Can GF be used to build a calculator?

I'm trying to see if Gravity Forms has a solution for a client of mine. The client needed a lot of web edits and updates to their Wordpress site. When I dug in, I quickly noticed that the previous developer hard coded a lot of the content (instead of using WP as is should be used).

I came in and rebuilt the theme, moved the content to the dashboard where the pages can be edited easily.

Unfortunately, this messed up a web form they had which was a calculator. I had my developer try to fix it, but the calculator is not generating $$$ amounts in the results page.
Here's a link to the calculator- http://bit.ly/o8qbOB

Long story short- can I use Gravity Forms to rebuild this calculator? I have all the old php code, but I'm pretty weak w/ php- can only make simple edits.

Any ideas?

Thanks Chris-

I'm waiting to hear back from my developer. If he can't fix it, I need to find someone who can customize a GF and get this going. Unfortunately, I'm gonna have to come out of pocket, but hopefully things will work out.

Is there a place I can post a job for customization?