Free tool
Enter both sides of a two-way market and a total stake. We split the stake so the payout is the same either way.
No. You enter both prices yourself. The calculator only splits a stake and shows whether those prices return more or less than the total stake.
Most two-way pairs include sportsbook margin. The equal-payout split can lock a loss when the two prices do not clear that margin.
No. They are rare, move fast, and can lead to account limits. Always check rules, timing, and maximum stakes.
These two entered prices return more than the total stake after the split. Real arbitrages are rare, vanish fast, and can get accounts limited. 21+ · Bet responsibly
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The honest explainer
When two books disagree enough, the two sides' implied probabilities sum to less than 100%, and a split stake locks the gap as guaranteed profit. The math is real and this calculator does it exactly.
The math is also the easy part. Arbitrage is an operations problem — getting both legs down at quoted prices, at sufficient size, repeatedly — and the operational risks are what the calculator cannot see.
+110 at book A, −102 at book B: implied 47.6% + 50.5% = 98.1%. Splitting $1,000 proportionally ($485 on A, $515 on B) returns about $1,019 whichever side wins — a locked ~1.9%. Note the shape: hundreds of dollars exposed, two books, one game, nineteen dollars earned.
The part the paid-tool ads leave out: You will get limited — read the honest guide →