Tennis Betting Odds & Arbitrage Calculator
Calculate implied probability from tennis odds (Decimal, Fractional, Moneyline). Identify arbitrage (Surebet) opportunities and check bookmaker margins instantly.
Reference: Average Bookmaker Margins
| Bookmaker | Avg Margin | Rating |
|---|---|---|
| Pinnacle | 2.3% | Best |
| Betfair (Exchange) | 2.5%* | Good |
| Bet365 | 5.1% | Avg |
| Bovada | 5.8% | High |
About
In sports markets, odds represent more than just potential returns; they indicate the Implied Probability of an outcome. For tennis bettors, identifying discrepancies between bookmakers is key to finding value or securing a guaranteed profit through Arbitrage. This tool converts between Decimal, Fractional, and American formats while simultaneously calculating the Bookmaker's Margin (the "Vig"). If the combined implied probability of both players is less than 100%, an arbitrage opportunity exists, and the calculator determines the precise stake distribution required to lock in a profit regardless of the match winner.
Formulas
The arbitrage condition relies on summing the implied probabilities of all possible outcomes (Player A and Player B). If the sum S is less than 1, the market is inefficient.
If S < 1, Profit is guaranteed. The stake for Player A (Stakea) given total investment T is:
Reference Data
| Odds Format | Example | Implied Prob Formula | Conversion to Decimal |
|---|---|---|---|
| Decimal (EU) | 1.90 | 1Odds | x |
| American (US) | -110 / +120 | Neg: |O||O| + 100 | Neg: (100/|O|)+1 |
| Fractional (UK) | 4/5 | DN + D | (N/D)+1 |
| Arbitrage | Any | P1 + P2 < 100% | N/A |