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Arbitrage / Surebet Calculator
For readers checking the arithmetic of a complete market. It compares theoretical payouts under identical settlement rules.
Examples are hypothetical. CU = currency units. Use one consistent currency wherever CU appears. No live prices or provider data are fetched.
How to read the result
A reciprocal sum below 100% indicates a theoretical pricing gap under the entered assumptions. The calculation does not show whether every bet can be accepted, or account for changing odds, limits, fees, voids or differing settlement rules.
Formula
- For each outcome i, calculate qᵢ = 1 / decimal oddsᵢ; S = Σqᵢ.
- Unrounded stakeᵢ = total stake × qᵢ / S. Allocate whole cents by largest remainder so stakes sum to the entered total.
- For each outcome: net resultᵢ = rounded stakeᵢ × oddsᵢ − total stake. Report the minimum result, rather than an unconditional profit.
Worked example
With 100 CU and odds 2.10, 2.10: S = 0.952381; stakes = 50.00 CU each; return = 105.00 CU; minimum modelled net result = 5.00 CU (5.00%).
Worked examples
Read the detailed guide: Arbitrage arithmetic: allocation, cents and settlement risk
Input specification and SEO alternatives
| Input | Type | Units | Default | Limits / choices |
|---|---|---|---|---|
| Total stake | number | CU | 100 | 0.01–1000000 |
| Decimal odds, separated by commas | Multiple input | 2–100 outcomes; each >1 and ≤1,000,000 | 2.10, 2.10 | 1–5000 characters; 2–100 outcomes; each >1 and ≤1,000,000 |
Meta description
Calculate equal-return stakes, implied probabilities and rounding effects for a complete set of mutually exclusive outcomes.
SEO title alternatives
- Arbitrage Calculator: Stakes and Payouts
- Surebet Calculator with Rounding Checks
- Arbitrage Odds and Stake Calculator
Outputs use English number formatting. Monetary amounts use two decimals; asset quantities use up to eight. Calculations retain unrounded intermediate values except the cent allocation stated for arbitrage.