Betting calculators
Every tool below runs entirely in your browser, works with decimal, American and fractional odds, and shows the formula behind its result. Nothing needs an account and nothing is sent to a server.
Payout and returns
Work out what a bet pays before you place it.
Bet Payout Calculator
Work out exactly what a single bet returns and what profit is left after your stake.
Open calculatorParlay Calculator
Multiply 2–20 selections into one combined price and see how small the real chance becomes.
Open calculatorAccumulator Calculator
The same multi-selection maths in UK and European terms, including voided legs.
Open calculatorEach-Way Calculator
Split a stake across win and place parts and see the return for every finishing result.
Open calculator
Odds and probability
Translate a price into a percentage and back.
Value and staking
Measure the margin, hedge a position, size a stake.
Bookmaker Margin Calculator
Measure the overround baked into a market and see the fair odds without it.
Open calculatorHedge Calculator
Find the stake on the opposing outcome that equalises profit or recovers your stake.
Open calculatorKelly Criterion Calculator
Size a stake from your own probability estimate — and see when the maths says zero.
Open calculator
Tracking
Measure what actually happened after the bet settled.