Arbitrage Betting Calculator
Enter odds from different sportsbooks for each outcome. If the arb percentage drops below 100%, you have a guaranteed profit — and we show you exactly how much to stake on each leg.
Quick start
- Enter odds for outcome A from one sportsbook
- Enter odds for outcome B from a different sportsbook
- Check the arb percentage — below 100% means guaranteed profit
- Enter your total stake to see exact amounts per leg
Sportsbook Odds
Results update instantly as you change odds or stake.
Try a quick example
Book A: Team A at -110, Book B: Team B at +120 — a 97.83% arb yielding a guaranteed $2.22 profit on $100.
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Arbitrage Calculator FAQs
What is arbitrage betting?
Arbitrage betting (arb betting) means placing bets on all outcomes of an event across different sportsbooks. When the combined implied probabilities total less than 100%, you guarantee a profit regardless of the result.
How do I know if an arbitrage opportunity exists?
Add the inverse of each outcome's decimal odds (1 / decimal odds). If the sum is less than 1 (i.e., the arbitrage percentage is below 100%), an opportunity exists. This calculator does that math for you instantly.
How much should I stake on each leg?
Each leg stake is proportional to its share of the total implied probability. The formula is: Stake_i = Total Stake × (1/d_i) / (arb%). This calculator shows the exact amount for each leg.
Is arbitrage betting legal?
Yes, arbitrage betting is legal in most jurisdictions. However, sportsbooks may limit or close accounts of known arb bettors. Always check local regulations and the terms of each sportsbook.
What is an "arb percentage"?
The arb percentage is the sum of implied probabilities across all legs. A value below 100% means the market is mispriced and a guaranteed profit is available. Lower is better — a 97% arb means a 3% guaranteed return.