I have a calculation system developed using HTML, CSS and JavaScript (as it will be too strenuous on the system to create dynamic calls, that is, once an item updates, the calculator values change, this is where JS comes into it) that will look great and function exceptionally well.
The system will will be developed first to get the look and feel correct, and once complete, will be converted to a shortcode format for WordPress that will allow you to add it directly to any page you choose.
Please message so we can discuss further,
Daniel Larson