Is the One Rep Max Calculator free to use?

Yes. Every tool on the site is completely free, with no account, login or download required.

Most tools process content on your device. Features using live data, external services or sharing make network requests. Review the tool's instructions and our Privacy Policy before using sensitive information.

Does it work on mobile?

The layout adapts to phones, tablets and desktops. Available file formats, device access and larger processing jobs depend on your browser and device.

Do I need to install anything?

No installation is needed to use the website. The optional browser extension and mobile app are currently in development.

One Rep Max Calculator

Estimate your 1RM from any set, with training percentages for programming.

Weight LiftedUnitReps Performed (1–15)

Estimated 1RM

212 lb

average of Epley & Brzycki

216 lb

Epley Formula

208 lb

Brzycki Formula

Training Percentages

% of 1RM	Weight	Typical Use
95%	201 lb	strength (1–3 reps)
90%	191 lb	strength (1–3 reps)
85%	180 lb	strength (3–6 reps)
80%	170 lb	strength (3–6 reps)
75%	159 lb	hypertrophy (6–12 reps)
70%	148 lb	hypertrophy (6–12 reps)
65%	138 lb	endurance (12+ reps)
60%	127 lb	endurance (12+ reps)

DISCLAIMER: 1RM estimates get less accurate above ~10 reps. Always test true maxes with a spotter and proper warm-up. Not medical advice.

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What Is the One Rep Max Calculator?

The One Rep Max Calculator lets you estimate your 1RM from any set, with training percentages for programming. Open the workspace above to use its controls. No account or installation is required.

How It Works

Enter the values or content requested by the One Rep Max Calculator, choose the available options, and review the result. Where a tool offers a download or copy control, use it to keep your work. Live data, remote resources and some device features require an internet connection or browser permission.

When to Use It

Use the One Rep Max Calculator to estimate your 1RM from any set, with training percentages for programming. Explore related calculators for the next step in your workflow. Check units, source values and any stated limitations before relying on a result.

Frequently Asked Questions

Is the One Rep Max Calculator free to use?: Yes. Every tool on the site is completely free, with no account, login or download required.
Is my data private?: Most tools process content on your device. Features using live data, external services or sharing make network requests. Review the tool's instructions and our Privacy Policy before using sensitive information.
Does it work on mobile?: The layout adapts to phones, tablets and desktops. Available file formats, device access and larger processing jobs depend on your browser and device.
Do I need to install anything?: No installation is needed to use the website. The optional browser extension and mobile app are currently in development.

Found an issue? Send Feedback. See our data sources and update policy for tools that depend on changing information.