// multi-utility computation suite · offline · instant · precise
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sci.half-life Calculator
Calculates radioactive half-life, decay constant (λ = ln2/t½), and remaining activity from initial activity and elapsed time. After 10 half-lives, only 0.1% of the original radioactive material remains — carbon-14 (t½ = 5,730 years) dates materials up to ~50,000 years old.
Inputs
N0
Count or number of items involved.
T12
Reference formula or conversion factor shown for context.
T
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Unit
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Results
remaining quantity
Sample size or count used in the calculation.
% remaining
Sample size or count used in the calculation.
% decayed
Reference formula or conversion factor shown for context.
decay constant λ
Sample size or count used in the calculation.
mean lifetime τ
Arithmetic average — sum divided by count. Simple and familiar, but pulled by outliers. If your data contains extreme values, the median may be more representative.