I’d like to add a custom calculator we developed ( http://ai.arup.com/resilience-calculator/) to a Hubspot landing page. Right now, it lives on an internal server as a collection of HTML files, so it could be as simple as copying the files into a subfolder on the new server and linking to it on the site. Or we could embed the code in the pre existing HTML/php files.
If the calculator is composed entirely of HTML, CSS, and JavaScript files, you should be able to copy the code into an HTML module on your HubSpot landing page. While I’m not sure how the calculator is written, you should be able to simply add the code to an existing page or create a new custom HTML template to hold the calculator and page. I’d be happy to dig deeper into this with some more detail, as well.