Add as many legs as you want. Mix American, decimal, and implied probability freely — we convert them all to decimal under the hood and compute combined odds, win probability, and payout.
Legs (3)
1
2
3
Parlay Result
Combined odds+702 · 8.018
True implied probability12.47%
Stake$10.00
Profit$70.18
Total payout$80.18
Combined odds assume each leg is independent. Same-game parlays are not independent — the real fair price is usually worse than this.
How parlay math works
A parlay multiplies the decimal odds of each leg: combined = d₁ × d₂ × … × dₙ. Total payout = stake × combined. Profit = payout − stake.
Each leg must hit or the parlay loses. This stacks the sportsbook's vig on every leg, which is why straight multi-leg parlays at standard pricing have meaningful negative EV. The route in is to build parlays entirely from +EV legs, or from +EV correlated legs in an SGP.
Frequently asked questions
How do you calculate parlay odds?+
Multiply the decimal odds of each leg. A 3-leg parlay at 1.91 × 1.91 × 1.91 = 6.97 decimal, or about +597 American. The implied probability is 1 / 6.97 = 14.35%.
Are parlays a good bet?+
Standard parlays carry compounded vig: each leg has the book’s margin baked in, and parlays multiply that margin. They have positive EV only if every individual leg is +EV. DFS-style parlays (PrizePicks, Underdog) use fixed payouts (1.84x – 6.5x for 2–3 legs) and can be +EV if your model edge is high enough.
What is a same-game parlay (SGP)?+
A parlay where multiple legs are from the same game. Books price SGPs with a correlation adjustment because the legs are not independent — for example, a QB throwing for 300 yards correlates with a WR going over receiving yards. Sharp SGP betting requires modeling correlation explicitly.
Does this calculator handle DFS parlays like PrizePicks?+
Yes — paste the fixed payout (1.84 decimal for 2-leg PrizePicks, 3.5 decimal for 2-leg Underdog Power, 6.5 for 3-leg, etc.) as one leg. For a true DFS lineup with multiple props at fixed payouts, enter each prop as a separate leg.
What is the true probability of my parlay?+
It is the product of each leg’s true probability — the probability you get from a probability model, not implied probability. The Turtle +EV picks platform shows true probability for every prop our model evaluates.
Calculators are free. The Turtle +EV picks platform runs every prop through a sport-specific model and ranks the ones where the line is mispriced. NBA · NHL · MLB · Soccer · Tennis. 48 books.