Pick a calculator, match it to your brand, and copy the snippet. It drops into any website, no code required, and it resizes itself to fit.
Paste it into any page's HTML where you want the calculator to appear.
Set a brand color above and the calculator picks it up. It resizes itself to fit your layout.
WordPress, Squarespace, Webflow, Wix or hand-written HTML. If it accepts an HTML block, it works.
On paid plans, a visitor can send their numbers to you for a follow-up conversation.