🎲Loot Drop Expected Attempts

Calculate expected attempts for item drops by probability

%
items

How to Use the Loot Drop Expected Attempts Calculator

Enter the drop rate percentage and how many copies you need. The calculator shows the average number of attempts, how many attempts give you a 50% chance of success, and how many give you a 90% chance.

Formulas

Expected Attempts = Target Count ÷ (Drop Rate ÷ 100)
50% Chance: minimum attempts needed for a 50% probability of success
90% Chance: attempts for a 90% probability — a realistic goal

The expected value is a mean, not a guarantee. Even at the expected number of attempts you only have ~63% success probability. Use the 90% figure as your realistic planning target.

FAQ

Is success guaranteed at the expected number of attempts?

No. The expected value is an average. After that many tries you have roughly a 63% chance of success — not 100%.

Can I calculate very low drop rates like 0.001%?

Yes — enter decimal values. The expected number may reach tens of thousands of attempts.

Does doubling the target count double the attempts?

Expected attempts scale proportionally. The 90% threshold grows more slowly as target count increases due to variance reduction.