Fractional, Decimal and American Odds
- The TopTrap Greyhound Profit And Loss Account On Betfair - March 17, 2022
- Betfair Best Execution – 11 Requested & Filled At 320 - January 16, 2022
- BTB System e-book - March 13, 2015
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.
In 2021 TradeHost traded 7,937 Betfair UK, IE, US & AU horse racing and greyhound markets.
2022 saw TradeHost become even more profitable with 22,698 Betfair markets traded.
2023 less markets were traded – 17,459 – but a with a similar profit to 2022.
All trades and bets were streamed live on JuiceStorm TV which was was watched by 124,209 traders in 2022.
All results for the 48,094 Betfair markets traded are here and the charts are here.
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