Drop odds
A 1-in-N chance over some attempts. Type the N from any ore, drop or rune page.
Chance of at least one in 100 attempts
3.28%
| Target | Attempts needed |
|---|---|
| 50.0% | 2,082 |
| 90.0% | 6,914 |
| 99.0% | 13,828 |
P(at least one) = 1 − (1 − 1/N)a; attempts for a target t = ⌈ln(1 − t) ÷ ln(1 − 1/N)⌉. Plain probability, no game assumptions.