- Maths reviewed by Josh Miller
- Tested by Diana Westfield
5/2, 3.50 and +250 are the same price. The CasinoCalcs betting odds chart lines up fractional, decimal and American odds with the implied chance and what £10 returns, for every common price from 1/5 to 100/1. Print it for the races or keep the page open. For an odd price the chart doesn’t list, type it into the free calculator above in any format.
Betting odds chart: 1/5 to 100/1
| Fractional | Decimal | American | Implied chance | Return on £10 |
|---|---|---|---|---|
| 1/5 | 1.20 | -500 | 83.3% | £12.00 |
| 2/9 | 1.222 | -450 | 81.8% | £12.22 |
| 1/4 | 1.25 | -400 | 80.0% | £12.50 |
| 2/7 | 1.286 | -350 | 77.8% | £12.86 |
| 3/10 | 1.30 | -333 | 76.9% | £13.00 |
| 1/3 | 1.333 | -300 | 75.0% | £13.33 |
| 4/11 | 1.364 | -275 | 73.3% | £13.64 |
| 2/5 | 1.40 | -250 | 71.4% | £14.00 |
| 4/9 | 1.444 | -225 | 69.2% | £14.44 |
| 1/2 | 1.50 | -200 | 66.7% | £15.00 |
| 8/15 | 1.533 | -188 | 65.2% | £15.33 |
| 4/7 | 1.571 | -175 | 63.6% | £15.71 |
| 8/13 | 1.615 | -162 | 61.9% | £16.15 |
| 4/6 | 1.667 | -150 | 60.0% | £16.67 |
| 8/11 | 1.727 | -138 | 57.9% | £17.27 |
| 4/5 | 1.80 | -125 | 55.6% | £18.00 |
| 5/6 | 1.833 | -120 | 54.5% | £18.33 |
| 10/11 | 1.909 | -110 | 52.4% | £19.09 |
| Evens | 2.00 | +100 | 50.0% | £20.00 |
| 11/10 | 2.10 | +110 | 47.6% | £21.00 |
| 6/5 | 2.20 | +120 | 45.5% | £22.00 |
| 5/4 | 2.25 | +125 | 44.4% | £22.50 |
| 11/8 | 2.375 | +138 | 42.1% | £23.75 |
| 6/4 | 2.50 | +150 | 40.0% | £25.00 |
| 13/8 | 2.625 | +162 | 38.1% | £26.25 |
| 7/4 | 2.75 | +175 | 36.4% | £27.50 |
| 15/8 | 2.875 | +188 | 34.8% | £28.75 |
| 2/1 | 3.00 | +200 | 33.3% | £30.00 |
| 9/4 | 3.25 | +225 | 30.8% | £32.50 |
| 5/2 | 3.50 | +250 | 28.6% | £35.00 |
| 11/4 | 3.75 | +275 | 26.7% | £37.50 |
| 3/1 | 4.00 | +300 | 25.0% | £40.00 |
| 10/3 | 4.333 | +333 | 23.1% | £43.33 |
| 7/2 | 4.50 | +350 | 22.2% | £45.00 |
| 4/1 | 5.00 | +400 | 20.0% | £50.00 |
| 9/2 | 5.50 | +450 | 18.2% | £55.00 |
| 5/1 | 6.00 | +500 | 16.7% | £60.00 |
| 11/2 | 6.50 | +550 | 15.4% | £65.00 |
| 6/1 | 7.00 | +600 | 14.3% | £70.00 |
| 13/2 | 7.50 | +650 | 13.3% | £75.00 |
| 7/1 | 8.00 | +700 | 12.5% | £80.00 |
| 15/2 | 8.50 | +750 | 11.8% | £85.00 |
| 8/1 | 9.00 | +800 | 11.1% | £90.00 |
| 9/1 | 10.00 | +900 | 10.0% | £100.00 |
| 10/1 | 11.00 | +1000 | 9.1% | £110.00 |
| 11/1 | 12.00 | +1100 | 8.3% | £120.00 |
| 12/1 | 13.00 | +1200 | 7.7% | £130.00 |
| 14/1 | 15.00 | +1400 | 6.7% | £150.00 |
| 16/1 | 17.00 | +1600 | 5.9% | £170.00 |
| 20/1 | 21.00 | +2000 | 4.8% | £210.00 |
| 25/1 | 26.00 | +2500 | 3.8% | £260.00 |
| 33/1 | 34.00 | +3300 | 2.9% | £340.00 |
| 40/1 | 41.00 | +4000 | 2.4% | £410.00 |
| 50/1 | 51.00 | +5000 | 2.0% | £510.00 |
| 66/1 | 67.00 | +6600 | 1.5% | £670.00 |
| 100/1 | 101.00 | +10000 | 1.0% | £1010.00 |
Return includes the £10 stake. Implied chance = 1 ÷ decimal odds, before taking out the bookmaker’s margin.
Reading it in the betting shop
Fractional odds tell you profit per unit staked: 7/4 means £7 profit for every £4. Decimal odds tell you the total return per £1, stake included: 2.75. American odds are built around £100 or $100: +175 means £175 profit on £100, while −200 means you’d stake £200 to win £100. Same horse, three dialects.
The column worth learning is the implied chance. At 4/1 the price says 20%. If you think the horse wins more often than one race in five, the price is generous; if not, it isn’t. That’s the whole idea behind value betting. Our implied probability calculator does the same for a whole market and strips out the margin.
Odds-on, evens and the long shots
Below evens the numbers squeeze together. 4/6, 8/13 and 4/7 look similar, but £10 returns £16.67, £16.15 and £15.71. At the other end, 33/1 and 50/1 feel like different worlds, yet the implied chances are 2.9% and 2.0%. Most punters overrate their long shots: a book of 50/1 shots usually adds up to well over 100% once you count every runner.
Need to convert a price that isn’t here, like 85/40 or −135? Use the odds converter. To work out a full bet with each way terms or multiple selections, the bet calculator handles it.
Common odds in decimal
The prices people search for most, with the decimal version, the implied chance and what a £10 bet returns. 1/2 odds in decimal is 1.50: a £10 bet wins £5 and returns £15. 13/8 is 2.625, which most bookmakers show as 2.63.
| Fraction | Decimal | Implied chance | £10 returns |
|---|---|---|---|
| 1/2 | 1.50 | 66.7% | £15 |
| 2/9 | 1.22 | 81.8% | £12.22 |
| 8/11 | 1.73 | 57.9% | £17.27 |
| 10/11 | 1.91 | 52.4% | £19.09 |
| 11/10 | 2.10 | 47.6% | £21 |
| 5/4 | 2.25 | 44.4% | £22.50 |
| 13/8 | 2.63 | 38.1% | £26.25 |
| 11/4 | 3.75 | 26.7% | £37.50 |
| 9/2 | 5.50 | 18.2% | £55 |
| 50/1 | 51.00 | 2.0% | £510 |
What does 50/1 mean? For every £1 you stake you win £50, and you get your £1 back as well, so £51. The bookmaker rates it about a 2% chance, before its margin.
What does evens mean in betting?
Evens (even money, 1/1, decimal 2.00) means you win the same as you stake: £10 wins £10 and returns £20. It’s a 50% implied chance. A price shorter than evens, like 4/6, is odds-on: you win less than you stake. Longer than evens, like 6/4, is odds-against. An even money bet in a casino is the same idea: red or black at roulette pays 1 to 1, though the zero means it wins less than half the time.
Want the returns for your own stake at every price? The betting ready reckoner does it for win and each way bets.
Odds tell you the price, not the result. BeGambleAware.org is free and confidential if betting stops being fun.