Multiply the odds of every leg in a parlay (accumulator) and a stake to get combined odds, total payout, profit, and parlay implied probability.
Enter a stake and one leg price per line to get the combined payout.
Pure math only. Not financial advice; no real-money handling.
About this tool
The Parlay / Accumulator Payout Calculator combines several independent selections (legs) into one bet and works out what it returns. Each leg must win for the parlay to pay, and the prices multiply together: the combined decimal odds D are simply the product of every leg's decimal odds, D = d₁ × d₂ × … × dₙ. Your total payout is stake × D, and your profit is stake × (D − 1).
Enter your stake, pick the format your leg prices are quoted in (decimal, fractional, or American), and list one leg per line — the tool converts each to decimal, multiplies them, and shows the result. It also reports the combined odds back in American form and the parlay's implied probability, 1/D × 100%, which shrinks fast as you add legs because each additional leg multiplies the risk. A three-leg parlay at 1.50, 2.00, and 1.80 gives D = 5.40, so a 10 stake returns 54.00 for a 44.00 profit.
All math runs locally in your browser and nothing is uploaded. This is a pure arithmetic tool: it is not financial advice, handles no real money, and places no bets. It assumes standard 'all legs must win' parlay rules with no pushes or correlated markets.
Frequently asked questions
How is a parlay payout calculated?
Convert each leg to decimal odds and multiply them to get the combined odds D. Total payout = stake × D and profit = stake × (D − 1). For legs 1.50, 2.00, 1.80 the combined odds are 5.40, so a 10 stake returns 54.00.
Why does adding legs lower the win probability?
Every leg must win, so probabilities multiply. The parlay's implied probability is 1/D, and because each leg's decimal odds are greater than 1, adding legs raises D and drives the combined probability down while raising the potential payout.
Can I mix odds formats?
Each calculation uses one selected format for all legs — decimal, fractional, or American. Choose the format your book quotes, then enter one leg per line. Convert individual prices first with the Odds Converter if your legs are quoted differently.
How many legs can I add?
Enter one price per line for as many legs as you like (at least two makes it a parlay). The combined odds are the running product of every leg, so more legs mean a larger payout and a smaller chance of winning.