Formulas
- N(t) = N₀ × (½)t / T½
- Decay constant: λ = ln(2) / T½
- Mean lifetime: τ = 1 / λ = T½ / ln(2) ≈ 1.4427 · T½
Used for radioactive decay, drug elimination (pharmacokinetics), capacitor discharge, and any first-order process.
Half-life calculator
Exponential decay: N(t) = N₀ × (½)t / T½. Pick what you want to solve for and fill in the rest.
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Decay constant λ
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