Arbitrage Calculator
Find guaranteed profit opportunities by comparing odds from different sportsbooks. Calculate optimal stake distribution for risk-free returns.
Enter American odds for both outcomes and your total stake
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Understanding Arbitrage Betting
What Is Arbitrage Betting?
Arbitrage betting (also called "arbing" or "sure betting") exploits differences in odds between sportsbooks to guarantee a profit regardless of the outcome. When the combined implied probability of all outcomes drops below 100%, you can distribute your stake proportionally to lock in a risk-free return.
How Does It Work?
Sportsbooks set odds independently, and their lines can diverge -- especially around line movements, injuries, or sharp money. If Sportsbook A offers +150 on Team X while Sportsbook B offers +150 on Team Y, the combined implied probability is only 80% (40% + 40%). By splitting a $1,000 stake proportionally, you guarantee the same payout regardless of which team wins, netting a profit of $250.
Practical Considerations
Real arbitrage opportunities are rare and usually small (1-3% margins). They require accounts at multiple sportsbooks with sufficient funds. Odds can change rapidly, so speed matters. Some sportsbooks limit or ban accounts they suspect of arbing. Always factor in the time and effort when evaluating whether an arbitrage opportunity is worth pursuing.
The Math Behind Arbitrage
For a two-outcome event, arbitrage exists when: (1/DecimalA) + (1/DecimalB) < 1. The profit is calculated as: (Total Stake / Total Implied Probability) - Total Stake. Each outcome's optimal stake is: Total Stake x (Individual Probability / Total Probability). This ensures equal payouts regardless of the result.