Half-Life & Radioactive Decay Calculator

Decay amounts · Half-life finder · Decay series · Isotope reference

N(t) = N₀ × (1/2)^(t / t½)
e.g. grams, atoms, Bq
Remaining25.00%
RemainingDecayed
Remaining Amount
25
grams
% Remaining
25.00%
Amount Decayed
75
grams
Half-Lives Elapsed
2
Decay Constant (λ)
3.8332e-12 s⁻¹
Mean Lifetime (τ)
8.267 kyr