Half-Life Calculator
Calculate radioactive decay or exponential half-life decay. Find the remaining amount after a given time.
How to Use the Half-Life Calculator
- Enter the initial amount of the substance.
- Enter the half-life period (in the same time units).
- Enter the elapsed time and click Calculate.
Riferimento Rapido
| Da | A |
|---|---|
| 1 half-life | 50% remains |
| 2 half-lives | 25% remains |
| 3 half-lives | 12.5% remains |
| 5 half-lives | 3.125% remains |
| 10 half-lives | 0.098% remains |
Casi d'Uso
- •Calculating radioactive decay in physics problems.
- •Determining drug concentration after a given time.
- •Modeling depreciation using half-life decay.
Formula
N = N₀ × (1/2)^(t/t½). After each half-life, half the material remains.
Domande Frequenti
What is half-life?
The time required for half of a substance to decay or be eliminated.
Does this apply only to radioactivity?
No. Half-life applies to drug metabolism, chemical reactions, and any exponential decay process.
How many half-lives until nothing remains?
Theoretically never zero, but after 10 half-lives less than 0.1% remains.