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Prediction Market Parlay Calculator

Calculate parlay odds, payouts, and ROI for multi-leg bets.

$
Odds Type
1
2

Results

Parlay Odds

+264

To Win

$264.46

Total Payout

$364.46

ROI

264.5%

What does this calculator do?

The parlay calculator combines multiple prediction market or sportsbook legs into a single calculation, showing you the joint probability, combined odds, total payout, and return on investment. A parlay pays more than any individual leg because you're wagering that multiple independent events all resolve in your favor — the more legs, the higher the potential payout and the lower the probability of winning.

Enter each leg as a prediction market price (0 to 1) or American odds, along with your stake, and the calculator multiplies the decimal odds to produce your combined payout. For prediction markets, each leg's price is its decimal odds — a 0.65 contract has decimal odds of 1/0.65 ≈ 1.538. The parlay multiplies all legs together: three legs at 0.65, 0.70, and 0.80 give a combined probability of roughly 36.4%, meaning all three need to resolve correctly for the parlay to win.

Use the parlay calculator alongside the Expected Value calculator to check whether a multi-leg position has positive EV. A high potential payout doesn't mean a parlay is worth taking — if each leg's market price is already fair (zero edge), the parlay's EV is also zero regardless of the multiplied payout. Edge in a parlay has to come from edge in the individual legs.

For prediction markets specifically, also factor in fees before calculating your parlay. Use the Market Fees calculator to find the true cost-adjusted price on each leg, then enter those adjusted prices here. The difference between gross and net parlay returns can be significant across multiple legs.

Frequently Asked Questions

Are parlays positive EV?

Only if you have a genuine edge on the individual legs. If each leg is fairly priced — the market’s implied probability equals the true probability — combining them into a parlay produces zero EV. The larger payout exactly compensates for the lower probability. Parlays amplify edge if you have it and amplify negative EV if you don’t.

Does this account for platform fees?

No — the calculator uses raw prices. For prediction markets, use the Market Fees calculator to adjust each leg’s effective price before entering it here.

Can I parlay markets across different platforms?

Not natively — no prediction market offers cross-platform parlays. You’d place individual positions on each platform manually. Your combined outcome is effectively a manual parlay, but each leg settles independently with its own fees.

How many legs can I add?

The calculator supports as many legs as you want to add. In practice, the probability of winning drops sharply with each additional leg — five legs each at 70% gives a combined probability of only 16.8%.