A parlay where you get extra points on every leg in exchange for lower payout.

What is a round robin?

A wager that automatically builds every parlay combination of a chosen size from your selected teams.

A conditional bet: if the first bet wins, the winnings automatically go on the next one.

What is an action reverse?

Two or more if-bets linked in both directions; each leg triggers the next with "action" (the chain proceeds even on a push or no-action leg).

Free tool — open to everyone, no account needed

Parlay Calculator

Name: The Cold Line
Price range: $$

Price a straight parlay, teaser, round robin, if-bet, or action reverse in American or decimal odds — with plain-language explanations of every term.

Estimates only — not a guarantee. Sportsbooks price parlays, teaser cards, and reverses with their own odds, rules, and limits. Always confirm the actual price and payout on your betting slip before placing anything.

How this works — straight parlay

A single bet that links two or more picks together. All legs must hit to win. Higher risk, bigger payout.

Every leg must win. The combined odds are all your legs multiplied together, which is why payouts grow fast — and why the win chance shrinks just as fast.

Worked example (editable — load it below): two legs at -110 each combine to about +264. A $100 stake returns $364.46 — your $100 back plus $264.46 profit.

Build your ticket

Stake (Wager Amount) (enter your wager amount)

Your total risk for this ticket.

Odds format (auto-detect reads -110 or +150 as American and 1.91 or 2.50 as decimal)

AutoAmericanDecimal

Teams / Legs (how many picks to combine)2(this mode supports 2–12)

Parlay leg 1 (enter or edit the line below)Moneyline (enter the odds, such as -110 or +150)
Waiting for odds…
Parlay leg 2 (enter or edit the line below)Moneyline (enter the odds, such as -110 or +150)
Waiting for odds…

Vig (sportsbook margin — enter a percentage if known)

Optional. If provided, we also show an approximate no-vig ("fair") win probability.

Results

Enter valid odds for every leg (fix the highlighted rows).

Rounding rules

All math runs at full precision; rounding happens only when a number is displayed.
Money (risk, payout, profit) rounds to the cent, half-up.
American odds display rounds to the nearest whole number (a -110/-110 parlay's true +264.46 shows as +264).
Decimal odds display to 4 decimal places; implied probability to 1 decimal place.

Syncing the cold line...

The Cold Line

Rounding rules

All math runs at full precision; rounding happens only when a number is displayed.

Money (risk, payout, profit) rounds to the cent, half-up.

American odds display rounds to the nearest whole number (a -110/-110 parlay's true +264.46 shows as +264).

Decimal odds display to 4 decimal places; implied probability to 1 decimal place.