One way:

=IF(COUNT(A1),A1*3.4%+0.20,"")

In article ,
"owlie" wrote:

Hi, I want to create a formula that only works if I have a figure in a cell

eg.,

A1 1.70
B1 =sum(a1*3.4%)+0.20

But if A1 was blank, I don't want any figure in B1.

Thanks for any help