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Half-Life Calculator

Calculate exponential decay with a constant half-life.

How It Works

Remaining=initial×2^(−elapsed/half-life). Both time inputs must use the same unit.

Reference Sources

FAQs

How does this calculator work?

Remaining=initial×2^(−elapsed/half-life). Both time inputs must use the same unit.

What assumptions should I check?

Check the units and definitions shown beside each input. Results use the values you enter.