Half-Life Calculator

Remaining quantity after decay.

Input Parameters

Start amount

Half-life

Elapsed time

Calculation Summary

Remaining18.94645708

Decayed81.05354292%

Half-lives elapsed2.40

175 available

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About this calculator

Remaining quantity from start amount, half-life and elapsed time.

Formula?

Start × 0.5^(time ÷ half-life).

Units?

Any — time and half-life just share them.

Never zero?

Mathematically it halves forever; practically it vanishes.