Rex says
The fast lane for the math you almost remember from school. Type the numbers, get the answer, move on with your day.
Try a scenario
Click to load — tweak from there.Inputs
Result
Total payout
$455.58
Profit
$405.58
Combined decimal odds
9.112
Combined American odds
811
Implied win probability
10.98%
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter stake ($).
- 2Enter leg 1 (american odds).
- 3Enter leg 2.
- 4Enter leg 3.
- 5Enter leg 4 (0 to skip).
- 6Read your total payout on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
Multiply decimal odds across legs to get combined odds, total payout, and the implied win probability of the whole ticket — usually much lower than it feels.
Worked example
Using the values the calculator loads with:
Inputs
- Stake: 50 $
- Leg 1 (American odds): -110
- Leg 2: -110
- Leg 3: 150
- Leg 4 (0 to skip): 0
Results
- Total payout: $455.58
- Profit: $405.58
- Combined decimal odds: 9.112
- Combined American odds: 811
- Implied win probability: 10.98%
What each field means
Inputs
- Stake ($)
- The stake used in the calculation, measured in $. Starts at 50 $ so you have a working example on load.
- Leg 1 (American odds)
- The leg 1 (american odds) used in the calculation. Starts at -110 so you have a working example on load.
- Leg 2
- The leg 2 used in the calculation. Starts at -110 so you have a working example on load.
- Leg 3
- The leg 3 used in the calculation. Starts at 150 so you have a working example on load.
- Leg 4 (0 to skip)
- The leg 4 (0 to skip) used in the calculation. Starts at 0 so you have a working example on load.
Results
- Total payout
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Profit
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Combined decimal odds
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Combined American odds
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Implied win probability
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
Why is the implied probability so low?
Probabilities multiply. Four coin-flip legs is a 6% ticket even though each leg feels close to even money.
Does this account for the book's vig?
It uses the posted odds, which already include the margin. The implied probability shown is therefore slightly above the true fair probability.
Accuracy and limitations
- Results are rounded for display; the underlying calculation keeps full precision.
- Very large or very small inputs may hit floating-point limits in the browser.
- Inputs outside the accepted range are clamped rather than rejected.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Parlay Odds & Payout Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/parlay-odds
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/parlay-odds" target="_blank" rel="noopener">Parlay Odds & Payout Calculator — RevenueLab</a> (2026).</p>
Source: [Parlay Odds & Payout Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/parlay-odds) (2026).