Arbitrage Calculator
An arbitrage (or 'surebet') is when the odds across different bookmakers on the same event let you back every outcome and lock in a guaranteed profit, whatever happens. This free arbitrage calculator works out exactly how much to stake on each outcome so every result returns the same payout.
Enter the best available odds for each outcome, then a total stake (or fix one leg's stake). It splits the rest to equalise the payout and shows your guaranteed profit and the combined overround — an arb exists whenever that overround is below 100%.
Edit any odds, then enter the total stake or a single leg's stake — the rest fill in automatically to lock an equal payout.
Total stake
100.00
Payout (each outcome)
103.73
Profit
+3.73 (3.73%)
Overround
96.40%
Serious about your edge?
ProfitBetting tracks every bet's closing line value against Pinnacle automatically — so you know if you're really beating the market, not just guessing.
Frequently asked questions
How do I know if a bet is an arbitrage?
Add up 1/odds for each outcome (the implied probabilities). If the total is below 100% (1.0), an arbitrage exists and this calculator will show a guaranteed profit.
How are the stakes calculated?
Each outcome is staked so it returns the same payout. For a target payout P, the stake on an outcome with odds O is P / O. The tool does this for you from a total stake or a single fixed leg.
Is arbitrage betting risk-free?
The maths is risk-free, but practical risks remain: odds can move before you place all legs, limits may be low, and books can void or restrict accounts. Place the legs quickly and double-check stakes.
Related reading
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<p style="font:13px/1.4 system-ui,sans-serif;margin:8px 0 0">Free <a href="https://profitbetting.io/tools/arbitrage-calculator">Arbitrage Calculator</a> by ProfitBetting</p>