281. True Country Size Comparison MapDrag and rotate countries to compare real sizes, explore U.S. state boundaries as you zoom, switch projections and share your geography comparisons.Calculators
  282. Turkey Thawing Time PlannerWork backward from cooking time with USDA refrigerator, cold-water or manufacturer-directed microwave thawing schedules and safety steps.Calculators
  283. Twitch Bits To USD CalculatorEstimate creator revenue from Bits with an editable per-Bit payout assumption.Calculators
  284. Unit ConverterConvert length, weight, volume and temperature between common units.Calculators
  285. Unit Price Calculator & Grocery ComparisonCompare pack sizes, multipacks, discounts and usable quantities to find the lowest price per unit.Calculators
  286. VAT CalculatorAdd or remove VAT at any rate — see the net, VAT amount and gross total instantly.Calculators
  287. Velocity CalculatorCalculate average velocity from distance and elapsed time, then compare meters per second, km/h, mph and knots.Calculators
  288. Video Formats & Data Rate CalculatorRecording data rates and card-fill times for ProRes, ProRes RAW, ARRIRAW, REDCODE R3D, Blackmagic BRAW, Sony XAVC & X-OCN, Canon RAW, DNx, H.264/H.265 — any resolution and frame rate.Calculators
  289. Video Production CalculatorOne flow for a whole shoot — camera + lens + aperture + codec + resolution give you field of view, depth of field, storage, card count and offload time together.Calculators
  290. Video Wall Designer & Controller PlannerBuild panel arrays, account for bezels, calculate canvas resolution and size the controller output and pixel capacity in one workspace.Calculators
  291. VO2 Max CalculatorEstimate aerobic capacity from a Cooper 12-minute run or Rockport one-mile walk with method-specific validation.Calculators
  292. Voltage Divider CalculatorCalculate loaded or unloaded resistive-divider output, current and resistor dissipation.Calculators
  293. Voltage Drop CalculatorEstimate copper-conductor voltage drop for DC, single-phase and balanced three-phase circuits.Calculators
  294. Volume ConverterConvert volume — milliliters, liters, cups, teaspoons, tablespoons, fluid ounces, pints, quarts and gallons.Calculators
  295. Waist-To-Height Ratio CalculatorCompare waist with height on a clear 0.5 reference rail using NICE central-adiposity guidance.Calculators
  296. Wallpaper CalculatorHow many rolls to buy — strip-based math with roll size, pattern repeat and a waste allowance, in feet or meters.Calculators
  297. Water Intake CalculatorEstimate a daily water target from body weight, exercise, climate and pregnancy or breastfeeding status.Calculators
  298. Watts Volts Amps CalculatorLeave exactly one power-triangle value blank to solve watts, volts or amps.Calculators
  299. Wave Speed CalculatorSolve wave speed, frequency or wavelength and inspect the relationship on a compact waveform scope.Calculators
  300. Weight & Mass ConverterConvert weight and mass — milligrams, grams, kilograms, tonnes, ounces, pounds, stones and tons.Calculators
  301. Weight Loss Timeline CalculatorMap a gradual weekly weight-change assumption to milestone dates while keeping uncertainty explicit.Calculators
  302. Weighted Average CalculatorBuild an editable weighted-value table and calculate the normalized average, weighted sum and total coverage.Calculators
  303. What If I Invested CalculatorSee what $1,000 in Apple, Bitcoin, Tesla or the S&P 500 bought in any year would be worth today — with yearly growth chart and S&P comparison.Calculators
  304. Wi-Fi Coverage, Capacity & AP Count PlannerCompare per-band RF coverage, SNR, client capacity, channel reuse, wired uplinks and PoE to estimate a survey-ready AP plan.Calculators
  305. Wire Size & Voltage Drop PlannerCompare copper and aluminum conductor candidates using ampacity, voltage drop, termination, conductor-count and operating-cost screens.Calculators
  306. Work CalculatorSolve work, force or distance with force angle and optional average power.Calculators
  307. Working Days CalculatorCount workdays between dates with editable weekends, holidays and endpoint rules.Calculators
  308. Z-Score CalculatorStandardize a value by its distance from a mean in standard-deviation units.Calculators
  309. Zodiac Sign CalculatorFind your astrological sign from your birthday — element, ruling planet, traits and your Chinese zodiac too.Calculators