Fractional, Decimal and American Odds
Here is a conversion table to help you identify how the different odds formats relate to each other.
Columns in black are odds against, those in blue are odds on.
| Fractional | Decimal | US | Fractional | Decimal | US | Fractional | Decimal | US | Fractional | Decimal | US |
| evens | 2.0 | 100 | Evens | 2.0 | 100 | 6/1 | 7.0 | 600 | 1/6 | 1.167 | -600 |
| 21/20 | 2.05 | 105 | 20/21 | 1.952 | -105 | 13/2 | 7.5 | 650 | 2/13 | 1.154 | -650 |
| 11/10 | 2.1 | 110 | 10/11 | 1.909 | -110 | 7/1 | 8.0 | 700 | 1/7 | 1.143 | -700 |
| 6/5 | 2.2 | 120 | 5/6 | 1.833 | -120 | 15/2 | 8.5 | 750 | 2/15 | 1.133 | -750 |
| 5/4 | 2.25 | 125 | 4/5 | 1.8 | -125 | 8/1 | 9.0 | 800 | 1/8 | 1.125 | -800 |
| 11/8 | 2.375 | 137 | 8/11 | 1.727 | -137 | 17/2 | 9.5 | 850 | 2/17 | 1.118 | -850 |
| 6/4 | 2.5 | 150 | 4/6 | 1.667 | -150 | 9/1 | 10.0 | 900 | 1/9 | 1.111 | -900 |
| 13/8 | 2.625 | 162 | 8/13 | 1.615 | -162 | 10/1 | 11.0 | 1000 | 1/10 | 1.1 | -1000 |
| 7/4 | 2.75 | 175 | 4/7 | 1.571 | -175 | 11/1 | 12.0 | 1100 | 1/11 | 1.091 | -1100 |
| 15/8 | 2.875 | 187 | 8/15 | 1.533 | -187 | 12/1 | 13.0 | 1200 | 1/12 | 1.083 | -1200 |
| 2/1 | 3.0 | 200 | 1/2 | 1.5 | -200 | 14/1 | 15.0 | 1400 | 1/14 | 1.071 | -1400 |
| 85/40 | 3.125 | 212 | 40/85 | 1.471 | -212 | 16/1 | 17.0 | 1600 | 1/16 | 1.063 | -1600 |
| 9/4 | 3.25 | 225 | 4/9 | 1.444 | -225 | 18/1 | 19.0 | 1800 | 1/18 | 1.056 | -1800 |
| 5/2 | 3.5 | 250 | 2/5 | 1.4 | -250 | 20/1 | 21.0 | 2000 | 1/20 | 1.05 | -2000 |
| 11/4 | 3.75 | 275 | 4/11 | 1.364 | -275 | 22/1 | 23.0 | 2200 | 1/22 | 1.045 | -2200 |
| 3/1 | 4.0 | 300 | 1/3 | 1.333 | -300 | 25/1 | 26.0 | 2500 | 1/25 | 1.04 | -2500 |
| 10/3 | 4.333 | 333 | 3/10 | 1.3 | -333 | 33/1 | 34.0 | 3300 | 1/33 | 1.03 | -3300 |
| 7/2 | 4.5 | 350 | 2/7 | 1.286 | -350 | 50/1 | 51.0 | 5000 | 1/50 | 1.02 | -5000 |
| 4/1 | 5.0 | 400 | 1/4 | 1.25 | -400 | 66/1 | 67.0 | 6600 | 1/66 | 1.015 | -6600 |
| 9/2 | 5.5 | 450 | 2/9 | 1.222 | -450 | 80/1 | 81.0 | 8000 | 1/80 | 1.013 | -8000 |
| 5/1 | 6.0 | 500 | 1/5 | 1.2 | -500 | 100/1 | 101 | 10000 | 1/100 | 1.01 | -10000 |
| 11/2 | 6.5 | 550 | 2/11 | 1.182 | -550 |
To convert fractional odds to decimal divide the first number by the 2nd and add 1, eg 11/4 = 11 divided by 4 + 1 = 3.75.
To convert decimal odds to fractions is not so easy, but subtract 1 from the decimal amount and you will learn to recognize the fractional part.
To convert US odds to decimals:
Odds against – Add 100 and divide by 100, eg 250 +100 divided by 100 = 3.5
Odds on – remove the minus sign, then divide 100 by US odds and add 1, eg 100 divided by 275 = 0.3636
To convert decimal odds to US odds:
Odds against – subtract 1 and multiply by 100, eg 5.0 becomes 400
Odds on – subtract 1 and divide 100 by the result then stick a minus in front of it, eg 100 divided by 0.2222 = 450 so 1.2222 becomes -450.
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All results for the 48,094 Betfair markets traded are here and the charts are here.
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