Tools
Free calculators for working through bonus terms, odds, and betting math — the same formulas professional bettors and matched bettors use, with the working shown.
- Free calculators
- 13Free calculators
Bonus Wagering Calculator
Work out total wagering required, expected loss, and time to clear a deposit bonus.
Odds Converter
Convert between decimal, fractional, American, Hong Kong, Malay, and Indonesian odds.
Arbitrage Calculator
Check two or three-way odds for a guaranteed-profit arbitrage opportunity and stake split.
Betting ROI Calculator
Calculate ROI, yield, average odds, and break-even win rate from your betting record.
Matched Betting Calculator
Work out lay stake, liability, and profit for qualifying bets and free bet conversions.
Casino Bonus Value Calculator
Turn a deposit bonus offer into a real expected-value number, not just a headline percentage.
Crypto Gambling Tax Estimator
Rough, educational estimate of how crypto gambling gains may be taxed in a handful of countries.
Kelly Criterion Calculator
Work out the mathematically optimal stake size for a bet given your edge and bankroll.
Parlay Calculator
Combine multiple bets into a parlay and see the combined odds, implied probability, and payout.
Hedge Betting Calculator
Work out the stake needed to bet the opposite outcome and lock in a guaranteed return.
No-Vig Odds Calculator
Strip the bookmaker margin out of a market's odds to estimate the true, fair odds.
Expected Value (EV) Calculator
Calculate the expected value of a bet given the odds, stake, and your true win probability.
RTP / House Edge Calculator
Convert a game's RTP into house edge and see the expected loss over a given number of bets.