You'll need to format the cells where you enter the lengths as text, then parse
the cells to convert them into inches, do your arithmetic, then convert the
result back to feet and inches in text.
To parse the length, assume that the first length is in B2, the second is in C2,
the result is in D2, and e2 and f2 are the numeric inches.
In E2:
=value(left(B2,SEARCH("-",B2,1)-1)) * 12 +
value(right(B2,len(B2)-SEARCH("-",B2,1)))
In F2:
=VALUE(LEFT(C2,SEARCH("-",C2,1)-1)) * 12 +
VALUE(RIGHT(C2,LEN(C2)-SEARCH("-",C2,1)))
In D2:
=TEXT((e2-f2)/12,"0") & "-" & TEXT(mod(e2-f2,12),"0.00")
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Have a look at David McRitchie's MVP site. The following is a direct link
to his 'Carpentry' page which contains several examples of calculations
involving feet and inches.
http://www.mvps.org/dmcritchie/excel/formula.htm#Carpentry
Regards, Dave
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Greeting from the Mississippi Gulf Coast!
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