What is a surebet and how arbitrage betting works
A surebet —also called arbitrage bet or sure bet— is an opportunity where odds from different bookmakers on the same event let you cover every outcome and lock in mathematical profit. Our surebet calculator analyzes the odds you enter, detects arbitrage in milliseconds and computes the optimal stake distribution to guarantee the same return whichever side wins.
Arbitrage betting formula
The formula is simple: if the sum of 1/odds across outcomes is less than 1, a surebet exists. The remaining margin (1 − ΣP) is your guaranteed profit before commission. This odds calculator applies the formula automatically for 2-way, 3-way (1X2), Asian handicap and custom-spread markets.
When to use this surebet calculator
Use it whenever you spot meaningful price gaps between bookmakers in markets like 1X2, Over/Under, BTTS, Asian handicap or corners. It's ideal for comparing odds from Pinnacle, Bet365, Betfair, William Hill, Bwin or any sportsbook and for sizing stakes against your bankroll.