How are parlay odds calculated?

Parlay odds are calculated by converting each leg's odds to decimal format and multiplying them together. For example, two legs at -110 (1.909 decimal each) combine to 1.909 × 1.909 = 3.645 decimal, or about +265 American odds. Your payout is your stake multiplied by the combined decimal odds.

What is the payout on a 4-team parlay?

The payout depends on the odds of each leg. For a 4-team parlay with all legs at -110 (standard spread/total odds), a $100 bet pays approximately $1,330. At even odds (+100), a 4-team parlay pays $1,600. The more legs and the higher the individual odds, the larger the potential payout.

What happens if one leg of my parlay pushes?

If one leg pushes (ties), most sportsbooks remove that leg from the parlay and recalculate the payout based on the remaining legs. For example, a 4-team parlay with one push becomes a 3-team parlay. Some sportsbooks may have different rules, so always check your book's parlay push policy.

How do I convert American odds to decimal odds?

For positive American odds (e.g. +150): divide by 100 and add 1, so +150 = 2.50 decimal. For negative American odds (e.g. -110): divide 100 by the absolute value and add 1, so -110 = 1.909 decimal. Decimal odds represent the total return per dollar wagered.

What is implied probability in a parlay?

Implied probability is the estimated chance of your parlay hitting, derived from the combined odds. It's calculated as (1 ÷ combined decimal odds) × 100. For a 3-leg parlay at -110 per leg, the implied probability is about 14.4%. Note that implied probability includes the sportsbook's vig (margin), so the true probability of winning is slightly higher.

Are parlays a good bet?

Parlays generally carry a higher house edge than straight bets because the vig compounds across each leg. However, they allow for large payouts from small stakes. Many sharp bettors use 2-3 leg parlays with correlated outcomes for value, while avoiding large parlays (5+ legs) where the sportsbook's edge grows significantly.

What is the difference between a parlay and a teaser?

A parlay combines multiple bets at their existing odds, while a teaser allows you to adjust the point spread in your favor for each leg — in exchange for a lower payout. For example, a 6-point NFL teaser moves each spread by 6 points. Both require all legs to win, but teasers offer lower payouts for the improved lines.

Can I parlay moneyline and spread bets together?

Yes, most sportsbooks allow you to mix different bet types in a parlay — including moneylines, point spreads, totals (over/under), and player props. The only restriction is typically that you cannot parlay correlated bets from the same game (though same-game parlays are often allowed with adjusted odds).

Parlay Calculator

Odds Format

Wager ($)

Parlay Legs

Total Payout

$911.17

Profit: $811.17

Combined Odds

American

+811

Decimal

9.11

Fractional

811/100

Implied Probability

10.97%

Leg Breakdown

Individual leg conversions and implied probabilities

#	Odds	American	Decimal	Prob.
1	-110	-110	1.91	52.4%
2	-110	-110	1.91	52.4%
3	+150	+150	2.50	40.0%

Payout Scaling

How payouts scale by number of legs (at your average odds per leg)

Legs	Payout	Win Prob.
2	$436.25	22.9%
3current	$911.17	11.0%
4	$1903.12	5.3%
5	$3974.96	2.5%
6	$8302.31	1.2%
7	$17340.65	0.6%
8	$36218.61	0.3%
9	$75648.14	0.1%
10	$158002.77	0.1%
11	$330013.10	0.0%
12	$689283.13	0.0%
13	$1439673.86	0.0%
14	$3006980.35	0.0%
15	$6280541.09	0.0%

How Parlay Betting Works

Combine multiple bets for larger payouts

A parlay (also called an accumulator or multi-bet) combines two or more individual bets into a single wager. All selections must win for the parlay to pay out. In exchange for the higher risk, parlays offer significantly larger payouts than placing each bet individually.

Combine 2–15 legs

Multiplied odds

Bigger payouts

Implied probability

3 odds formats

Payout scaling

Core Formula

Parlay Odds = Leg₁ × Leg₂ × … × LegN (all in decimal)

For example, three -110 favorites (1.909 decimal each) combine to 6.96 decimal odds (+596 American) — turning a $100 bet into a $696 payout. Each leg you add multiplies the combined odds, creating exponentially larger potential payouts but lower win probability.

