Private beta · 21+ where applicableInformation only · We do not take bets or handle player fundsContact
OddsVerity
Request early access
ODDSVERITY TOOL

Arbitrage Calculator

Check a theoretical two-outcome arbitrage, calculate proportional stakes, equalized return, theoretical profit and ROI. Your values remain in this browser and are not submitted to a sportsbook.

How to use it

Theoretical arbitrage detected

Combined implied probability95.24%
Theoretical ROI5.00%
Stake on outcome A$500.00
Stake on outcome B$500.00
Equalized gross return$1050.00
Theoretical profit / loss$50.00

Educational calculation only. Prices, limits, settlement rules, rounding and fees can change the real outcome. This tool does not place bets or guarantee profit.

Want saved comparisons and price alerts?

Join the private-beta list for OddsVerity Pro. No card is required today.

Request early access →
HOW IT WORKS

Test whether two prices cover every outcome below 100%

The calculator divides the total stake in proportion to each inverse price so the gross return is equalized. Real execution can differ because prices move, stakes may be limited and markets may settle under different rules.

FormulaCombined probability = 1 ÷ odds A + 1 ÷ odds B. A value below 1 indicates a theoretical price arbitrage before limits, void rules, delays and fees.

Examples

  • Odds of 2.10 and 2.10 total 95.24% implied probability.
  • A $1,000 theoretical allocation becomes $500 on each side with a $1,050 equalized gross return.

Frequently asked questions

Does a result below 100% guarantee profit?

No. The result is mathematical only. Price movement, rejected stakes, limits, fees, voids and non-equivalent market rules can remove the opportunity.

Why are the two stakes different?

The calculator weights each stake by the inverse of its odds so the theoretical gross return is equal for either outcome.

How to read the result

The calculator applies standard mathematical formulas to the numbers you enter. It cannot confirm account eligibility, available limits, market equivalence or whether a displayed price remains available.

Responsible use

Betting involves financial risk. Never treat a theoretical calculation as guaranteed profit, and always verify local laws and the operator's final terms.