Arbitrage Calculator
Compare odds from two or three bookmakers and work out whether a risk-free profit (arbitrage) exists — and exactly how much to stake with each one.
Enter odds for at least two outcomes and a total stake to see the split.
This calculation is a guide. Odds move quickly and some bookmakers restrict accounts that consistently win from arbitrage — always check the live odds and your bookmakers' terms before placing any bets.
An arbitrage (surebet) exists when the odds on every outcome of an event, taken across different bookmakers, guarantee a profit no matter the result. An arbitrage calculator lets you quickly check whether such an opportunity exists and exactly how to split your stake across the bookmakers.
How the arbitrage calculator works
The calculator adds up the inverse odds (the implied probability) of every outcome. If the sum is below 1, an arbitrage exists — your combined stakes will always cover less than the guaranteed payout, locking in a risk-free profit no matter who wins. If the sum is 1 or higher, there is no risk-free profit to be found.
Stake per outcome = Total stake × (1/odds_i) ÷ Σ(1/odds)
The formula splits the stake in proportion to each outcome's implied probability, so the payout (stake × odds) is exactly the same whichever outcome happens. Profit is then the payout minus the total stake.
Worked example
Say you find odds of 2.10 on Team A at one bookmaker and 2.05 on Team B at another, in a match with no draw. The sum of the inverse odds is 1/2.10 + 1/2.05 ≈ 0.9636 — below 1, which means an arbitrage exists.
With a total stake of 1,000, the split is roughly 458.70 on Team A and 541.30 on Team B. Whoever wins, the payout is around 1,037.80, giving a guaranteed profit of about 37.80 — an ROI of roughly 3.78%.
Frequently asked questions
What is arbitrage betting (a surebet)?
Arbitrage betting means staking on every possible outcome of an event across different bookmakers, at odds that together guarantee a profit regardless of the result. The opportunity arises when bookmakers' margins and pricing differ enough from each other.
How do I know if an arbitrage exists?
Add up the inverse odds (1/odds) for every outcome. If the sum is below 1, a guaranteed profit exists — the lower the sum, the higher the profit margin. If the sum is 1 or higher, there is no risk-free profit.
Are there any risks to arbitrage betting?
Yes. Odds can change, or a bookmaker can limit your stake before you manage to place every leg, which breaks the arbitrage. Several bookmakers also limit or close accounts that consistently bet arbitrage. Always check the odds right before betting and place all legs as quickly as possible across every bookmaker.
