How the calculation works
The calculator adds the implied probabilities of every outcome: 1 divided by each decimal price. A total below 100% creates a theoretical arbitrage. Stakes are balanced to give a similar return whichever outcome wins.
For example, two outcomes both priced at 2.10 split a 100 total into 50 on each side. Either winning side returns 105, leaving 5 before fees. These are example prices, not an available offer.
Use matching markets
A football 1X2 market needs home, draw and away prices. A two-outcome market needs both opposing selections, such as over and under 2.5 goals. All selections must cover the same event, period and settlement rules.
This tool assumes one outcome wins and the others lose. It does not handle pushes, partial wins, lay bets or different rules for extra time. Prices changing or bets being declined can remove the calculated profit.