# Modify a Formula

C

#### carl

Hi.

I use this formula:

=COUNTIF(I5:I40;TRUE)/COUNTA(I5:I40)

I would like to modify it so that the value I put in Cell A1 (eg 100) will
change the formula to this:

=COUNTIF(I5:I100;TRUE)/COUNTA(I5:I100)

N

#### Niek Otten

Check the INDIRECT() function in HELP

T

#### T. Valko

Try this...

=COUNTIF(I5:INDEX(I:I,A1),TRUE)/COUNTA(I5:INDEX(I:I,A1))

Note that if A1 is an empty cell the formula will calculate the entire
column I.