# Need to calculate about 8 textboxes on a form by adding 4 and dividing by the sum of the other four

Need to calculate about 6 textboxes on a form by adding 4 and dividing by the sum of the other four

Some of the textboxes are blank and causing a #Num! error.  I am currently using this formula:

=CDbl(Nz((CDbl(Nz([vol1],0))+CDbl(Nz([vol2],0))+CDbl(Nz([vol3],0))/=CDbl(Nz([time1],0))+CDbl(Nz([time2],0))+CDbl(Nz([time3],0))+CDbl(Nz([time4],0))
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Commented:
you got extra = there?

=CDbl(Nz((CDbl(Nz([vol1],0))+CDbl(Nz([vol2],0))+CDbl(Nz([vol3],0))/=CDbl(Nz([time1],0))+CDbl(Nz([time2],0))+CDbl(Nz([time3],0))+CDbl(Nz([time4],0))

quick try:

``````=CDbl(Nz((CDbl(Nz([vol1],0))+CDbl(Nz([vol2],0))+CDbl(Nz([vol3],0))/CDbl(Nz([time1],0))+CDbl(Nz([time2],0))+CDbl(Nz([time3],0))+CDbl(Nz([time4],0))
``````
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Commented:
you may also consider to put brackets in your calculation:

=( CDbl(Nz((CDbl(Nz([vol1],0))+CDbl(Nz([vol2],0))+CDbl(Nz([vol3],0)) ) / ( CDbl(Nz([time1],0))+CDbl(Nz([time2],0))+CDbl(Nz([time3],0))+CDbl(Nz([time4],0)) )
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Author Commented:
Sorry but I get #Num! and #Div/0! errors on both of the fixes above
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Author Commented:
Was getting sums on the ones that had numbers in them but #Num! errors on the blank textbox sums  (without the extra = in the calc)
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CIOCommented:
Try using Val and Nz:

``````=(Val(Nz([vol1]))+Val(Nz([vol2]))+Val(Nz([vol3]))+Val(Nz([vol4]))) / (Val(Nz([time1]))+Val(Nz([time2]))+Val(Nz([time3]))+Val(Nz([time4])))
``````
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Author Commented:
Still need help. . . have not solved this issue yet
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CIOCommented:
Or, if sum of time can be zero:

``````=(Val(Nz([vol1]))+Val(Nz([vol2]))+Val(Nz([vol3]))+Val(Nz([vol4]))) / IIf(Val(Nz([time1]))+Val(Nz([time2]))+Val(Nz([time3]))+Val(Nz([time4]))=0, 1, Val(Nz([time1]))+Val(Nz([time2]))+Val(Nz([time3]))+Val(Nz([time4])))
``````
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Author Commented:
Val and Nz give me the same result as with CDbl and Nz - I get sums on several and the ones that the sums are 0 on either the vol or time side, I get the #Num! error.  So the issue seems to be that I am getting an error on the division with 0 on either side (vol or time) with the #Num! error
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CIOCommented:
That can't be true, as Val returns 0 for Nz(Null) and for any string. Also, the IIf divides be 1 if the sum of time is zero.

So something in your end is not as you think it is, like different naming of fields or controls. Also, the name of the control mut be different of any of the control uses in the calculation.
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Author Commented:
Gustav Perfection!!!

You solved it!!
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CIOCommented:
Great!
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