Arbitrage Calculator
Find guaranteed profit by betting on every outcome across different bookmakers. Enter the best odds for each outcome and see if an arb opportunity exists.
Setup
Home/Away — win/loss markets (most common)
Amount you want to spread across all bets
Outcome Odds
Enter the best odds available at any bookmaker for each outcome.
Quick Odds Reference
Total Investment
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Guaranteed Profit
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ROI
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Optimal Stakes per Outcome
| Outcome | Decimal Odds | Stake | Payout | Bookmaker |
|---|---|---|---|---|
| Enter odds to see optimal stakes | ||||
Implied Probability Breakdown
Enter odds to see probability breakdown
If total < 100%, an arb opportunity exists (the gap = your profit margin)
What Is Sports Betting Arbitrage?
Sports betting arbitrage (also called "arbing" or "sure betting") is the practice of placing bets on all possible outcomes of a sporting event across different bookmakers, in proportions that guarantee a profit regardless of the result.
It works because different bookmakers set their own odds, and occasionally the combination of their best odds creates a total implied probability below 100%. That gap below 100% is your guaranteed profit margin.
For example: if Bookmaker A offers Team A at 2.10 and Bookmaker B offers Team B at 2.05, the implied probabilities are 47.6% and 48.8% — totalling 96.4%. Betting proportionally locks in a 3.6% profit no matter who wins.
How to Use This Calculator
- Choose 2-way or 3-way depending on the market (most are 2-way)
- Select your preferred odds format (decimal is easiest)
- Enter the best available odds for each outcome from any bookmaker
- Set your total investment amount
- If the arbitrage % is below 100%, you have a profitable opportunity
- Place each stake exactly as shown in the table
Risks & Important Warnings
- Account bans: Bookmakers actively detect and ban arbers. Expect account limitations or closures.
- Odds changes: Odds can shift between placing your first and last bet — window closes fast.
- Voided bets: If one leg is voided, your hedge collapses and you may lose.
- Maximum bet limits: Books may cap your stake below what's needed.
- Withdrawal delays: Having funds spread across multiple books creates liquidity friction.
The Math Behind Arbitrage
Arbitrage % Formula
If Arb% < 100 → Profit opportunity
If Arb% > 100 → No arb (bookmaker wins)
Optimal Stake Formula
Profit = Total × (1 - Arb%) / Arb%
ROI = (1/Arb% - 1) × 100%