I can help you out with a complete solution if you wanted to send me a private message with your contact information.

I can also help you here getting you started if you were up to learning how to do it yourself.

Questions I have are:
Is there more than just that form in the document? If it is only that form then I would recommend changing to Excel.

Do you do the data entry direct into the form or is there a mail merge/import function that populates large chunks of the data?

If it stays in Word, I would likely recommend changing to Content Controls for the data values entry and then use macros to do the calculations.

__________________
Andrew Lockton
Chrysalis Design, Melbourne Australia