Arbitrage Calculator

An arbitrage (sure bet) exists when two sportsbooks disagree about a game enough that the implied probabilities of all outcomes add up to less than 100%. Back every outcome at the right size and you collect the same amount whoever wins — a locked-in profit from the disagreement itself.

Enter your total stake and the best available price on each outcome, each usually from a different book. The calculator splits your stake in proportion to each price's implied probability, shows the market total (under 100% means the arb is real), and the profit you lock in. Toggle 3-way for soccer and other markets with a draw. Use the round-to-$5 toggle to see what neat stake sizes cost you — books notice $488.89 bets more than $490 ones.