Probability Ready to use
Drop Chance Calculator
Calculate the chance of getting at least one drop, the risk of going dry, and the attempts needed to reach your target odds.
Tools
Useful numbers, without the guesswork.
Game-agnostic calculators with explicit assumptions, practical outputs, and no account required.
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The toolkit
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Our standard
A calculator should show its work.
- Clear inputsUse the values and format you already know.
- Visible assumptionsKnow when a model does—or does not—fit your game.
- Actionable resultsGet the number that helps you make the next decision.