Accumulator Calculator — Acca Bet Returns & Odds
Calculate acca returns for any number of selections. Enter the odds for each leg to see your combined accumulator odds, total return, and potential profit.
Odds format
Saved for all betting calculators
Amount you want to wager
How many legs in your acca
e.g. -110 or +150
e.g. -110 or +150
e.g. -110 or +150
e.g. -110 or +150
Total Return
$130.32
Total Profit
$120.32
Combined Odds
+1203
Implied Probability
7.67%
| Selection | Odds | Implied Prob. | Single Return |
|---|---|---|---|
| 1 | -111 | 52.63% | $19.00 |
| 2 | -111 | 52.63% | $19.00 |
| 3 | -111 | 52.63% | $19.00 |
| 4 | -111 | 52.63% | $19.00 |
Last reviewed · How we check our calculators
How it differs: this calculator takes decimal odds, as UK and European books quote an acca. For the same bet in American odds, as US sportsbooks quote a parlay, use the Parlay Calculator.
How to Use the Accumulator Calculator
To use the accumulator calculator, begin by entering your stake — the amount you plan to bet on the entire acca. Then select the number of selections (legs) from the dropdown, anywhere between 2 and 8. Finally, enter the odds for each selection in the format you picked with the Odds format switch — American, decimal, or fractional.
The examples below use decimal odds, the standard format of UK and European bookmakers such as Bet365, William Hill, Paddy Power, and Betfair. They represent the total return per unit staked, including your original stake. For example, odds of 1.90 mean a $10 bet returns $19 ($9 profit + $10 stake). Odds of 2.50 mean a $10 bet returns $25.
As you type, the results show your combined accumulator odds, total return, total profit, and a breakdown of each selection's individual implied probability and single-leg return. This breakdown helps you identify which leg is the biggest risk in your accumulator.
The Formula
An accumulator works by multiplying the decimal odds of every selection together. The maths is simple:
- Combined odds = selection 1 odds × selection 2 odds × … × selection N odds
Example (4-fold at 1.90 each): 1.90 × 1.90 × 1.90 × 1.90 = 13.03 - Total return = stake × combined odds
Example: $10 × 13.03 = $130.32 - Total profit = total return − stake
Example: $130.32 − $10 = $120.32 - Implied probability (%) = (1 ÷ combined odds) × 100
Example: (1 ÷ 13.03) × 100 ≈ 7.67%
The implied probability of each individual leg is calculated the same way: 1 ÷ decimal odds × 100. Odds of 1.90 imply a 52.6% probability; odds of 2.00 imply exactly 50%; odds of 3.00 imply 33.3%.
The combined probability of the whole acca winning is the product of all individual probabilities. Four legs each with a 52.6% chance gives 0.526 × 0.526 × 0.526 × 0.526 ≈ 7.67% — a roughly 1-in-13 shot.
Practical Examples
Example 1 — 4-Fold Saturday Football Acca
This is the most common type of accumulator placed by UK bettors — picking four football matches on a Saturday afternoon.
- Stake: $10
- Man City to win: 1.40
- Arsenal to win: 1.80
- Liverpool to win: 1.70
- Chelsea to win: 2.10
- Combined odds: 1.40 × 1.80 × 1.70 × 2.10 ≈ 9.00 (8.9964)
- Total return: $89.96 | Profit: $79.96
- Implied probability: 11.1%
A $10 stake returns $90 if all four teams win — a compelling payout for a small stake. The catch is that a single draw or upset kills the whole bet.
Example 2 — 2-Fold (Double)
A double is the simplest form of accumulator — just two selections. It is often used by bettors who want a multiplied return without the risk of a long acca.
- Stake: $20
- Selection 1: 2.00 (evens)
- Selection 2: 2.00 (evens)
- Combined odds: 2.00 × 2.00 = 4.0000
- Total return: $80.00 | Profit: $60.00
- Implied probability: 25.0%
Example 3 — 5-Fold Each-Way Comparison
Advanced bettors sometimes compare a 5-fold at shorter odds against a 3-fold at higher odds to see which offers better expected value. Here is a 5-fold at an average of 1.75 per leg:
- Stake: $5
- Five selections at 1.75 each
- Combined odds: 1.75^5 ≈ 16.4131
- Total return: $82.07 | Profit: $77.07
- Implied probability: 6.1%
Why UK Bettors Love Accumulators
Accumulators are extraordinarily popular in the UK and Ireland, particularly on football. The appeal is obvious: a small stake can return life-changing money if all legs win. Bookmakers also love accumulators because the built-in margin (overround) compounds across every leg. A bookmaker with a 5% margin on each selection will have a compound margin of roughly 22% on a 4-fold — meaning the expected return on an acca is significantly lower than placing each bet individually. Use this calculator to understand the true odds and probability before placing your acca.
Frequently Asked Questions
An accumulator (commonly shortened to acca) is a single bet that combines multiple selections. All selections must win for the bet to pay out — if even one leg loses, the whole accumulator loses. The appeal is that the odds multiply together, turning small stakes into large potential returns. In the UK and Ireland, accumulators are most popular on Saturday Premier League and Championship football, but they are used across all sports.
An accumulator and a parlay are exactly the same bet — the only difference is terminology. "Accumulator" (or "acca") is the British and European term, while "parlay" is the American term. Both involve linking multiple selections together so the winnings from each selection roll onto the next. The maths is identical: multiply all the decimal (or converted American) odds together to get the combined odds.
There is no single right answer, but most experienced bettors keep accas to 3–5 legs at most. Each additional leg reduces your probability of winning significantly while also compounding the bookmaker's margin. A 2-fold (double) with two strong selections can often offer better value than a 7-fold with weaker legs padding the payout. If you want a bigger payout from a small stake, consider increasing your stake on a shorter acca rather than adding risky legs.
If a selection in your accumulator is postponed, cancelled, or settled as void, most bookmakers will remove that leg and recalculate the acca with one fewer selection. For example, a 5-fold acca where one game is postponed becomes a 4-fold acca. Your potential return decreases, but you do not lose the bet outright. Rules vary between bookmakers, so always check the terms and conditions before placing large accumulator bets.
No — decimal odds and fractional odds represent the same probability in different formats. Decimal odds (e.g. 2.50) show the total return per $1 staked, including your stake. Fractional odds (e.g. 6/4) show your profit relative to your stake, excluding the return of your original bet. To convert fractional to decimal: divide the first number by the second and add 1. So 6/4 = 6÷4 + 1 = 2.50. Most modern UK bookmakers display decimal odds by default because they are easier to work with in accumulator calculations.
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