OSRS Pet Probability Comparison

A live comparison of single-roll pet chance, cumulative chance after the entered attempts, and the chance of still being dry.

Horizontal bar chart comparing OSRS pet chance per roll, cumulative pet chance, and dry chance. — Cumulative probability grows with more eligible attempts, but no probability below 100% guarantees a pet.

OSRS pet probability over repeated attempts

For a fixed independent drop probability p, the cumulative chance after n eligible attempts is 1 − (1 − p)^n. The dry chance is the complement. Reaching the nominal 1-in-N rate never guarantees the pet.

Source

OSRS Wiki

https://oldschool.runescape.wiki/w/Pet

Live Calciro probability comparison from the entered fixed pet rate and eligible attempts.

Use the Calculator

This diagram is part of the OSRS Pet Chance Calculator.

Open OSRS Pet Chance Calculator →