Build energy saving calculator for Wix website that I can put on a landing page.

I have a wix website and I would like to build a energy savings calculator that shows how much energy can be saved by replacing 50 watt halogen light globes with 4.25 watt led lights.

Here is an example of something similar I found on another site.
http://primsal.com/product/brilliance-5w-led-gu10-550-hpf/

Thanks