Switching from Umbraco to Drupal

Hi All,

I have built this contractor calculator http://www.churchill-knight.co.uk/calculator/  for my client, and it's been there for a while on their website. The client is happy, but I am wondering how would you approach to create similar using Drupal as I have another project that potentially would need to be re-created using Drupal 8. 

Any ideas thoughts are appreciated 

Many Thanks