What's included
- Arbitrage Calculator. Calculate exact stake amounts for arbitrage betting across 2 or more bookmakers, so the profit is the same whichever outcome wins, at the prices you enter.
- Expected Value Calculator. Determine if a bet has positive expected value by comparing bookmaker odds to your true probability estimate.
- Kelly Criterion Calculator. Optimize bet sizing using the Kelly formula to maximize long-term bankroll growth while managing risk.
- Odds Converter. Instantly convert between American, Decimal, and Fractional odds formats, with implied probability for each. Probability goes the other way too — paste the percentage an exchange like Prophet X quotes and read it back as a price your bookmaker uses.
- Parlay Calculator. Calculate potential payouts for multi-leg parlays and accumulators.
- Implied Probability. Convert betting odds to implied probability percentages and compare against your own estimates.
- No-Vig Calculator. Remove bookmaker margin (vig) from odds to find true fair odds and spot mispriced markets.
- Bonus Bet Converter. Convert free bets and bonus bets to cash using optimal hedging strategies.
- Hold Calculator. Calculate the bookmaker hold percentage on any market. Lower hold means better value.
- Hedge Calculator. Calculate optimal hedge bet sizes to lock in a result at current prices or minimise loss on existing positions.
More calculators are on the way, including Point Spread, Round Robin, Poisson, and Dutching calculators.
How to use the calculators
- Choose your calculator. Select from 14+ specialized calculators based on what you need to calculate.
- Enter your data. Input odds, stakes, probabilities, or bankroll amounts.
- Get instant results. Receive immediate calculations with clear profit expectations.
- Apply to your bets. Use results to place informed bets with optimal sizing.