How to Work Out a Bet: Calculate Betting Odds, Returns and Payouts
Researched and drafted with AI assistance from published sources; published by LokeNessiSport Editorial Team · Last updated: 7 November 2026
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To work out a bet, convert the odds to decimal and multiply by your stake: return = stake × decimal odds, and profit = return − stake. A £10 bet at 3.00 returns £30, which is £20 profit plus your £10 back. Fractional odds convert by dividing the fraction and adding 1 (2/1 becomes 3.00); American odds by dividing by 100 and adding 1 for a plus price (+200 becomes 3.00), or dividing 100 by the number and adding 1 for a minus price (−150 becomes 1.67). The rest of this page applies those two sums to accumulators, Asian handicap quarter lines and each-way bets, with every step shown.
Most people who search for how to work out a bet are not asking a hard question. They want one number: if this comes in, what lands in my account? The reason it feels hard is that betting slips quietly mix three different quantities — stake, profit and return — and use the word "win" for at least two of them.
This page is the arithmetic and nothing else. It will not tell you whether a bet is any good; that is a different calculation entirely, and there is a link to it at the bottom. What it will do is let you work out the exact return on any single, accumulator, Asian handicap or each-way bet before you place it, in about fifteen seconds, on paper.
18+. Betting carries a negative expected return by design. Knowing what a bet pays is not the same as knowing it is worth placing.
Stake, profit, return: three words, three numbers
Stake is what you hand over. Profit is what you make on top. Return is what comes back, and it includes your stake.
That third number is where nearly every argument about a betting slip starts. A £10 bet at 3.00 returns £30 and profits £20. If someone tells you they "won £30", they may mean either. Bookmaker slips almost always show the return, so the figure on screen is bigger than what you actually gained — by exactly your stake.
Two sums cover every single bet you will ever place with decimal odds:
- Return = stake × odds
- Profit = stake × (odds − 1)
Everything else on this page is those two sums wearing a different hat.
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Three odds formats, one underlying number
Decimal, fractional and American odds all describe the same price. Convert whichever one you are shown into decimal and the sums above do the rest.
Fractional to decimal: divide the fraction and add 1. So 11/4 is 11 ÷ 4 = 2.75, plus 1, which is 3.75. The fraction is telling you the profit per unit staked; the "add 1" puts your stake back in.
American to decimal: a positive number is the profit on a 100 stake, so +275 is 275 ÷ 100 = 2.75, plus 1, which is 3.75 again. A negative number is the stake needed to profit 100, so -250 is 100 ÷ 250 = 0.40, plus 1, which is 1.40.
The same six prices in all three formats, with what a £10 stake returns:
- 2/5 = 1.40 = −250: returns £14.00, profit £4.00
- 1/2 = 1.50 = −200: returns £15.00, profit £5.00
- 1/1 (evens) = 2.00 = +100: returns £20.00, profit £10.00
- 6/4 = 2.50 = +150: returns £25.00, profit £15.00
- 11/4 = 3.75 = +275: returns £37.50, profit £27.50
- 5/1 = 6.00 = +500: returns £60.00, profit £50.00
The currency is irrelevant. Replace the pound signs with whatever you actually deposit in and every figure holds.
The same arithmetic is why the bookmaker you use matters: the identical £10 bet returns £30 at 3.00 and £32 at 3.20, with nothing about the selection changed. Compare two or three prices before you place a bet — two sportsbooks we link to are Thunderpick and VVegas, where available in your country — and see how to compare sports betting odds for the method.
Accumulators multiply the odds — and the margin
An accumulator multiplies the decimal odds of every leg together. Four legs at 2.00 each give 2.00 × 2.00 × 2.00 × 2.00 = 16.00, so £10 returns £160.
The part the returns figure hides is that the bookmaker's mark-up multiplies too. Suppose — purely as an illustration, because real margins vary by book and by market — that each leg comes from a book carrying 5% of margin. Then the combined book on a four-fold is 1.05 to the power of four.
Legs each priced at 2.00, with a £10 stake and an illustrative 5% margin on every leg:
- 1 leg: combined odds 2.00, returns £20.00; combined book 105.0%, expected loss on stake 4.8%
- 2 legs: combined odds 4.00, returns £40.00; combined book 110.3%, expected loss 9.3%
- 4 legs: combined odds 16.00, returns £160.00; combined book 121.6%, expected loss 17.7%
- 6 legs: combined odds 64.00, returns £640.00; combined book 134.0%, expected loss 25.4%
- 8 legs: combined odds 256.00, returns £2,560.00; combined book 147.7%, expected loss 32.3%
To be exact about what the expected-loss figure is: it is 1 minus (1 ÷ the combined book). It is not a prediction about your bets. It is what the price structure costs you on average, before any judgement about the selections enters into it. The 5% assumption is mine and is there to make the shape visible — swap in the margin you actually measure and the shape does not change, only the steepness.
The eight-fold pays 256 times your stake and costs roughly a third of it in structural margin. That is the trade, stated plainly. More on the selections themselves in the accumulator guide and accumulator strategy.
Quarter-ball Asian lines split your stake in half
Asian handicap lines ending in .25 or .75 are two bets in one, and this is where returns confuse people most. A -0.25 line puts half your stake on 0 and half on -0.5.
Take £20 on Team A at -0.25, priced 1.95. That is £10 on the 0 line and £10 on the -0.5 line.
How the three possible results settle:
- A wins: the £10 on 0 returns £19.50 and the £10 on −0.5 returns £19.50 — £39.00 back, +£19.00 on £20.
