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Sports Betting Arbitrage & Hedge Calculator

Split a bankroll across opposing prices and compare the return on each outcome.

  • Free
  • No sign-up
  • Runs in your browser

Size an arbitrage or hedge

Market prices
Stake plan

Calculation result

Example inputs
Result—

Enter the example values to calculate a result.

How it works

  1. How an arbitrage bet works

    A betting arbitrage exists when the implied probabilities of every outcome add up to less than 100%. That gap can let you cover both sides at different sportsbooks and finish with the same positive return whichever side wins. The calculator sizes each stake from the odds you enter and shows whether the combined market clears the break-even point.

    Use decimal odds internally or enter American prices such as +120 and -110. The calculation assumes both wagers are accepted at the displayed price, settle under matching rules, and cover every possible outcome.

  2. Hedge bet sizing formula

    For two outcomes, the arbitrage percentage is 1 ÷ decimal odds A plus 1 ÷ decimal odds B. When that total is below one, the ideal stakes are proportional to each outcome’s inverse price. For a hedge against an existing wager, enter the first stake as the bankroll and the calculator balances the gross payout on both sides.

    For example, +120 and +110 convert to decimal odds of 2.20 and 2.10. Their implied probabilities total about 93.0%, leaving an estimated 7.0% gross arbitrage margin before limits, fees, or price movement.

  3. Check the ticket before placing it

    Compare the event, market period, overtime rules, player participation rules, and settlement source before hedging. A stale line, rejected wager, stake limit, or different market definition can remove the apparent edge. Enter the prices available to you now and recalculate if either price moves.

Frequently asked questions

How do I calculate an arbitrage hedge bet?

Convert both American odds to decimal odds, add their reciprocal implied probabilities, and compare the sum with 1. If it is below 1, allocate stakes in proportion to the reciprocal prices so each winning outcome returns the same amount.

Can an arbitrage bet guarantee a profit?

The arithmetic shows a profit only if every wager is accepted and the markets settle consistently at the entered odds. Limits, voids, changing prices, and account restrictions can change the result.

What does a negative arbitrage result mean?

The combined implied probability is at least 100%, so the quoted pair cannot lock in a positive return at the entered stake.