try
=SUMPRODUCT((E1:E21-F1:F21))
or
=SUM(E:E)-SUM(F:F)
--
Don Guillett
SalesAid Software

"jenniss" wrote in message
...
what formula do i put for column m = column k minus column

i have tried to do it by put the curser on the colmn so it highlightes all
the fields but this results in having the answer in row m1 and doesnt
update
all the rows.