Free Calculator Widgets for Your Website

Add any of our 45 calculators to your blog, real-estate site, school page or business website in a minute. No ads, no sign-up, and the data stays current.

How it works

Open a calculator below and click Embed under its title.
Choose a light or dark theme and copy the code.
Paste it into your page's HTML. The widget resizes to fit automatically.

<iframe src="https://toolknack.com/embed/mortgage-calculator" title="Mortgage Calculator" width="100%" height="760" style="border:0;max-width:960px" loading="lazy" data-toolknack></iframe>
<p style="font-size:13px;margin:4px 0 0"><a href="https://toolknack.com/mortgage-calculator">Mortgage Calculator</a> by ToolKnack</p>
<script async src="https://toolknack.com/embed.js"></script>

Everyday Calculators

Unit Converters

Travel & Visa

Study Abroad

Environment

Frequently asked questions

Are the widgets really free?

Yes. There's no sign-up, no fee and no ads inside the widget. We only ask that you keep the small credit link below it.

Will the widget slow down my site?

No. It loads lazily in an iframe, so it doesn't block your page, and it runs entirely in your visitor's browser.

Does it work with WordPress, Wix and Squarespace?

Yes. Paste the code into a Custom HTML block (WordPress), an Embed/HTML element (Wix, Squarespace) or any page that accepts HTML. If your platform removes scripts, the widget still works; it just keeps a fixed height.

Are the numbers kept up to date?

Yes. Tax rates, limits and exchange rates update on our side, so the widget on your site always uses current data.