How could I create this with a progress bar

I have a couple of table fields

1. Member ID
2. Modules - Training course sections
3. Modules Completed

What I would like to do is has the progress bar to show how far they are along in the training course.
I think the logic I would need to do it is:
a. Number of Modules
b. Number of Modules complete
(so some how work out the % of the bar for Total - Complete)

But how would I get this to work with a progress bar
Any thoughts or suggestions would really be welcome.