Surebet (Arbitrage) Calculator
Split your stake across books for a guaranteed profit.
| Outcome | Odds | Stake | Return |
|---|---|---|---|
| Outcome 1 | 2.10 | 500 ₽ | 1,050 ₽ |
| Outcome 2 | 2.10 | 500 ₽ | 1,050 ₽ |
How it works
An arbitrage (surebet) exists when different bookmakers price the same event so generously that backing every outcome guarantees a profit. It works when the implied probabilities (1 ÷ odds) sum to less than 100%.
Split your total stake in proportion to each outcome's implied probability and every result returns the same amount — the total stake divided by that sum. The surplus over your stake is the locked-in profit, whoever wins.
Surebet (Arbitrage) Calculator
A surebet (also called an arbitrage or arb) is a set of bets across different bookmakers that guarantees a profit no matter which outcome occurs. This free surebet calculator checks whether an arbitrage exists, splits your total stake across the outcomes, and shows the locked-in return and profit percentage.
When does an arbitrage exist?
Each price implies a probability of 1 ÷ odds. Add the implied probabilities for every outcome of the same event: if the total comes to less than 100%, an arbitrage exists. That happens when two bookmakers disagree enough — one is generous on the home side, another on the away side — to cover the whole market with room to spare.
The further below 100% the sum sits, the bigger the guaranteed margin. Real arbs are usually small (0.5–3%) and disappear quickly as books adjust their lines.
How to split the stake
Stake on each outcome in proportion to its implied probability: stake = total × (1 ÷ odds) ÷ sum-of-implied. Done correctly, every outcome returns exactly the same amount — your total stake divided by that sum — so the profit is identical whoever wins.
Enter the odds from each bookmaker and your total budget; the calculator returns the exact stake for each side, the guaranteed return and the profit in money and percent.
The risks behind a guaranteed profit
Arbitrage is mathematically risk-free but practically fragile: odds move while you place the second leg, limits and bet cancellation are real, and books restrict accounts that arb consistently. Treat the calculator's profit as the best case if both bets land at the quoted prices.
What is a surebet?expand_more
A combination of bets on every outcome of an event, placed at different bookmakers, where the odds are generous enough that you profit no matter the result.
How do I know if odds are an arbitrage?expand_more
Add 1 ÷ odds for each outcome. If the total is below 1 (100%), it is an arbitrage. For example 2.10 and 2.10 give 0.476 + 0.476 = 0.952, a 4.8% arb.
How much profit do surebets make?expand_more
Usually little — most real arbitrage opportunities are between 0.5% and 3% of the stake, and they vanish quickly as bookmakers correct their lines.
Are surebets legal?expand_more
Arbitrage betting is legal, but bookmakers dislike it and may limit or close accounts that do it regularly. The mathematical edge is real; the practical risk is account restrictions and odds moving before both bets are placed.