Search calculator (time savings, cost savings, increase in sales ....)


I’m looking for a script for my site.
I would like to give my visit the possibility to calculate how much time and costs you can save and how much sales you can make when you take my service.
Here is an example of what I’m looking for:

There you can create different calculators. I am looking for a script which I can put on my server. And what I do not have to pay monthly.

I hope someone can help me.