FREE ONLINE TOOLFree Half-Life
Free Half-Life
Calculator
Advanced free half-life calculator for exponential decay, decay constants, mean lifetime, activity from sample mass, milestone planning, two-component decay mixtures, plots and CSV export.
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About Free Half-Life Calculator
Solve any half-life variable, convert between half-life, decay constant and mean lifetime, calculate radioactive activity from sample mass, inspect milestones, or model a two-component decay mixture — all locally.
Workspace options
- Solve for
- Initial amount N₀
- Remaining amount N(t)
- Elapsed time t
- Half-life t½
- Amount unit label
Available actions
- ☼ / ◐
- Decay solver
- Constants & milestones
- Activity from sample
- Two-component decay
- 3 half-lives → 12.5%