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The Overround?

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  • January 17, 2008 at 22:31 #6302
    thejackal
    Member
    • Total Posts 50

    Can someone please explain the overround system to me?

    For example when someone says the book is 108%…what is this and how is i calculated?

    Cheers!

    January 17, 2008 at 22:52 #136092
    Avatar photorobert99
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    • Total Posts 899

    The theoretical overround is calculated by adding up all the prices of the horses in a race, converted to percentages. If the percentage sum exceeds 100 then there is an overround ie in theory an amount the bookmaker will take in when paying out only £100.

    A price is converted to a percentage by the formula
    100 divided by (odds +1).
    So, for example, a horse at 2/1 is 100/(2=1) = 33%.

    January 17, 2008 at 23:08 #136093
    Avatar photoGingertipster
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    • Total Posts 34707

    Take a look at my Question To The Racing Media thread Jackal. The first, 3rd and last pages may be of particular interest. Including how to make your own 100% book.

    Value Is Everything
    January 17, 2008 at 23:23 #136095
    garstonf
    Participant
    • Total Posts 30

    To calculate the over round simply add up the stake for each price in the market that will return 100 points.
    For example
    Odds stake return
    5/2___28___98
    3/1___25__100
    6/1___14___98
    7/1___12.5_100
    7/1___12.5_100
    9/1___10__100
    16/1___6__102
    total_108
    If the bookie laid the prices above to the figures stated he would make 8% on the race. His book is 8% over round.

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