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Embed Our Mortgage Calculator on Your Site

Add a free mortgage calculator to your own website with a single line of code. Your visitors can work out their full monthly payment — principal and interest, property tax, homeowners insurance, PMI and HOA — without ever leaving your page.

The embed is free to use, with no sign-up and no cost, and it works on any site: WordPress, plain HTML, or any CMS that lets you paste an HTML snippet. It updates automatically whenever we improve the calculator, and it is fully responsive — it fits phone screens, sidebars and full-width content columns.

Live preview

This is exactly what your visitors will see. Try it: change the home price or the rate and the payment updates instantly.

Copy the code

Paste this snippet wherever you want the calculator to appear on your page:

<iframe src="https://www.sumkittool.com/embed/mortgage-calculator" width="100%" height="1790" frameborder="0" title="Mortgage Calculator by SumKitTool"></iframe>

How to add it to your site

WordPress

In the block editor, add a Custom HTML block where you want the calculator, paste the snippet above, and publish. In the classic editor, switch to the Text tab and paste it there.

Plain HTML

Paste the snippet directly into your page's HTML where the calculator should appear. No JavaScript files, stylesheets or setup needed — the iframe loads everything itself.

Any CMS

Most site builders (Squarespace, Wix, Webflow, Ghost and others) have an HTML or Embed block. Add one, paste the snippet, and save — the calculator appears on your published page.

Sizing the embed

The snippet sets the height to 1790 pixels, which fits the calculator in a content column about 640 pixels wide. If your column is narrower, the calculator stacks into a single column and needs more height: use a height of 2270 for a column around 400 pixels wide, or 2740 for a narrow sidebar around 320 pixels wide. The width is set to 100%, so the calculator always fills the space you give it.

The embed carries a small “Powered by SumKitTool” link at the bottom, which takes visitors to the full mortgage calculator on our site. Please keep the link in place — it is the only thing we ask in return for the free calculator, and it lets your visitors find our other 130+ free tools.

Estimates, not financial advice: the calculator gives estimates for planning and education. Loan, tax and insurance figures depend on the lender, insurer, location and personal circumstances, and they will differ from official quotes. Nothing on this site is financial, tax, legal or medical advice. Please read our Disclaimer for full details.

Last reviewed: 13 November 2026