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Half-Life Calculator
Calculate how much of a substance remains after a given time from its half-life, or how long until a set amount is left.
Tip from Tink: After 5 half-lives, about 3% remains.
Amount left
29.8292
Percent left
29.829%
Half-lives passed
1.745
Time needed
19,034.65
Default is carbon-14 (half-life 5,730 years), used in carbon dating. Works for medicine doses too.
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How to use the Half-Life Calculator
- Enter the starting amount and half-life.
- Enter the time passed in the same unit.
- Read the amount left.
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