Convert win probability into fair decimal odds and break-even payout before comparing a casino offer, side bet, or promotion.
Compare a binary event’s probability with the offered net payout. Pushes and multi-category prizes need a full outcome table.
Fair decimal odds are 1 ÷ probability. A 20% win probability corresponds to fair decimal odds of 5.00 and a fair net profit of 4 units for each unit staked.
Enter the probability of the event itself, not a historical hit rate from a small sample. Pushes and partial returns require a fuller expected-value model.