Arbitrage betting calculator
Enter the best odds on each outcome, from different books, and a total stake. If the implied chances add up to less than 100%, it's an arbitrage: the stakes shown pay the same whatever happens.
How an arbitrage works
Different books disagree. When one pays well on side A and another pays well on side B, the two prices can add up to less than 100%, and betting both locks a profit.
arb if Σ (1 / decimal odds) < 1 · stakei = total × (1 / oddsi) / Σ (1 / oddsj)
Worked example: +105 / +102
+105 is decimal 2.05 (48.78%) and +102 is 2.02 (49.50%). Together 98.29%, under 100%, so it's an arb worth 1 / 0.9829 − 1 = +1.74%.
With $100: $49.63 on A and $50.37 on B. Either result pays $101.74, a $1.74 profit.
What goes wrong
- Prices move. Place the leg most likely to move first, and check the other is still there.
- Stake limits. A book may accept less than you asked; recompute the other leg.
- Different rules. Overtime, void and push rules must match on both sides, or one leg can lose while the other is refunded.
- Account limits. Books limit accounts that bet arbs often. See how to avoid sportsbook limits.
Is it allowed? See is arbitrage betting legal.
Questions
How do you calculate an arbitrage bet?
Convert each outcome's best odds to an implied chance (1 / decimal odds) and add them up. Under 100% is an arb. Stake each outcome in proportion to its implied chance.
Can you arbitrage a 3-way market?
Yes. Soccer's home/draw/away works the same way: add up all three implied chances and split the stake across all three.
How much can you make with arbitrage betting?
Most arbs are small, often 0.5% to 3% of the total stake, and they close quickly. The profit comes from volume, which is also what gets accounts limited.
Related
Updated 2026-10-26