Enter odds from two bookmakers to calculate guaranteed profit stakes — find your sure bet instantly.
Arbitrage betting (also called "sure betting" or "arbing") exploits differences in odds between bookmakers. By placing bets on all outcomes across different books, you guarantee a profit regardless of the result.
An arbitrage opportunity exists when the sum of implied probabilities across all outcomes is less than 100%. This calculator checks this automatically — if the "Arb Margin" is negative, a true arbitrage exists.
While mathematically guaranteed, practical risks include: bookmakers limiting or banning accounts, odds moving before all bets are placed, stake restrictions, and slow withdrawals. Most successful arbers use 10–20 bookmaker accounts and rotate activity.
In 2026, a frequent arb killer is not odds movement but mismatched void rules between books. One sportsbook may void a player prop if the athlete logs 0 minutes, while another grades it as a loss once the event starts. The same issue appears with tennis retirements, shortened baseball games, and same-day lineup scratches. Before placing both sides, open each book’s market rules for that exact bet type and confirm how non-starters, postponements, and partial events are settled. A “risk-free” arb can disappear at settlement.