OSRS Dry Calculator

Gaming & sims

OSRS Dry Calculator

Probability helper for repeated independent attempts (same p each trial).

Per-roll drop probability p (0–1)

Number of attempts

Result

Enter values and press Calculate.

Outputs are educational or illustrative unless noted. Verify critical decisions with official sources, syllabi, flight manuals, or in-game documentation.

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What is OSRS Dry Calculator?

A tool for Old School RuneScape that calculates how unlucky you are on a drop given a drop rate and number of attempts, it shows the probability of going that many kills without the drop. Helps players contextualize their dry streaks.