Half-Life Calculator
Amount remaining
25 units of initial amount
- Fraction remaining
- 25%
- Amount decayed
- 75
- Half-lives elapsed
- 2
- Decay constant λ
- 1.2097e-4 per year
- Mean lifetime τ
- 8,266.64 years
Decay by half-life11 rows
| Half-lives | Time | Remaining | Percent |
|---|---|---|---|
| 0 | 0 years | 100 | 100% |
| 1 | 5,730 years | 50 | 50% |
| 2 | 11,460 years | 25 | 25% |
| 3 | 17,190 years | 12.5 | 12.5% |
| 4 | 22,920 years | 6.25 | 6.25% |
| 5 | 28,650 years | 3.125 | 3.125% |
| 6 | 34,380 years | 1.5625 | 1.563% |
| 7 | 40,110 years | 0.7813 | 0.781% |
| 8 | 45,840 years | 0.3906 | 0.391% |
| 9 | 51,570 years | 0.1953 | 0.195% |
| 10 | 57,300 years | 0.0977 | 0.098% |