Parlay Calculator
Add as many legs as you want, in any odds format. The calculator computes total payout, profit, and implied probability instantly. Works entirely in your browser.
All math runs in your browser. No data leaves this page.
Parlay Math, in Plain English
A parlay multiplies the decimal odds of every leg together. Convert American odds to decimal first if needed:
- Negative American (-110): decimal = 1 + (100 / |odds|). So -110 → 1 + (100 / 110) = 1.909.
- Positive American (+150): decimal = 1 + (odds / 100). So +150 → 1 + (150 / 100) = 2.50.
- Fractional (3/2): decimal = 1 + (numerator / denominator). So 3/2 → 1 + 1.5 = 2.50.
Multiply all leg decimals together, multiply by your stake, and the result is your total payout (stake included). Subtract the stake to get net profit.
Example: a 3-leg parlay at -110, +150, and 2.50 decimal:
$100 stake × 11.93 = $1,193 payout ($1,093 net profit)
Frequently Asked
How does a parlay work?
A parlay combines multiple individual bets (legs) into one wager. The payout multiplies the odds of each leg together, producing much larger potential winnings than any single bet. The catch: every leg must win for the parlay to cash. One losing leg voids the entire parlay.
Can I mix American, decimal, and fractional odds in the same parlay?
Yes — sportsbooks accept whatever format you enter, but they convert internally to a single representation (usually decimal) before computing payout. This calculator does the same: enter each leg in whichever format is convenient, and the math works identically.
Why are 4-leg parlays so popular?
A 4-leg parlay at standard -110 prices each (1.91 decimal) pays roughly 12.28x your stake. That hits the sweet spot between achievable (each leg has roughly 52% implied probability) and high-payout. Beyond about 6 legs, the cumulative probability drops fast enough that EV typically goes negative even before vig.
What is a same-game parlay (SGP)?
A same-game parlay combines multiple bets from a single game (e.g., team to win + a player prop + a total) into one parlay. Because legs are correlated (e.g., a QB throwing for 300+ yards is correlated with the team scoring more points), books charge a premium and price SGPs differently from straight parlays. This calculator handles uncorrelated parlays; SGP pricing is operator-specific.
How is parlay payout calculated?
Convert each leg to decimal odds, multiply them together, then multiply by your stake. Example: three legs at -110, +150, and 2.50 decimal → 1.91 × 2.50 × 2.50 = 11.94. A $10 stake pays $119.40 (including the original stake). The calculator above shows this work step-by-step.