- Draw: the £10 on 0 is void and refunded (£10.00 back); the £10 on −0.5 loses — £10.00 back, −£10.00 on £20.
- A loses: both halves lose — £0.00 back, −£20.00.
The draw line is the whole point of the quarter line: you lose half your stake rather than all of it. A -0.75 line works the same way, splitting between -0.5 and -1.0, which means a one-goal win gives you a half-win: £19.50 from the -0.5 half plus £10 refunded from the void -1.0 half, so £29.50 back and £9.50 profit on £20.
The market itself, and why the research likes it, is covered in Asian handicap explained. The stake-refund logic also drives draw no bet.
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Each-way is two bets, and the place part is where money quietly leaks
An each-way bet is a win bet and a place bet of the same size. A "£10 each-way" costs £20. The win part settles at full odds; the place part settles at a fraction of those odds, and both the fraction and the number of places paid are set by the bookmaker for that specific market. Read them off the slip. Do not assume them, and do not assume they match another book's.
Worked example, with the place terms stated as an assumption rather than a fact: £10 each-way at 11/4 (3.75 decimal), place terms of one fifth the odds. One fifth of 11/4 is 11/20, which is 0.55, so the place part settles at decimal 1.55.
How the £20 outlay settles in each case:
- Wins: win part £37.50 plus place part £15.50 — £53.00 back, +£33.00.
- Places only: win part £0 plus place part £15.50 — £15.50 back, −£4.50.
- Neither: £0.00 back, −£20.00.
Look at the middle line. Your selection placed, the slip shows a payout, and you are still down £4.50. That row is the single most misread outcome in betting, and it is pure arithmetic — no bad luck involved.
What can still change the number after you have placed
The sums above assume the bet is settled as struck. Several routine events change that: a match abandoned, a runner withdrawn after the market was priced, two selections tying for a place, or a price the bookmaker considers palpably wrong. Each has its own effect, and a voided leg inside an accumulator is usually set to 1.00 rather than losing the whole slip.
Each bookmaker publishes its own settlement rules for these cases, and they differ, so read them before you rely on a calculated return. The refund logic behind a voided stake is the same one that drives draw no bet, and the Champions League guide shows how one knockout final settled across six different markets.
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The honest limit of all this
Working out the return tells you the size of the prize. It says nothing whatsoever about whether the price is fair, and it is worth being blunt about how far the gap runs in the wrong direction.
Tadgh Hegarty and Karl Whelan's work on bookmaker margins, listed on Whelan's research page and published in Applied Economics in 2025, is summarised there as showing "how to estimate bookmaker margins and why loss rates on the average bet are higher than the usual calculation suggests" (read again on 7 November 2026). In other words, even the standard margin sum flatters the market. The return figure on your slip flatters it a great deal more.
If you want the calculation that actually decides whether a bet is worth placing, that is expected value, and it is a different page: the step-by-step version is how to calculate the value in a bet and the concept is unpacked in expected value explained. The stake-sizing question that follows it is in bankroll management.
Betting is entertainment with a price attached. 18+ only. Set deposit and time limits before you start, never chase a loss, and if it stops being fun there is free confidential help at BeGambleAware, your national helpline, and in our responsible gambling resources.
Next step
For how odds formats and implied probability fit together, read how to read sports betting odds; for what the margin costs on long-running markets, outright betting explained; or browse every guide from the sports betting hub.
Disclosure: this page contains affiliate links. If you sign up through them we may earn a commission, at no extra cost to you, and that commission can influence which providers we feature.
Sources
- Whelan's research page (karlwhelan.com)
Frequently Asked Questions
How do you calculate betting odds into a payout?
Convert the odds to decimal and multiply by your stake. Decimal odds already include the stake, so 10 at 3.00 returns 30. Fractional odds become decimal by dividing the fraction and adding 1, so 2/1 is 3.00. American odds become decimal by dividing a plus price by 100 and adding 1, or dividing 100 by a minus price and adding 1, so +200 is 3.00 and -150 is about 1.67.
What is the difference between return and profit on a bet?
Return is everything that comes back to you, including your original stake. Profit is what you gained on top of it. A ten pound bet at decimal odds of 3.00 returns thirty pounds and profits twenty. Bookmaker slips usually display the return, so the number on screen is always larger than what you actually made, by exactly the amount you staked.
How do I convert fractional odds into a payout?
Divide the fraction and add one to get decimal odds, then multiply by your stake. Eleven to four becomes 11 divided by 4, which is 2.75, plus 1, giving 3.75. A ten pound stake therefore returns thirty seven pounds fifty, of which twenty seven pounds fifty is profit.
Why did I lose money on a bet that placed?
Because an each-way bet costs double what you think you staked, and the place part settles at only a fraction of the odds. If the place part returns less than the total outlay, a placed selection still leaves you down. This is arithmetic rather than bad luck, and it is why the place fraction and the number of places paid are worth reading before you place the bet.
Does an accumulator give better value than singles?
It gives a bigger prize, not better value. Multiplying the odds also multiplies the bookmaker's margin, so the structural cost compounds with every leg you add. The prize grows faster than the margin does, but the share of your stake lost to the price structure grows steadily as the slip gets longer.
What happens to the return if one leg of my accumulator is void?
Commonly a voided leg is settled at odds of 1.00 and the accumulator continues on the remaining legs, so the slip does not collapse but the potential return falls. The exact treatment is set out in your bookmaker's settlement rules, which vary, so check theirs rather than assuming.