Surebet (Arbitrage) Calculator

Split your stake across two bookmakers when the odds create a surebet. Check arb %, guaranteed return and profit in seconds.

Two-way arbitrage calculator

Enter your total stake and decimal odds for each side of the market. The calculator will tell you how much to place on each outcome and whether it is a true surebet.

The total amount of money you want to risk across both bookmakers.
Used only for displaying stakes and returns. Calculations are currency-agnostic.
Decimal odds for the first outcome, e.g. 2.10.
Decimal odds for the second outcome, e.g. 2.20.
Optional label to remember which side you are betting on.
Optional label for the opposite side of the market.

How to approach surebets and arbitrage betting in practice

This surebet calculator helps you see whether two-way odds create an arbitrage opportunity and how to split your total stake so the profit is similar no matter which outcome wins.

How the surebet calculator splits your stake

The tool converts each set of odds into an implied probability and uses this to allocate your total stake. The goal is that both bets return roughly the same amount, turning a theoretical edge (arb %) into a stable profit instead of guessing stake sizes by hand.

Real-world risks with arbitrage betting

  • Bookmakers can limit or reject your stake, which makes it harder to place both sides exactly as calculated.
  • Odds can move between placing the first and second bet, destroying the surebet or even turning it into a negative edge.
  • Different rules between bookmakers (for example on voids, cancellations or player retirements) can lead to unexpected results.

Practical tips for using surebets

  • Keep a log of your surebets, including arb %, stakes and real profit after fees, to see how theory compares with practice.
  • Avoid drawing attention by mixing regular bets with arbs and withdrawing profits gradually.
  • Focus on reputable bookmakers with fast, reliable markets to reduce the risk of voided or delayed bets.

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Hedge Calculator
Odds Converter
Middle Bet Calculator

Related Guides

How to Find Value Bets
Understanding Odds Movement

Frequently Asked Questions

Arb % is based on the sum of the implied probabilities from both odds. If 1/odds1 + 1/odds2 is less than 1, the difference (in %) shows your theoretical edge.

No. In practice, limits, delays, voided bets and rule changes can all affect your results. The calculator only shows theoretical numbers.

You can, but live odds move very quickly. Always be aware that one side of the bet may change or be suspended before you can place both bets.