Free calculator
Surebet calculator
Enter one odd per outcome to simulate allocations and scenario returns. The simulation does not guarantee profit. No sign-up.
How to use it
Pick how many outcomes the event has
Two in a tennis match, three in a football match where the draw pays. The calculator goes from 2 to 10.
Enter the best odd for each outcome
Each one can be at a different book — that is exactly what surebets live on. There is no reference odd here: every leg is the same kind.
Say how big the operation is
Enter the simulation total or the amount of an existing bet. In the latter case, the calculator returns the total required for the scenario.
Read the table
Review the allocation per odd, calculated returns, and estimated minimum result under the entered conditions.
What a surebet is
A surebet is a set of bets that covers every outcome of an event at prices good enough that any result pays back more than went in. It does not depend on you picking the winner: it depends on the books disagreeing enough with each other.
Books may price the same event differently. The calculation identifies a relationship between those prices; it does not confirm that every bet will be accepted or settled under the same conditions.
The formula
1/odd₁ + 1/odd₂ + … + 1/oddₙ
That sum is the total implied probability. If it is below 1, there is a surebet — and what is left over is the profit. Each leg takes the inverse of its own odd divided by that sum, and the fractions add up to 100%.
A worked example
Two outcomes: 2.60 at one book and 1.80 at another. The inverses add up to 0.9402 — below 1, so there is a surebet. With 100 in total:
- Outcome 1, odd 2.60: simulated stake 40.91; calculated return 106.37 if it wins.
- Outcome 2, odd 1.80: simulated stake 59.09; calculated return 106.36 if it wins.
Simulated total 100.00 · calculated minimum return 106.36 · estimated minimum net result 6.36 (6.36%).
What the calculator does not solve
It works out the stakes; the execution is still yours. The odd can drop between the first and the second bet, the book can accept less than you want to stake, and every account has its own rules about that. Check the figures on the ticket before confirming each leg.
Explore the other calculations
Stake Mate Pro is a value calculator: it reads the odds, estimates the fair odd, measures edge and EV+, and suggests exposure through the Kelly Criterion. This surebet calculator stays free and sign-up free — inside an account it gains your bankroll as context, and starts telling you how much of it the total represents.
Bet responsibly
A surebet is not risk-free: odds move, bets get refused, and accounts get limited. Only stake what you can afford to lose, and never money you need. Not for anyone under 18.