Put a calculator on your site

Eight of our most-used calculators, free to embed with one iframe tag. They match your visitors' light/dark preference, work on mobile, and — same promise as everything we build — set no cookies and run no trackers on your visitors.

The deal, in one line: free forever, for any site — blogs, realtor pages, advisor sites, classrooms. The small "Powered by MiniCalc" link stays visible; that's the whole price. Widgets are served from our CDN and won't slow your page (they lazy-load).

How it works

Each widget is a self-contained page on our domain, loaded in a sandboxed iframe. Your page stays yours — we can't see your visitors, and your visitors' inputs never leave their browser. Copy the snippet, paste it into your HTML (or a WordPress "Custom HTML" block, Squarespace code block, Notion embed…), done.

Sizing

The snippets ship with a sensible height for each widget. width="100%" makes it fill whatever column you place it in — widgets are responsive down to ~320px.

FAQ

Is this really free? What's the catch?

Free, no signup, no API key. The attribution link is the catch, and it's the whole catch. If the widgets ever change in a way that affects embedders, the URLs will keep working — we treat them as a public API.

Will it slow my page down?

The snippets use loading="lazy", so the widget only loads when it scrolls into view. The pages themselves are static HTML — no framework, a few KB of JavaScript.

Can I customize the colors?

Not yet. The widgets follow your visitor's system light/dark preference automatically. If you'd want brand-color matching, email us — enough interest moves it up the list.