Parlay calculator
List the odds of every leg, enter your stake and see what the parlay pays if every selection wins. The calculator multiplies the legs' decimal odds and shows the result in all three odds formats with its implied probability.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Choose the format your odds are in.
- Type the odds of each leg, separated by commas or spaces, for example
-110, -110, +150.
- Enter the stake. The payout, profit and combined odds update as you type.
How it works
A parlay rolls the whole return of each leg into the next one, so the decimal odds multiply:
- Parlay decimal odds = d₁ × d₂ × … × dₙ.
- Payout = stake × parlay odds; profit = payout − stake.
- Implied probability = 1 ÷ parlay odds, which equals the product of each leg’s implied probability.
American and fractional odds are converted to decimal first (+A → 1 + A ÷ 100, −A → 1 + 100 ÷ A, n/d → 1 + n ÷ d) and the result is converted back.
Worked example
Legs −110, −110 and +150 with a stake of 10:
- −110 → 1 + 100 ÷ 110 = 1.9091 (twice); +150 → 2.50.
- 1.9091 × 1.9091 × 2.50 = 9.1116, or +811.16 in American odds.
- Payout 10 × 9.1116 = 91.12; profit 81.12.
- Implied probability 1 ÷ 9.1116 ≈ 10.98%.
Tips
- Every extra leg multiplies the bookmaker’s margin too, so long parlays tend to carry a larger edge against you.
- Correlated legs (for example a team to win and its star to score) may be restricted or priced differently by bookmakers.
- Bet only what you can afford to lose.
Frequently asked questions
How is a parlay payout calculated?
Convert each leg to decimal odds and multiply them. The payout is the stake times that product; the profit is the payout minus the stake. Three legs at −110, −110 and +150 give 1.9091 × 1.9091 × 2.5 = 9.1116, so 10 returns 91.12.
What happens if one leg loses?
The whole parlay loses. Every leg must win for it to pay, which is why the payout is large and the chance of winning is small.
What about a push or a void leg?
Many bookmakers drop a pushed or void leg and pay the parlay on the remaining legs. Remove that leg from the list to see the new payout. Check your bookmaker's rules, as they differ.
What does the implied probability mean here?
It is 1 divided by the parlay's decimal odds: the chance that all legs win as priced by the odds. Because each price contains the bookmaker's margin, the real chance is usually lower.
Can I mix formats?
Not in one list. Pick one format and enter every leg in it, or convert the odd ones first with the odds converter.