Accumulator bets, also known as ‘accas’, ‘parlays’, or ‘multiples’, are a popular way to bet on multiple selections with a single stake. The appeal lies in the potential for significantly higher returns compared to individual bets, but understanding how the odds are calculated is crucial. This article breaks down accumulator calculations step-by-step.
What is an Accumulator Bet?
An accumulator combines several individual selections into one bet. To win, all your selections must be correct. The stake is fixed, but the potential payout increases exponentially with each correctly predicted outcome. The more legs (selections) you add, the higher the odds – and the risk!
Calculating Accumulator Odds: The Basics
The core principle is multiplying the odds of each individual selection together. Let’s illustrate with an example:
- Selection 1: Odds of 2.0 (1/1)
- Selection 2: Odds of 1.5 (3/2)
- Selection 3: Odds of 2.5 (5/2)
Total Accumulator Odds: 2.0 x 1.5 x 2.5 = 7.5
This means a £1 stake would return £7.50 (stake + £6.50 profit).
Formula for Accumulator Calculation
The general formula is:
Accumulator Odds = (Odds of Selection 1) x (Odds of Selection 2) x … x (Odds of Selection N)
Decimal vs. Fractional Odds
Most bookmakers display odds in decimal format, making calculations straightforward. If you encounter fractional odds (e.g., 5/1), convert them to decimal first:
Decimal Odds = (Numerator / Denominator) + 1
For example, 5/1 becomes (5/1) + 1 = 6.0
Calculating Potential Payout
Once you have the accumulator odds, calculating the potential payout is simple:
Potential Payout = (Accumulator Odds) x (Stake)
Using our previous example with a £10 stake:
Potential Payout = 7.5 x £10 = £75
Dealing with Non-Runners & Void Selections
If a selection in your accumulator is void (e.g., a horse withdraws from a race), the bet doesn’t automatically lose. Most bookmakers will ‘refund’ the stake for that leg and recalculate the odds based on the remaining selections. The accumulator then becomes a smaller accumulator.
Accumulator Calculators
Numerous online accumulator calculators are available. These tools automate the process, saving you time and reducing the risk of errors. Simply input your odds and stake, and the calculator will display your potential payout. Search for “accumulator calculator” on any search engine.
Important Considerations
- Risk: Accumulators are high-risk bets. Even one incorrect selection results in a loss.
- Value: Focus on finding value in each individual selection, rather than simply adding lots of selections.
- Bankroll Management: Stake responsibly and don’t risk more than you can afford to lose.
Understanding accumulator calculations empowers you to make informed betting decisions and maximize your potential returns. Remember to always gamble responsibly.


