The Mathematics
Fractional odds describe profit relative to stake. At 5/2, every £2 staked wins £5 profit if the selection succeeds. Decimal odds include the returned stake, so 5/2 becomes 5 ÷ 2 + 1 = 3.50. Multiplying a £10 stake by 3.50 produces £35 total return, of which £25 is profit. Do not add another £10 after using decimal odds: that would count the stake twice. A losing single returns zero, and the overall result is minus the amount staked.
Decimal odds = numerator ÷ denominator + 1
Winning return = stake × decimal odds
Winning profit = return − stake
Losing return = £0; losing result = −stake
Worked Example
Enter £10 in Stake, select Fractional, and enter 4/1 in Odds. Decimal odds are 5.00, total return is £10 × 5 = £50, and profit is £50 − £10 = £40. Select Decimal and enter 5.00 to reproduce the same result. If this horse loses, the return is £0 and the loss is £10; the widget's displayed £50 is conditional on a win.
How do I use the single bet inputs?
Choose the odds format before typing the price. In Fractional mode, use a slash, such as 11/4, 4/6 or 1/1 for evens. In Decimal mode, type 3.75, 1.67 or 2.00 respectively. Decimal 1.67 is a rounded version of 4/6, so a small payout difference can arise from entering a rounded price rather than the original fraction. The calculator uses the numbers you supply; it does not retrieve a bookmaker quote or detect the starting price.
The Stake field is the whole outlay for this one cash bet. Entering £5 means risking £5, not £5 on each horse or each way. Read Total Return as the amount paid back following an ordinary win and Profit as the gain after recovering the stake. To check a slip, use the accepted price recorded when the bet was placed. A later price visible on a racecard does not necessarily replace that contracted price.
How does a single compare with a double or each way bet?
A single needs only its own selection to succeed. A double links two selections and pays only when both succeed, while two separate singles can return money from either winner. For a £10 total budget split into two £5 singles at 3/1 and 2/1, both winning return £20 + £15 = £35, a £25 profit. Putting that same £10 budget into a double returns £120 if both win but £0 if either loses. These are different outcome patterns, not evidence that one structure is always better value.
An each way single is two stakes, one win and one place. A £10 each way instruction normally costs £20 and cannot be represented by this win-only single form. Use the each way calculator to separate the possible win and place-only payouts. Odds alone do not tell you which option offers positive expected value; that would require credible estimates of win and place chances as well as the actual terms.
Which settlement changes are outside this single calculator?
Ordinary day-of-race non-runner terms generally refund the stake on a withdrawn selection, but ante-post rules can leave that stake lost. If a different horse is withdrawn, a Rule 4 may reduce winnings on your eventual winner. At £10 and 4/1 with a 25p deduction, the £40 profit becomes £30, giving a £40 total return. That adjustment belongs in the separate Rule 4 tool, because this form has no deduction control.
A two-horse dead heat for first divides the original £50 return at £10 and 4/1 into £25. The resulting profit is £15 after subtracting the full £10 outlay, not £20. Free bets with stake not returned, exchange commission, payout caps and best odds guaranteed can also alter the amount received. This page models an ordinary cash-stake win and does not automatically apply these conditions. Check the operator's settled slip when the arithmetic differs.
Popular questions about this calculator
How much does a £10 single at 5/2 return?
A winning £10 single at 5/2 returns £35 including the £10 stake. Profit is £25. The equivalent decimal odds are 3.50. If the selection loses, nothing is returned and the loss is the original £10, not the potential profit shown before the event.
Does Total Return include my single stake?
Yes. Total Return includes the returned stake on a winning ordinary cash bet. Profit excludes it. A £10 winner at 4/1 therefore has £50 return and £40 profit. Adding the stake again to £50 would overstate the payout by £10.
How do I enter evens in the single calculator?
Enter 1/1 in Fractional mode or 2.00 in Decimal mode. Evens means winning profit equals the stake, so £10 returns £20 with £10 profit. This single form expects a fraction with a slash rather than the word evens in Fractional mode.
Can a short-priced single still make a profit?
Yes, on an ordinary win at decimal odds above 1.00. A £12 stake at 1/2 converts to decimal 1.50 and returns £18, giving £6 profit. Short prices reduce profit per pound, but they do not prove that the selection is safe or correctly priced.
What happens if my single selection is a non-runner?
Under ordinary non-runner terms the single is void and the stake is refunded. Ante-post bets can use all-in terms and lose instead, unless a non-runner concession applies. The form has no refund state, so do not treat its winning payout as a withdrawal settlement.
Can I use this form for each way singles?
Use the each way calculator instead. Each way splits a unit stake into equal win and place bets and normally doubles the total cost. This single form calculates only the win payout and has no place fraction, number of paid places or place-only return.
Are decimal odds the horse's actual chance of winning?
No. Reciprocal decimal odds give an odds-implied percentage, not a measured true chance. Prices can contain a bookmaker margin and market judgement. A decimal price of 5.00 implies 20% before any margin adjustment, but does not establish a calibrated 20% chance for the horse.
Does the single calculator include exchange commission?
No. It shows gross back-bet return without fees. An exchange can charge commission on net market winnings under its own account terms. This form also does not calculate lay liability, which is a different exposure from a conventional back-bet stake.
Why is the bookmaker payout different from this single result?
Check the accepted odds, stake, Rule 4, dead heat, promotional conditions and payout limit. A free-bet stake may not be returned. The calculator does not read your account or apply these rules automatically, so its ordinary winning figure may differ from a legitimately adjusted settlement.
Does increasing my single stake improve the odds?
No. At a fixed accepted price, doubling the cash stake doubles both the possible profit and the amount at risk. It does not change the selection's chance. Set an affordable spending limit before using the potential return to compare scenarios, and do not increase stakes to chase losses.
Official rules and further reading
These operator references explain bet structures and settlement rules. They are not endorsements, and the terms attached to your accepted bet take precedence. Worked amounts on this page are illustrative arithmetic, not live odds or promised outcomes. Only gamble money you can afford to lose; a returns tool does not make a bet safe.