Web Based Influencer Earning Calculator

I need something similar to the calculator on this page (https://grin.co/engagement-rate-calculator/#engagement-calculator) where people can enter their social media handles and email and it will calculate their engagement rate plus potential earnings.

There should also be a Facebook to enter in facebook friend count and Snapchat followers count

Submitted Info + social media info (name, engagement rate, etc) should be submitted to a database afterwards

This should be fully styled and responsive.