How it works
Fill in the 3 fields above and Radioactive Decay Calculator calculates the result instantly, recalculating as you change any value. It applies the formula N = N₀ · (½)^(t/t½). The math runs locally in your browser — nothing is sent to a server.
Formula
N = N₀ · (½)^(t/t½)Examples
- Initial amount 100, Half-life 5 units, Elapsed time 12 units → Remaining: 18.95
Frequently asked questions
How do I use the Radioactive Decay Calculator?
Enter your values in the 3 input fields and the result is calculated automatically as you type. Change any value to see the numbers update instantly.
What formula does the Radioactive Decay Calculator use?
It uses N = N₀ · (½)^(t/t½). The calculation is performed in your browser using standard, well-established math for accurate results.
Is my data private?
Yes. The Radioactive Decay Calculator runs entirely in your browser. Nothing you enter is uploaded, saved to a server, or shared — it never leaves your device.
Is the Radioactive Decay Calculator free?
Yes, it is completely free with no sign-up, no limits and no watermarks. Like every tool on science and the rest of the platform, you can use it as often as you like.
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