Split a total stake across 2 or 3 outcomes. Check payout, potential profit, and ROI at the odds you enter. Free, no signup needed.
Arbitrage betting compares prices for every possible outcome of the same market. If their implied probabilities total less than 100%, the entered prices allow stakes that target the same positive return across outcomes.
For a two-outcome example, enter +110 on both sides and a $100 total stake. The calculator splits it into $50 per side. At decimal odds of 2.10, either winning side pays $105: $5 profit and 5% ROI before any fees. This is a teaching example, not a live opportunity.
For a three-outcome market, include the draw or third outcome as well. Leaving out an outcome means the market is not fully covered. Confirm that every price is still available, limits permit the stakes, and all books use matching settlement rules.
A positive calculation does not guarantee an executed profit. A rejected stake, a moved line, a voided bet, or different overtime rules can leave an uncovered position.
An arbitrage result only works if every side can be placed at the displayed price. Confirm both outcomes are still live, the bet limits cover the suggested stakes, and each sportsbook grades the market the same way before committing money.
The key signal is total implied probability under 100%. If the combined price moves above 100%, the mathematical arbitrage disappears and the calculator will show the remaining hold instead of a true arb.
Be careful with stale odds, player props with different rules, pushes, voids, overtime rules, and alternate lines. Small arbs can turn negative quickly if one side changes or if a book only accepts part of the stake.
Use related Upside tools to shop game lines, compare optimizer workflows, and review broader +EV opportunities before relying on a narrow price gap.
I ran every pre-game arb my scanner found for an hour across five venues. Every one vanished before the click. Here is what killed it.