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Half-life Calculator
Solve radioactive decay or drug half-life for amount left, time or half-life, with a decay curve and isotope presets.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Half-life Calculator works
All maths runs in your browser, instantly, with no account.
Input: Numbers. Output: Text.
How to use Half-life Calculator
- Pick a preset or type the half-life.
- Leave one box empty.
- Read the answer and the curve.
Tips
- Exact fractions are used where rounding would give wrong answers.
- Every tool works offline once the page has loaded.
Half-life Calculator FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
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