Half-Life Calculator
Remaining amount equals starting amount multiplied by one-half raised to elapsed time divided by half-life.
This calculator is free to use. Enable JavaScript to enter your values and see a result instantly.
How it works
Remaining amount equals starting amount multiplied by one-half raised to elapsed time divided by half-life.
Worked example
After two half-lives, one quarter remains.
Keep in mind
Results are estimates; check the assumptions for your situation.