R.E.P.O. · Tool

Active calculator

R.E.P.O. Loot Drop Chance Calculator

Estimate at-least-one loot probability for R.E.P.O. extraction runs. Enter observed drop % and planned attempts.

Enter 2 for 2% (not 0.02).

How to use

  1. Enter a per-attempt drop chance as a percent (e.g. 3 for 3%).
  2. Enter how many extraction attempts you will make.
  3. Read at-least-one success odds and attempts needed for 50–99% confidence.

Formula

P(at least one) = 1 − (1 − p)^n under independent trials. Pity systems are not modeled.

P(at least one) = 1 - (1 - p)^n

Examples

4% rare drop, 40 attempts

P(at least one) ≈ 80.3%. Still expect dry streaks.

Independent math tool. Not affiliated with the R.E.P.O. developers. Selected via Findly radar.

Questions

Tool FAQ

Are these official R.E.P.O. rates?

No. You supply the probability from your own observations or patch notes.

EratoGame is an independent game information and tools platform and is not affiliated with the game developers or platform owners unless explicitly stated. Demo hub content is replaceable sample data for product structure — not an official wiki.