How are parlay odds calculated?

Convert every leg to decimal odds and multiply them together. Three legs at 1.90, 2.10 and 1.75 give 1.90 × 2.10 × 1.75 = 6.98 combined decimal odds.

What happens if one leg is voided?

A voided leg is treated as decimal odds of 1.00, so it drops out of the multiplication without cancelling the bet. The parlay then settles on the remaining legs at the reduced combined price.

Why is my real chance lower than the implied probability?

Each leg's price already includes the bookmaker's margin. Multiplying the legs multiplies the margin too, so a 6-leg parlay can carry several times the house edge of a single bet.

Does the calculator handle correlated selections?

No, and no simple calculator can. The maths assumes each leg is independent. Selections from the same game — a team to win plus that team's striker to score — are correlated, so the true combined chance differs from the multiplied estimate.

How many legs can I add?

Between 2 and 20. Beyond about 8 legs the combined implied probability usually falls below 1%, which the variance meter flags as extreme.

Parlay Calculator

Parlay odds are the product of every leg's decimal price. Add 2 to 20 selections below to see the combined odds, the payout, the chance all legs land, and the far larger chance that at least one of them does not.

Stake

Odds format (all)

Currency

Selections (3/20)

Leg 1 name (optional)
Odds
Leg 2 name (optional)
Odds
Leg 3 name (optional)
Odds

Combined decimal odds

6.98

Every active price multiplied together.

Potential payout

€69.83

Stake plus profit if every selection wins.

Potential profit

€59.83

Payout minus your stake.

Combined implied probability

14.32%

1 in 7.0

At least one selection loses

85.68%

The chance this bet does not pay out.

Total legs

Each added selection multiplies the ways this bet can fail.

Drop the riskiest selection

Removing the longest price (2.10) changes the combined odds to 3.32 and lifts the implied chance from 14.32% to 30.08%.

Variance ratingHigh variance

Lower complexityHigh varianceVery high varianceExtreme variance

Every added leg multiplies the ways this bet can fail. Expect long losing runs between wins.

This assumes independent outcomes. Selections from the same match or the same team are correlated, so the real chance can be meaningfully different — usually worse for you than the number above, sometimes better. Bookmaker margin is already inside each price, so the combined implied probability is higher than the true combined chance.

The link contains your selections, so anyone who opens it sees the same calculation. No account and no saved data.

What each output means

Combined decimal odds — every active leg multiplied together. Voided legs contribute 1.00 and therefore nothing.
Potential payout — stake × combined odds, paid only if every remaining leg wins.
Potential profit — the payout minus your stake.
Combined implied probability — 1 ÷ combined odds. The chance the whole bet lands, according to the prices.
At least one selection loses — 100% minus the combined probability. This is how often the bet returns nothing.
Drop the riskiest selection — how the combined chance improves if you remove the single longest price.

The formulas

Multi-leg bet

combined odds = odds₁ × odds₂ × … × oddsₙ

payout = stake × combined odds

profit = payout − stake

combined probability = 1 ÷ combined odds × 100

at least one loses = 100% − combined probability

voided leg → decimal odds 1.00

The combined-probability line is only valid when the legs are independent of one another.

Worked examples

Example 1 — a four-leg football parlay

Legs at 1.80, 2.20, 1.60 and 2.50 give 1.80 × 2.20 × 1.60 × 2.50 = 15.84. A €20 stake returns €316.80 for €296.80 profit. The combined implied probability is 1 ÷ 15.84 = 6.31%, so the bet fails 93.69% of the time.

Example 2 — the same parlay with one leg voided

If the 2.20 leg is voided, the price becomes 1.80 × 1.60 × 2.50 = 7.20. The same €20 stake now returns €144.00, and the implied chance rises from 6.31% to 13.89%.

Combined odds and implied chance when every leg is priced at 1.91 (−110).
Legs	Combined odds	Implied chance	Fails
2	3.65	27.40%	72.60%
3	6.97	14.35%	85.65%
4	13.31	7.51%	92.49%
6	48.54	2.06%	97.94%
8	177.10	0.56%	99.44%
10	646.03	0.15%	99.85%

Common mistakes

Adding odds instead of multiplying them. Two legs at 2.00 give 4.00, not 4.00 through addition of anything — the multiplication is what makes the price grow so fast.
Assuming a big price means good value. Longer combined odds mean more accumulated margin, not more edge.
Ignoring correlation. Same-game legs are not independent. Treat the combined probability as an estimate, not a fact.
Judging a parlay by one result. With a 7% chance of landing, several consecutive losses is the normal outcome, not bad luck.

Frequently asked questions

Last reviewed: 24 August 2026. Formulas on this page are checked against the unit test suite that powers every bet.ing calculator.