Combined decimal = leg 1 times leg 2 times every other leg. All legs must win.
Combined decimal —
American —
Fractional —
Implied chance —
Total money received —
Type at least two valid legs.
18+ only. This is not a bet and not financial advice. Combined implied chance is the break-even rate inside the price, not a forecast.
A parlay (accumulator) wins only if every leg wins. This page multiplies the prices and applies your stake. It does not place a bet.
How to use this parlay calculator
Add at least two legs. Pick Decimal, American or Fractional on each row. Type the price from the ticket. Type the stake.
Crypto books such as Stake, BC.Game and Rollbit usually show decimal. US tickets show American. UK tickets show fractional.
What the numbers mean
Combined decimal is the parlay price including stake.
American and fractional are that same price in the other two prints.
Implied chance is 1 divided by combined decimal. It is the break-even win rate inside the price, not a forecast. A four-leg parlay of even-money prices is 6.25% implied, not 50%.
Total money received is stake times combined decimal.
The formulas
Decimal from fractional a/b = (a ÷ b) + 1.
Positive American +N = (N ÷ 100) + 1.
Negative American −N = (100 ÷ N) + 1.
Combined decimal = leg1 × leg2 × … × last leg.
Total money received = stake times combined decimal.
Implied % = (1 ÷ combined decimal) × 100.
Worked example
Stake 100. Three decimal legs: 2.00, 1.80, 1.50.
Combined = 2 × 1.80 × 1.50 = 5.40.
Total money received = 540. Implied = 18.52%.
Same three legs as American: +100, −125, −200.
Three legs at −110. Each decimal is about 1.909. Combined ≈ 1.909 × 1.909 × 1.909 ≈ 6.96. Stake 100 returns about 696. Implied chance about 14.4%. That is the break-even rate inside the price, not a forecast.
Parlay calculator FAQ
What if one leg is a push?
Most books void that leg and reprice the rest. This page does not drop a voided leg for you. Delete the row.
Does this work for a same-game parlay?
It multiplies the prices you type. It does not correct for legs from the same game that move together. The ticket price on an SGP can differ from this product.
Is this a bet?
No. It is arithmetic. 18+ only. Not financial advice.
Is a parlay the same as an accumulator?
Yes. Parlay is the US name. Accumulator or acca is the UK name. Same product of decimal prices.
How do I convert a leg before I add it?
Use the Odds Converter at /odds-converter, then paste the decimal into a row here.
More tools: /odds-converter, /provably-fair-verifier, /bonus-wagering-calculator, /house-edge-calculator.
