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

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MyCalcBuddy Editorial Team

This page is maintained as an educational calculator reference.

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Formula Source: University Physics

by Young & Freedman

ðŸ”„Last reviewed: May 2026

âœ“Formula checks are based on standard references and internal QA review.