Parlay calculator
Combine legs into one price: payout, profit and the implied chance that every leg wins.
How to use the calculator
- Enter your stake. The calculator works in plain numbers, so it fits whatever currency you bet in.
- Type one price per leg in decimal (1.91), American (-110 or +150) or fractional (10/11) odds. You can mix formats in the same parlay.
- Leave the boxes you do not need empty; a three-leg parlay only needs the first three.
- The combined odds, payout, profit and the implied chance that every leg wins update as you type.
Check every box against your bet slip before you trust the total. A leg the calculator cannot read, such as a price of 1.00 or less or an American price between -100 and +100, is skipped without a warning, and the combined price then comes out shorter than the one the sportsbook will actually offer you. American odds typed without their sign are read as decimal odds, which makes the total far too long.
The formula
- Combined odds = leg 1 x leg 2 x ... x leg n (decimal)
- Payout = stake x combined odds; profit = payout - stake
- Implied chance = 1 / combined odds (before the bookmaker margin on each leg)
Worked example above: 1.91 x 2.10 x 1.65 = 6.62, so a 10 stake pays 66.18.
More worked examples
- Two legs at -110: each is 1.909 in decimal, and 1.909 x 1.909 = 3.64. A 10 stake pays 36.45, and the implied chance that both legs win is 27.4%.
- Four legs at 2.00: 2 x 2 x 2 x 2 = 16.00, so a 10 stake pays 160 with an implied chance of 6.25%.
- A void leg: if the 2.10 leg in the example above is void and the sportsbook drops it, the parlay becomes 1.91 x 1.65 = 3.15, and a 10 stake pays 31.51.
Why the margin compounds
Every leg carries its own bookmaker margin, and multiplying the prices multiplies those margins too. Take coin-flip legs priced at 1.91 each instead of the fair 2.00. On a single leg the price is 4.5% short of fair; across two legs the parlay pays 3.65 instead of 4.00, about 8.8% short; across four legs it pays 13.31 against a fair 16.00, close to 17% short. That is why a long parlay can show a big number and still cost more per unit staked than the same picks bet one at a time.
Reading the implied chance
The implied chance is the probability the combined price suggests before the margin on each leg is taken out. For the three legs above, at 6.62, it is 15.1%: if the real chance of all three landing were exactly that, the parlay would break even over a long run of bets. Because each price contains a margin, the real chance behind a sportsbook parlay is usually a little lower, so read the figure as a ceiling rather than a forecast.
Questions players ask
How are parlay odds worked out?
Multiply the decimal odds of every leg. Three legs at 1.91, 2.10 and 1.65 give 6.62, so a 10 stake returns 66.18.
What happens if one leg is void?
Most sportsbooks drop the void leg and recalculate the parlay with the rest. Check the house rules: some void the whole bet.
Do parlays count for bonus rollover?
Often yes, and many sportsbooks set a minimum price per leg as well as for the whole parlay. The offer card lists the minimum odds.
How many legs can I add?
Up to 12. Boxes you do not need can stay empty, because the calculator multiplies only the legs it can read. Every extra leg lengthens the price and shrinks the implied chance: twelve legs at 1.91 combine to about 2,357, an implied chance of roughly 0.04%.
Does the calculator include the bookmaker margin?
No. It multiplies the prices exactly as you type them, so the margin already inside each price is carried into the combined odds. The implied chance it shows is the price talking, not a fair probability; the odds converter page shows how to take the margin out of a market.