A combined price tells you what a winning slip would return under its stated terms. It does not tell you whether the selections are sensible, likely to win or worth their price. Start by separating three numbers: the stake you risk, the total return if the bet wins, and the profit left after subtracting that stake.
Decimal odds include your stake
With decimal odds, total return equals stake multiplied by the quoted price, and the total includes the original stake, as Betfair's explanation of decimal odds confirms. In our hypothetical example, a 10-unit stake at 2.50 returns 25 units if successful: 10 units returned stake and 15 units profit.
A unit here is simply a teaching amount, not a recommended stake or currency. The same arithmetic works with a one-unit example, so there is no need to increase the amount to understand it.
A worked three-selection example
For this hypothetical standard cross-match accumulator, assume three accepted decimal prices of 1.50, 2.00 and 2.40, with every selection winning and no settlement adjustments. The combined price is 1.50 × 2.00 × 2.40 = 7.20, giving the following calculation for a five-unit stake.
| Stage | Calculation | Amount |
|---|---|---|
| Initial stake | Amount risked | 5.00 units |
| After first winning leg | 5.00 × 1.50 | 7.50 units |
| After second winning leg | 7.50 × 2.00 | 15.00 units |
| Final total return | 15.00 × 2.40 | 36.00 units |
| Profit | 36.00 minus 5.00 | 31.00 units |
The stages explain the multiplication; they are not separate cash payments available after each match. In this example, the slip still requires the complete winning combination before the final return is due.
Adding the three prices would give 5.90, which is not the combined price in this example. Calling the 36-unit return a 36-unit profit would also overstate the gain because five of those units were yours already.
DEC, FRAC and US describe the same price
Fractional odds describe profit relative to stake, while decimal odds include stake; converting a fraction to decimal means dividing its numerator by its denominator and adding one, according to Betfair's odds guide. Thus our hypothetical 5/2 becomes 3.50, not 2.50, before it enters a decimal calculation.
Positive US odds show profit for a 100-unit stake, while negative US odds show the stake needed for 100 units profit, as DraftKings' format explanation illustrates. The 100-unit convention is a ratio, not an instruction to stake that amount.
| DEC | FRAC | US | Total return | Profit |
|---|---|---|---|---|
| 2.50 | 3/2 | +150 | 25 units | 15 units |
| 1.50 | 1/2 | -200 | 15 units | 5 units |
These format equivalences match DraftKings' worked comparison; our smaller stakes simply scale its arithmetic. Use the odds converter to practise switching formats, and check that the same stake still produces the same return.
Displayed rounding can also explain a small difference between your calculator and the bookmaker: Paddy Power says it displays two decimal places but calculates returns from the underlying odds in its odds and rounding rules. Do not silently treat every discrepancy as rounding; check the accepted slip and exact selections first.
What an example return does not establish
- Availability: a saved site price is not confirmation that the same quote remains available to you.
- Chance: a larger payout number is not evidence of a more likely result. Use the separate probability explanation.
- Same-game pricing: do not apply this standalone-price calculation to linked selections from one match. Read builders and correlation instead.
- Settlement: the worked example excludes voids, deductions and other adjustments. Check the rules attached to the actual slip.
A practical calculation check
Enter the hypothetical stake and decimal prices into the acca calculator to practise the arithmetic, not to obtain bookmaker acceptance. Write down the stake, combined decimal price, total return and profit separately, then confirm that every quoted leg belongs to the same proposed slip.
Finally, read how our picks work before treating a displayed category as a recommendation. A correct payout calculation can accompany an uncertain selection, and calculating a return does not require placing a bet.