Again:  WHY THREE FORMS?

I can't think of any calculations that would *require* separate forms.
Insisting on separate forms makes you job much harder. What *business problem*
are you trying to solve? I'm sure there's a better way.

What are the calculations? Are you trying to store the calculated values in
the table? If so here's my blurb on that practice:

Storing derived data such as this in your table accomplishes
three things: it wastes disk space; it wastes time (almost
any calculation will be MUCH faster than a disk fetch); and
most importantly, it risks data corruption. If one of the
underlying fields is subsequently edited, you will have data
in your table WHICH IS WRONG, and no automatic way to detect
that fact.

Just redo the calculation whenever you need it, either as a
calculated field in a Query or just as you're now doing it -
in the control source of a Form or a Report textbox.

            John W. Vinson [MVP]