Half-Life Advanced Calculator

Solve for any unknown in radioactive decay calculations

What do you want to find?

Time Unit:

Initial Amount (N₀):

Final Amount (Nt):

Time Elapsed (years):

N(t) = N₀ × (1/2)^(t/t_half)

t = t_half × ln(N₀/Nt) / ln(2)

t_half = t × ln(2) / ln(N₀/Nt)

λ = ln(2) / t_half