Parlay Odds Formula & Conversion

How to convert odds and calculate parlay payouts step by step

Step 1: Convert to Decimal Odds

All odds formats must be converted to decimal before combining. Decimal odds represent the total return per $1 wagered.

Positive American: (odds ÷ 100) + 1 → +150 = 2.50

Negative American: (100 ÷ |odds|) + 1 → -110 = 1.909

Fractional: (num ÷ den) + 1 → 3/2 = 2.50

Step 2: Multiply All Legs

Multiply the decimal odds of each leg together. This is the key difference from straight bets — parlay odds multiply, they don't add.

Example: 1.909 × 1.909 × 2.50 = 9.11 combined decimal

Step 3: Calculate Payout & Profit

Multiply your stake by the combined decimal odds to get the total payout. Subtract your stake for the profit.

Payout = $100 × 9.11 = $911.16

Profit = $911.16 − $100 = $811.16

Implied Probability = (1 ÷ 9.11) × 100 = 10.98%

Parlay Probability & House Edge

How implied probability and vig compound across legs

The implied probability of a parlay is the product of each leg's individual probability. Because sportsbooks bake vig (margin) into every leg, the house edge compounds with each leg you add.

Legs	Decimal Odds	American	$100 Payout	Win Prob.
2	3.64	+264	$364	27.4%
3	6.96	+596	$696	14.4%
4	13.30	+1,230	$1,330	7.5%
5	25.41	+2,441	$2,541	3.9%
6	48.53	+4,753	$4,853	2.1%
8	177.0	+17,600	$17,700	0.56%
10	645.4	+64,440	$64,540	0.15%

All legs at standard -110 odds (1.909 decimal). Actual payouts vary by leg odds.

The vig compounds: A single -110 bet has ~4.5% vig. A 3-leg parlay at -110 per leg has ~13% compounded vig, and a 5-leg parlay exceeds 20%. The bigger your parlay, the larger the sportsbook's built-in edge.

Implied Probability Formula

Parlay Probability = (1 ÷ Combined Decimal Odds) × 100

Common Parlay Mistakes to Avoid

Pitfalls that cost bettors money on parlays

Adding too many legs

Each leg reduces your win probability dramatically. A 2-leg parlay at -110 has a 27% chance; a 5-leg drops to under 4%. Stick to 2–3 legs for realistic win rates.

Ignoring the compounding vig

Sportsbooks take their margin on each leg. In a 4-leg parlay, you're paying vig four times. The implied probability always overstates the true probability — the gap grows with more legs.

Treating parlays as addition

Parlay odds multiply, they don't add. A 3-leg parlay at -110 each is not 3× the payout — it's approximately +596 combined. The exponential math is what makes parlays attractive but risky.

Not understanding push rules

If one leg pushes (ties), most books remove that leg and recalculate. A 4-team parlay with one push pays as a 3-team parlay. Always check your sportsbook's push policy.

Betting parlays as a strategy

Parlays are high-variance entertainment, not a sustainable edge. Sharp bettors limit parlay exposure and focus on positive expected value (+EV) single bets with proper bankroll management.

Worked Examples

Step-by-step parlay calculations for common scenarios

2-Leg Favorite Parlay

Leg 1: -110 (1.909 decimal)
Leg 2: -150 (1.667 decimal)
Combined: 1.909 × 1.667 = 3.18
Stake: $100
Payout: $318.18 | Profit: $218.18

3-Leg Mixed Parlay

Leg 1: -110 (1.909)
Leg 2: -110 (1.909)
Leg 3: +150 (2.500)
Combined: 9.11 decimal (+811)
$100 → $911 payout ($811 profit)

Underdog Parlay

Leg 1: +200 (3.00 decimal)
Leg 2: +300 (4.00 decimal)
Combined: 3.00 × 4.00 = 12.00
Stake: $25
Payout: $300 | Profit: $275

Heavy Favorite Parlay

Leg 1: -300 (1.333 decimal)
Leg 2: -250 (1.400 decimal)
Leg 3: -200 (1.500 decimal)
Combined: 2.80 decimal (+180)
$100 → $280 payout ($180 profit)

Frequently Asked Questions

Common questions and detailed answers

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Last updated Mar 28, 2026