Free Mortgage Calculator Widget

Last updated: August 2026

The quick answer: One line of HTML: <script src="https://calculatorme.co/widgets/mortgage.js"></script> — paste it into any page that allows scripts and the calculator appears.

Use the Mortgage Calculator Widget below — modify the values and click Calculate to preview your payment.

1. Customize Your Widget
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2. Live Preview

3. Copy Your Embed Code

Why Add a Mortgage Calculator to Your Website?

A mortgage calculator is one of the highest-engagement tools a real estate, personal finance, or home services website can offer. It keeps visitors on your page longer, makes your content more useful, and is a proven way to earn links and shares. This widget is built for that purpose:

  • Free forever — no account, no trial, no watermark.
  • Fast — a single lightweight iframe (~40 KB) with no trackers or scripts of its own.
  • Mobile-ready — fully responsive on phones, tablets, and desktop.
  • Private — calculations happen in the visitor's browser; nothing is collected.
  • Always current — updates and fixes on our side apply automatically to your site.

How to Embed on Popular Platforms

PlatformMethod
WordPress (Block Editor)Add a Custom HTML block and paste the iframe code.
WordPress (Widget Area)Add a Custom HTML widget and paste the code.
WixAdd an Embed HTML element and paste the code.
BloggerAdd an HTML/JavaScript gadget or paste into post HTML view.
Webflow / SquarespaceUse the Embed block and paste the code.
Any HTML sitePaste the iframe wherever you want the calculator.

No plugins are required. If you prefer a taller or shorter widget, adjust the height attribute in the iframe code (default 560).

What the Widget Calculates

The widget uses the standard fixed-rate amortization formula — the same one used by our full mortgage calculator:

M = P × [ r(1 + r)^n ] / [ (1 + r)^n - 1 ]

Visitors enter home price, down payment, interest rate, and term (30/20/15/10 years), with optional property tax and home insurance. They instantly see their total monthly payment, principal & interest split, total interest over the loan, loan amount, and payoff date.

Frequently Asked Questions

Is the mortgage calculator widget free to use?
Yes, the widget is completely free for any website, blog, or business. There is no signup, no limit on usage, and no ads shown to your visitors. We ask only that you keep the small attribution link in the widget footer.
How do I embed the mortgage calculator on my WordPress site?
In the WordPress block editor, add a Custom HTML block and paste the embed code, or use the iframe in a widget area. No plugin is required. The widget is fully responsive and will stretch to fit any column width.
Does the widget work on mobile devices?
Yes. The widget is fully responsive and renders correctly on phones, tablets, and desktop. It scales to the width of its container and stacks the input fields on narrow screens.
Can I customize the widget title and default values?
Yes. Use the options on this page to set a custom title and default home price, down payment, interest rate, and term. The generator produces an embed URL with those settings baked in, so the widget opens pre-filled for your visitors.
Will the widget slow down my website?
No. The widget is a single lightweight iframe (about 40 KB total) that loads lazily and does not block your page rendering. It has no external scripts, trackers, or cookie banners, so it will not affect your Core Web Vitals.

Note: The widget is provided free of charge for informational purposes. Mortgage calculations are estimates and do not constitute financial advice.

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Widget Quick Facts

  • Free for any website — no signup, no ads.
  • One iframe, ~40 KB, no tracking scripts.
  • Works in WordPress, Wix, Blogger, and plain HTML.
  • Calculations run entirely in the visitor's browser.
  • Includes optional property tax and home insurance.