Hi, there!
We have gone through your task and attached pdf file. We can develop a calculator on your Homepage.
We work with HTML, CSS, Bootstrap, Php, Javascript, Jquery, CMS Wordpress, Joomla, Opencart, Prestashop, etc. Have a look at our works - https://www.freelancer.com/u/Webln .
Looking forward for your response to discuss this calculator in detail.
With regards,
WebIn team!