What is a parlay bet?

A parlay (also called an accumulator or acca) is a single bet that combines two or more selections. All selections must win for the bet to pay out. The odds multiply together, resulting in a much higher potential return than single bets.

How are parlay odds calculated?

Parlay odds are calculated by multiplying the decimal odds of every selection together. For example, three legs at 2.00, 1.80, and 2.50 give combined decimal odds of 2.00 × 1.80 × 2.50 = 9.00.

What is the maximum number of legs in a parlay?

Most bookmakers allow parlays of 2–20 legs, though limits vary. Our calculator supports up to 10 legs, which covers the vast majority of practical parlays.

What does implied probability mean in a parlay?

The implied probability of a parlay is the combined chance of every selection winning. It equals the product of the individual probabilities (1 ÷ decimal odds for each leg). For example, two legs each at 2.00 (50% each) give a 25% combined probability.

What is the difference between a parlay and an accumulator?

Parlay and accumulator (acca) are the same type of bet — a multi-selection bet where all legs must win. 'Parlay' is the US term; 'accumulator' or 'acca' is the UK/European equivalent. The maths is identical.

WBookie

Parlay / Accumulator Calculator

Calculate combined parlay / accumulator odds, total payout, and implied probability for up to 10 selections.

Your Selections

Enter each selection and its odds. Add up to 10 legs.

Stake Amount (£ / $ / €)

Enter at least 2 selections with valid odds and click Calculate to see your parlay payout.

Odds Format Guide

Decimal — most common in Europe. E.g. 2.50 means £1 returns £2.50 total.

Fractional — UK traditional. E.g. 3/2 means £3 profit on a £2 stake.

American — US moneyline. +150 means £150 profit on £100; -200 means bet £200 to win £100.

Parlay Calculator — How It Works

A parlay (known as an accumulator or acca in the UK) is a multi-selection bet where every leg must win for the overall bet to pay out. The reward for this added risk is significantly higher odds — each selection's odds are multiplied together.

The Formula

For a parlay with legs at decimal odds o₁, o₂, … oₙ:

Combined odds = o₁ × o₂ × … × oₙ
Total payout = Stake × Combined odds
Profit = Total payout − Stake
Implied probability = (1/o₁) × (1/o₂) × … × (1/oₙ) × 100

Tips for Parlay Betting

Keep legs to 3–5 for a balance of higher odds and realistic probability of winning.
Avoid heavy favourites with near-even odds — the small multiplier barely compensates for the added risk.
Check for same-game parlay restrictions with your bookmaker, as some legs may be correlated and subject to restrictions.