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Formula for exact penny increments, eliminate Excel's precision variances

  1. #1
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    Formula for exact penny increments, eliminate Excel's precision variances

    I've been searching the net for the last hour to find an answer to this but I can't.

    Sorry if I'm asking a stupid question but this is killing me.

    I'm building a pretty big matrix in excel 2007 and I need to copy down -100 +.01 to create a table that goes from -100, -99.99, -99.98....through to +100.00.

    So I simply put in a formula.... but when I copy the formula down about 10 numbers down or at irregular intervals the equation fails and turns, say 99.9 into 99.899999999. I need it to be exactly 99.9 as it is used in a IF formula.

    Does anyone know how to stop this happening ??
    Last edited by StuNVA; 01-17-2011 at 11:31 PM.

  2. #2
    Administrator JBeaucaire's Avatar
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    Re: Formula for exact penny increments, eliminate Excel's precision variances

    Put -100 in A1.

    Put this formula in A2, then copy A2 down as far as needed:

    =ROUND(A1+0.01,2)
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  3. #3
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    Re: Formula for exact penny increments, eliminate Excel's precision variances

    Excellent, thank you very much, I knew it would be something simple.

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