>I am attempting to estimate how the size of the DBF will change if I add some fields. Suppose I want to add 3 fields to a table that has approximately 400,000 records:
>Field1 N 3,0
>Field2 L 1
>Field3 N 12,2
>
>Would it be correct to estimate that he DBF file will increase by 400000 x 16=6,400,000 (6.4MB)? (16 being the sum of new fields).
>And also, would be correct to assume that the size of FPT file will not change at all?

For the second, not always. It will recreate the fpt in the size to be expected after PACK MEMO, so it might be smaller. But it will leave the remnants of dbf and fpt on disc - if you are strapped for free disc space think of that.

HTH

thomas