Odds Converter
Convert between decimal, fractional and American odds and see the implied probability.
Calculators
Ten calculators for odds, payouts, value, bankroll and poker maths. Everything runs in your browser; nothing you type is sent or stored.
Bet Payout Calculator
Work out total return and profit for a single bet.
Accumulator / Parlay
Multiply several selections into one combined price. Separate decimal odds with commas.
Implied Probability & Margin
Find the bookmaker margin (overround) and fair odds of a 2- or 3-way market.
Kelly Criterion
Suggested stake size from your estimated edge. Fractional Kelly is safer.
Arbitrage (Sure Bet) Calculator
Check two bookmakers' prices for a guaranteed-profit split.
Expected Value (EV)
Is a bet +EV? Compare the price with your own probability estimate.
Poker Pot Odds & Outs
Compare the price of a call with your chance of hitting your outs.
Bankroll & Unit Size
Set a unit as a small % of your bankroll to survive variance.
Bonus Wagering Calculator
See how much you must wager to clear a casino or bookmaker bonus and its expected cost.
Calculators are for education only. Outputs depend on the numbers you enter and are not predictions or financial advice. No bet is ever guaranteed to win.