Arbitrage Betting Calculator

Enter odds from two or three bookmakers and a total stake. We'll work out the split and what it actually pays, all in your browser. Nothing gets sent anywhere, we don't want your numbers.

This assumes the odds you entered are still there when you actually place each bet. They might not be. Prices move fast and bookmakers correct mistakes quickly. See our worked example for how these numbers are derived, and our risks breakdown for the rest of what this doesn't account for.

How this calculator works

For each outcome, implied probability is 1 divided by the odds. If the implied probabilities across all outcomes add up to less than 100%, an arbitrage exists. Each stake is set proportional to its own implied probability, so the payout comes out roughly the same no matter which outcome actually happens.