In Excel 2003 I have created a database to show progressive weight loss (or
gain). I would like the result displayed in column F only after a number is
entered in column E. The following works until I have a blank row. Would I
have to adjust the formula each time a blank row is encountered?

=IF(E2=0,"",E1-E2)

E F
1 150 ___ (starting weight)
2 149 ___ (formula beginning here)
3 blank row
4 blank row
5 148 ___