Free Calculator Widgets for Your Website

Put any CalcNotebook calculator on your own site with one line of code — no developer, no account, no cost. The widget fills your container's width, resizes its own height, and works on every platform from WordPress to plain HTML.

1. Pick a calculator

2. Copy this one line into your page

<script async src="https://calcnotebook.com/embed.js" data-calc="mortgage-calculator"></script>

3. Live preview — exactly what your visitors will see

How to install

WordPress: add a "Custom HTML" block where you want the calculator, paste the line, publish.
Tilda: add block T123 (HTML code), paste the line.
Wix / Squarespace: add an "Embed HTML" / "Code" element, paste the line.
Plain HTML: paste the line anywhere inside <body> — the calculator appears exactly there.

The honest deal

The widgets are free with no traffic limits. In return, the small "Powered by CalcNotebook" line stays visible — that credit is the entire business model, so removing it breaks the deal (and our hearts). Your visitors' inputs are never collected: calculations run in their browser, the same privacy rule as everywhere on CalcNotebook.

Frequently asked questions

Is the calculator widget really free?

Yes — free for any website, personal or commercial, with no traffic limits. The only requirement is keeping the small "Powered by CalcNotebook" line visible.

Will the widget slow my site down?

No. The script loads asynchronously and the calculator lives in an isolated iframe that lazy-loads — your page speed and Core Web Vitals are unaffected.

Does it fit my design and mobile?

The widget takes the full width of whatever container you place it in and adjusts its own height automatically — it works in blog posts, sidebars and mobile layouts without any configuration.

Can I remove the "Powered by CalcNotebook" credit?

The credit line is what keeps the widgets free — please keep it. White-label versions without the credit are planned for the future.

Is any visitor data collected?

The widget follows the same rule as our site: everything a visitor types is calculated in their browser and never sent to us. The iframe does not read anything from your page.

Always up to date — automatically

The widget on your site loads from our servers on every page view, so improvements and fixes reach every embedded calculator automatically — you never need to touch the code again. And the embed address itself is a permanent commitment: a widget you install today will keep working years from now.