Fractional, Decimal and American Odds

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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:

In Other News
1 of 230

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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