Half-Life Calculator
Model exponential decay, remaining quantity, decayed quantity and the number of half-lives elapsed.
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What Is the Half-Life Calculator?
The Half-Life Calculator applies exponential decay to any consistent quantity and time unit. It reports the amount remaining, amount decayed, remaining percentage and number of half-lives.
How It Works
Enter the initial quantity, one half-life and elapsed time using a consistent time unit. Presets demonstrate common fractional and multiple-half-life intervals.
When to Use It
Use it for science education, isotope-decay exercises and any ideal process that follows a fixed half-life model.
Frequently Asked Questions
- Does The Unit Of Amount Matter?
- No, provided the initial and remaining quantities use the same unit.
- Does A Sample Reach Exactly Zero?
- The ideal exponential model approaches zero continuously but does not reach it at a finite time.
Found an issue? Send Feedback. See our data sources and update policy for tools that depend on changing information.
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