Betting & Gambling Tools

Free calculators for odds, bonuses, arbitrage, and more.

Bonus Wagering Calculator

Work out total wagering required, expected loss, and time to clear a deposit bonus.

Convert between decimal, fractional, American, Hong Kong, Malay, and Indonesian odds.

Check two or three-way odds for a guaranteed-profit arbitrage opportunity and stake split.

Calculate ROI, yield, average odds, and break-even win rate from your betting record.

Work out lay stake, liability, and profit for qualifying bets and free bet conversions.

Turn a deposit bonus offer into a real expected-value number, not just a headline percentage.

Rough, educational estimate of how crypto gambling gains may be taxed in a handful of countries.

Work out the mathematically optimal stake size for a bet given your edge and bankroll.

Combine multiple bets into a parlay and see the combined odds, implied probability, and payout.

Work out the stake needed to bet the opposite outcome and lock in a guaranteed return.

Strip the bookmaker margin out of a market's odds to estimate the true, fair odds.

Calculate the expected value of a bet given the odds, stake, and your true win probability.

Convert a game's RTP into house edge and see the expected loss over a given number of bets.