Half Life Calculator

Half-life is the time required for half of a substance to undergo decay or be eliminated. It applies to radioactive decay, drug metabolism, and chemical reactions. After n half-lives, the remaining fraction is (1/2)ⁿ.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

1. 1Remaining quantity: N(t) = N₀ × (1/2)^(t/t½)
2. 2N₀ = initial amount, t = elapsed time, t½ = half-life
3. 3Equivalently: N(t) = N₀ × e^(−λt) where λ = ln(2)/t½
4. 4After 10 half-lives: only ~0.1% of the original remains