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Arbitrage Calculator

Enter two opposing prices from different books and see instantly whether there's a risk-free arb — plus the exact stake split to guarantee the same return either way.

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Stake on A
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Stake on B
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Profit
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Return %
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An arb exists when (1 ÷ odds A) + (1 ÷ odds B) is below 1. Books limit or ban arbers, so treat live arbs as fleeting.

Pure arbs are rare — value bets aren't

Our model finds where one book is simply mispriced versus the fair line — far more plentiful than arbs. See today's value, free.

View today's best bets

Arbitrage — quick answers

What is an arb?

When prices across books are long enough to back every outcome and lock a profit — i.e. implied probabilities sum to under 100%.

How do I split the stake?

Stake each outcome in proportion to its implied probability so every result returns the same total.