Free · Math · Science
Half-Life Calculator
Calculate the remaining amount, elapsed half-lives, and decay constant for exponential decay.
- Checked formula
- Private in your browser
- No signup
Result
Your calculation
- Remaining amount
- 12.5
- Amount decayed
- 87.5
- Half-lives elapsed
- 3
- Decay constant
- 0.0866434 per time unit
How to use this calculator
- Enter the known values using the units shown.
- Choose the calculation you want when more than one method is available.
- Calculate, then review the result and the worked formula together.
Private by default
Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.