You are missing a set of parenthesis

=IF(ISERROR((A1-B1)/A1),"",(A1-B1)/A1)




--
HTH

Sandy
In Perth, the ancient capital of Scotland
and the crowning place of kings


Replace @mailinator.com with @tiscali.co.uk


"Wanna Learn" wrote in message
...
Hello this is my original formula =(A1-B1)/A1. This is Ok except that
sometimes I get #DIV/0!. so I tried to fix the formula to this
=IF(ISERROR(A1-B1)/A1,"",(A1-B1)/A1).. What I'm I missing? thanks in
advance