Parlay Calculator
Combine multiple legs to see combined odds, payout, and implied probability. Supports American, decimal & fractional odds, per-leg grading, Same Game Parlays, and Round Robin.
Your Legs
Parlay Results
Break-even win rate this parlay needs over time.
How the parlay calculator works
A parlay combines multiple bets (legs) into one. Every leg must win for the parlay to cash — a push drops that leg from the multiplication (reduced parlay), and any loss zeroes the payout. Combined odds are the product of each leg's decimal odds unless the sportsbook publishes a custom Same Game Parlay price.
Odds formats
Switch between American (-110, +250), decimal (1.91), and fractional (10/11). Your inputs are converted automatically.
Same Game Parlay
SGPs are correlated, so books quote a custom price. Toggle SGP and enter that price to see the true payout instead of the naive product.
Round Robin
Turn N legs into every K-leg combination — pick By 2s, 3s, 4s… and see total risk, max payout, and graded results across all generated parlays.
How to calculate parlay odds and payouts
A parlay (also called an accumulator or multi) combines several bets into one ticket: every leg has to win for the ticket to pay. To calculate parlay odds, convert each leg to decimal odds and multiply them together. Two -110 legs become 1.91 × 1.91 = 3.65, so a $100 parlay returns $365 ($265 profit). This parlay calculator does that instantly in American, decimal or fractional odds, drops pushed legs, and shows implied probability so you can see your break-even win rate.
How does a parlay calculator work?
A parlay odds calculator multiplies the decimal odds of every leg to produce the combined odds, then multiplies your stake by that number to show the total payout and profit. SAINT PICKS also grades pushed legs correctly and lets you enter American or fractional odds.
How are parlay payouts calculated?
Multiply the decimal odds of every leg, then multiply by your stake. The result is the total return; subtract the stake for profit. A pushed leg is removed from the multiplication, and a single losing leg voids the whole ticket unless you are using a Round Robin.
What is a Same Game Parlay (SGP)?
An SGP combines legs from one match. Because those legs are correlated, sportsbooks price the ticket lower than straight multiplication. Turn on the SGP override to enter the book's boosted or correlated price directly and grade it the same way.
What is a Round Robin bet?
A Round Robin splits your selections into every smaller parlay combination — 2-team, 3-team and up — so one bad leg doesn't kill the whole slip. The calculator shows each combination's payout plus total risk and the best- and worst-case return.
How do I convert American, decimal and fractional odds?
Positive American odds convert as 1 + (odds ÷ 100); negative odds as 1 + (100 ÷ |odds|). Fractional odds convert as 1 + (numerator ÷ denominator). Switch formats at the top of the calculator and every leg, the combined price and the payout convert automatically.
How do I know if my parlay is any good?
The calculator prices the ticket; it doesn't judge it. To grade the selections themselves, run the slip through the AI Bet Analyzer — it researches each fixture and returns a 0–100 score, a per-leg risk rating and your weakest leg. Or read the how to analyze a bet checklist to do it manually.
Once your ticket is placed, log it in the free bet tracker and bankroll manager to follow ROI and units over time, or check today's best bets and daily sports picks for parlay ideas.