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Calculating the difference between monthly figures

  1. #1
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    Calculating the difference between monthly figures

    Hi all,

    I have an educational table looking at improvements in students learning and need help calculating improvements in years and months.

    I have figures such as 9 years and 9 months, as 9.09 improving to 10 years 4 months 10.04. I need to work out how to calculate the formula to work out that the change is 7 months.

    Is there a certain format that would help and what function do I need to work out the improvement or change?

    Any help very much appreciated!!!! xxx

  2. #2
    Forum Expert mrice's Avatar
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    Re: Calculating the difference between monthly figures

    Try this

    =(INT(LEFT(B1,FIND(".",B1)-1))-INT(LEFT(A1,FIND(".",A1)-1)) ) * 12 + INT(RIGHT(B1,LEN(B1)-FIND(".",B1))) - INT(RIGHT(A1,LEN(A1)-FIND(".",A1)))

    Assuming that 9.09 is in A1 and 10.04 is in B1
    Martin

  3. #3
    Forum Guru shg's Avatar
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    Re: Calculating the difference between monthly figures

    Another way:

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  4. #4
    Forum Expert bebo021999's Avatar
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    Re: Calculating the difference between monthly figures

    Assuming A1 is first, A2 is second duration of time in yy.mm format
    =(INT(A2)-INT(A1))*12+(MOD(A2,INT(A2))-MOD(A1,INT(A1)))*100

  5. #5
    Forum Expert bebo021999's Avatar
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    Re: Calculating the difference between monthly figures

    My solution in #4 calculate months only,i.e 7 months, 14 months,...
    If you want to format as 0 years 7 months, 1 years 2 months, try this:
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