Arbitrage (Surebet) Calculator for Sports Betting
Free arbitrage (surebet) calculator: check whether odds from several operators leave a positive gap and split the amount to equalise the return.
This arbitrage calculator (surebet calculator) checks whether the odds of two or three operators on the same event leave a positive gap and splits the total amount so that the return is the same on every outcome.
Arbitrage (surebet) calculator
Checks whether the odds of two or three operators on the same event leave a positive gap and splits the amount to equalise the return.
| Outcome | Odds | Stake | Return |
|---|---|---|---|
| Outcome 1 | — | — | — |
| Outcome 2 | — | — | — |
| Outcome 3 | — | — | — |
In practice odds move, operators apply limits and rules (voids, account restrictions) and arithmetic slips cost money. The calculation is only arithmetic and ignores all of that.
How it works
Enter the total amount and the best decimal odds you found for each outcome of the event (even from different operators). If the implied probabilities add up to less than 100%, there is on paper a gap in favour of the split. If the sum reaches 100% or more, there is no positive gap and the split leaves a net result of zero or less.
Formulas
- Sum:
S = 1/D₁ + 1/D₂ (+ 1/D₃). A gap exists ifS < 1. - Stake on each outcome = total × (
1/Dᵢ) /S. - Equal return = total /
S; net result = total /S− total; gap =1 − S.
Worked example
Total 100 at odds 2.10 and 2.20: the sum is 93.07% (gap 6.93%). Stakes: 51.16 and 48.84. Equal return: 107.44; net result: 7.44.
Things to keep in mind
- This is paper arithmetic: in practice odds move between one bet and the next, and one of the two can change or close before you complete the pair.
- Operators can apply limits, void bets or restrict accounts; such rules can remove the gap or cause a loss.
- Check that the outcomes cover the whole event and that the rules (extra time, voids) are the same at both operators.
Next steps
- The stake split is the same maths as dutching, just with fewer outcomes to compare: split the stake over more outcomes.
- A sum below 100% is unusual because one operator's market normally carries a margin; why margin usually rules it out shows up in its odds.
- If the odds move before the second leg is placed, hedge an open position shows what is left.
Frequently asked questions
What is a surebet?
A combination of odds from several operators on the same event whose implied probabilities add up to less than 100%.
How do you calculate arbitrage betting?
Add the inverses of the decimal odds; if the sum is below 1, the gap is 1 − S and the amount is split in proportion to each inverse.
What are the risks?
Odds moving between bets, limits, voided bets, different rules at each operator and typing errors.
Can I use it with two outcomes?
Yes. Leave the third odds empty.
To convert odds formats use the odds calculator.
18+. Take part only where it is legal. Betting carries a risk of loss. Do not treat potential returns as a budget and do not chase losses. If gambling stops being under control, stop and look for help from the support services in your country.
