Given a half-life (h) of a substance at time t, this determines the new substance size at time t_{n}, otherwise known as decay.

This calculator has 4 inputs.

This calculator has 4 inputs.

- Δ = t
_{n}- t - Number of half lives = Δ/half life
- Half Life Remaining = 1/2 * Prior Amount

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- decay
- Reduction in size from decomposition
- exponent
- The power to raise a number
- half-life
- time required for a quantity to reduce to half its initial value
- substance