Free Tool · Betting Math

Arbitrage (Arb) Calculator

Check whether two prices form an arbitrage and get the stake split for a positive return on every outcome.

The calculatorLive · no signup
Arbitrage Check
YesArbitrage?
$50.00Stake A
$50.00Stake B
+$5.00Profit (both sides)
5.0%Profit %
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Equal return, either wayguaranteed +$5.00
YOUR STAKEIF A WINSIF B WINS$105.00$105.00GUARANTEED+$5.00+5.0%
Frequently asked2 questions
What is a sports arbitrage?
Betting all outcomes of an event at prices that produce a positive return whichever side wins, usually by combining odds from different books.
Why is there no arbitrage here?
When the inverse odds sum to 1 or more, the combined prices include enough margin that no stake split yields a profit on every outcome.
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Parlay Calculator→Combine multiple bets into one parlay and see the combined odds, total payout, and implied probability.Bet Calculator→Enter your odds and stake to see the exact payout, profit, and implied probability of a single bet.Odds Converter→Convert betting odds between American, decimal, and fractional formats, and see the implied probability.Expected Value Calculator→Estimate the expected value of a bet from your win probability and the offered odds.No-Vig Fair Odds Calculator→Remove the sportsbook's margin from a two-way market to get the fair odds and fair probability.Kelly Criterion Calculator→Find the bankroll-optimal stake from your win probability and the odds, with fractional-Kelly options.

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Arbitrage Calculator - Two-Way Betting Profit | Courtside