Work backward from a goal
How Many Chests for a Target Chance?
Choose a drop rate and target percentage to calculate the number of independent attempts required.
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Why 50% is not a guarantee
At a 50% cumulative chance, half of many comparable runs would succeed by the calculated attempt count and half would not. A player can still miss after that number or succeed much earlier. Random independent events do not create a deadline where a reward must appear.
Useful target levels
| Target | How to interpret it |
|---|---|
| 1% | A low-probability milestone useful for early progress. |
| 10% | About one success in ten comparable runs. |
| 50% | A coin-flip cumulative probability, not a guarantee. |
| 90% | Still leaves one failure in ten comparable runs. |