RoobetFree tool
Parlay Calculator
Add your selections to calculate the combined odds, potential return, potential profit and implied probability of an accumulator (parlay).
Accumulator (parlay) calculator
Build your bet slip and see the return if every active selection wins.
Instant calculation
- Potential return
- US$54.00
- Potential profit
- US$44.00
- Combined decimal odds
- 5.400
- Active selections
- 3
- Implied probability
- 18.52%
Return includes your stake. Void selections count at odds of 1.00. If every selection is void, the stake is returned.
Assumes independent selections, no boosts, taxes or commission. Related outcomes and each-way bets need different settlement rules.
Calculated on your device. No sign-up.
How a parlay works
A parlay (also called an accumulator or acca) combines several selections into one bet. The odds multiply together, so the potential payout grows quickly — but every leg must win, which makes it far less likely to land than any single bet.
To find the combined odds, multiply each selection's decimal odds. The implied probability is 1 ÷ combined odds. This reflects the price, including the bookmaker's margin; it is not the true probability of winning. This calculator excludes correlated selections, such as same-game accumulators.
Worked example
Three selections at 1.50, 2.00 and 1.80, $10 stake.
Combined odds = 1.50 × 2.00 × 1.80 = 5.40.
Payout = 10 × 5.40 = $54.00 ($44 profit). Implied probability ≈ 1 ÷ 5.40 = 18.5%.
Frequently asked questions
How are parlay odds calculated?
Multiply the decimal odds of every selection together. Three legs at 1.50, 2.00 and 1.80 give combined odds of 1.50 × 2.00 × 1.80 = 5.40. Your payout is the stake times the combined odds.
What is the payout of a parlay?
Payout = stake × combined odds. A $10 stake at combined odds of 5.40 returns $54.00, for a $44.00 profit. All selections must win for the full quoted return. A void selection is usually removed from the accumulator; settlement depends on the operator and market rules.
Why are parlays riskier than single bets?
An accumulator normally needs every selection to win. Multiplying decimal odds gives the combined price; its implied probability is 1 divided by that price. This is not a prediction of the true chance of winning. Correlated selections, such as same-game bets, need separate pricing.