odds conversion

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What is the formula for converting Fractional odds to American?
and Decimal to American?

<TABLE cellPadding=0 width="51%" align=center><TBODY><TR bgColor=#f0f0f0><TD class=style58 align=middle>Fractional </TD><TD class=style58 align=middle>Decimal </TD><TD class=style58 align=middle>American </TD></TR><TR><TD class=style58 align=middle width="35%">1/5</TD><TD class=style58 align=middle width="33%">1,20</TD><TD class=style58 align=middle width="32%">-500</TD></TR><TR><TD class=style58 align=middle width="35%">2/9</TD><TD class=style58 align=middle width="33%">1,22</TD><TD class=style58 align=middle width="32%">-450</TD></TR><TR><TD class=style58 align=middle width="35%">1/4</TD><TD class=style58 align=middle width="33%">1,25</TD><TD class=style58 align=middle width="32%">-400</TD></TR><TR><TD class=style58 align=middle width="35%">2/7</TD><TD class=style58 align=middle width="33%">1,28</TD><TD class=style58 align=middle width="32%">-350</TD></TR><TR><TD class=style58 align=middle width="35%">3/10</TD><TD class=style58 align=middle width="33%">1,30</TD><TD class=style58 align=middle width="32%">-333,30</TD></TR><TR><TD class=style58 align=middle width="35%">1/3</TD><TD class=style58 align=middle width="33%">1,33</TD><TD class=style58 align=middle width="32%">-300</TD></TR><TR><TD class=style58 align=middle width="35%">7/20</TD><TD class=style58 align=middle width="33%">1,35</TD><TD class=style58 align=middle width="32%">-285,70</TD></TR><TR><TD class=style58 align=middle width="35%">4/11</TD><TD class=style58 align=middle width="33%">1,36</TD><TD class=style58 align=middle width="32%">-275</TD></TR><TR><TD class=style58 align=middle width="35%">2/5</TD><TD class=style58 align=middle width="33%">1,40</TD><TD class=style58 align=middle width="32%">-250</TD></TR><TR><TD class=style58 align=middle width="35%">4/9</TD><TD class=style58 align=middle width="33%">1,44</TD><TD class=style58 align=middle width="32%">-225</TD></TR></TBODY></TABLE>
 

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simple

You divide in fractional 1st # by 2nd and you add 1 to get decimal line.
as far as American goes divide 100 by that negative and add 1 to get decimal.these are good for Favorite lines(under 2.00 decimal or +100US).

If you convert underdog lines then divide by 100 the plus # (+100/100) and add 1 and you get decimal line..+100 equal to 2.00 decimal.
+200/100+1= 3 in decimal and so on.

From fractional to decimal..just divide the left # by the right.

5/2= 2.50 decimal
5/1=5.00 etc'
 

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For decimal odds ≥ 2: US = 100×(decimal-1)

For decimal odds < 2: US = -100/(decimal-1)
 

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Now if I want to convert Fraction to US, I know I can convert Fraction to Decimal and then to US. But is there a formula to convert it Fraction to US?
 

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