Arbitrage calculator
Two books, opposite sides of the same market - find out instantly whether the prices guarantee profit and how to split your stake.
The two prices
American oddsHow a two-way arb works
Convert each price to implied probability (1 / decimal) and add them. Under 100% means the market disagrees with itself enough that you can back both sides and profit regardless of the result. Splitting your total stake proportionally to each side's implied probability equalizes the return on both outcomes.
The real-world caveats
- Lines move. Arbs exist because one book is slow; the gap usually closes in minutes. Fill both sides fast or not at all.
- Limits and voids. A voided leg or a stake limit on one side turns an arb into a naked position.
- Account risk. Books limit accounts that only arb. Margins are typically 1-3%, so account longevity matters more than any single arb.
Arb hunting vs +EV betting
Arbing locks in tiny guaranteed margins; +EV betting takes the better side of mispriced markets for bigger long-run returns at the cost of variance. Our EV board surfaces those one-sided edges across 16+ books - with every pick tracked publicly.
Daily Results
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The daily pick and its graded receipt, straight from the tracked board.
For analytics and education only. Lines move quickly; verify prices before making any paid decision.