THE TOOLKIT

Find your what-if.

Choose the rules, enter your numbers and get a result you can explain.

Find the chance of at least one rare pull from a 1-in-N rate and a number of packs.

Calculate drop chance after repeated attempts, expected tries and the risk of getting nothing.

Work out the minimum independent attempts needed for a 50%, 90%, 95% or custom success chance.

Calculate exactly k successes and at least k successes in independent trials.

Find your chance of winning a raffle with multiple tickets and prizes drawn without replacement.

Calculate exact-match odds for any fair pick-k-from-N number draw, without branded presets.

Calculate the chance of an exact total, at least a total or at most a total on fair dice.

Find exact and cumulative heads probabilities for fair or biased independent coin flips.

Model first-success odds with your own base rate, soft-pity increase, hard cap and current counter.

Compare an average cost per success with a fixed budget and the chance of getting nothing.

Convert odds in favor, odds against and 1-in-N chances into a percentage.

Calculate A and B, A or B, exactly one and neither for two independent events.