Help with Frontpage Forms

Frontpage Forms
Can I create a form with multiple fields so that when an entry is made in a couple fields a calculation will appear in another field? or is done somehow somewhere else.
I really didn’t want to create a database since I only need the data collected to be sent in a text format.
Example. field 1: date, field 2: date, field 3: Auto calc of # of days, field 4: $ amount/day, field 5: auto total. down near the bottom is a field with auto calc of all the totals fields

If needmore info, I can email the form.

Thanks