Accumulator Calculator — Acca Bet Returns & Odds

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 decimal odds for each selection.

Decimal odds are the standard format used by 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.

Click Calculate Accato see 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.

An accumulator works by multiplying the decimal odds of every selection together. The maths is simple:

1. 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
2. Total return = stake × combined odds
   Example: £10 × 13.03 = £130.32
3. Total profit = total return − stake
   Example: £130.32 − £10 = £120.32
4. 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.

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
• Total return: £90.07 | Profit: £80.07
• Implied probability: 11.1%

A tenner 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 = 4.00
• Total return: £80 | Profit: £60
• Implied probability: 25%

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 ≈ 16.41
• Total return: £82.03 | Profit: £77.03
• 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.