Half-Life Calculator
Solve half-life problems for radioactive decay and exponential processes. Find the remaining quantity after a given time, or determine the half-life from initial and final amounts.
Inputs
Results
Remaining
25.00
% Remaining
25.00%
Half-Lives
2.00
Half-Life Results
| Parameter | Value |
|---|---|
| Initial Amount | 100 |
| Remaining Amount | 25 |
| Percent Remaining | 25.0000% |
| Amount Decayed | 75 |
| Half-Life | 5,730 |
| Time Elapsed | 11,460 |
| Half-Lives Elapsed | 2.0000 |
| Decay Constant (λ) | 1.209681e-4 |
| Mean Lifetime (τ) | 8,266.6426 |
| Formula | N(t) = N₀ × (½)^(t/t₁/₂) |