Free calculators for your website.
Drop a fast, mobile-friendly calculator into any page with a single embed. 220+ tools across finance, health, education, construction, and more. Hosted, maintained, and updated by us. Free forever.
A working calculator on your page in five minutes.
Mobile-first design
Fully responsive. Touch-optimized inputs. Looks native on every device.
Match your brand
Pick colors, fonts, light or dark theme. Live preview as you customize.
Zero maintenance
We host it. We update it. Your embed code never needs to change.
Page-speed safe
Lazy-loaded iframe. No impact on Core Web Vitals or Lighthouse scores.
Three steps. That's it.
Pick your calculator
Browse 220+ calculators. Find one that matches what your audience is looking for.
Customize the look
Use our builder to match your site's colors, fonts, and theme. Preview updates live.
Paste & publish
Copy the iframe snippet. Drop it into any HTML block, page builder, or CMS.
Works on every major platform
See them in action.
These are live widgets. Click any to customize and grab the embed code.
Finance & loans
Health & fitness
Business
Don't see what you need?
Browse all 220+ calculators →What we ask for.
Everything we do is free, hosted on our infrastructure, updated automatically. In exchange we include a small credit link under the widget:
That's the entire arrangement. You're welcome to mark the link
rel="nofollow"
if you prefer. We just ask that it stays visible. No scripts injected, no tracking
pixel for your visitors, no upsells, no catch.
Questions we hear a lot.
Is it really free? +
Yes. The widgets are free to use on any site, forever. The only requirement is the visible credit link.
Will it slow down my page? +
No. The calculator loads in a lazy iframe that renders in parallel with your page. It does not block your Core Web Vitals or Lighthouse performance score.
Can I match my site's brand exactly? +
Our builder lets you set the accent color (any hex), font family, light/dark theme, and border on or off. For higher-traffic sites we'll build a fully brand-matched version : get in touch.
Who maintains the calculator? +
We do. Formula corrections, browser compatibility fixes, new features, all pushed automatically. Your embed code never needs to change once you've pasted it.
What if the calculator breaks? +
Email us at hi@metricscalculator.com. We've never had an embed go offline long-term, and every widget is covered by our uptime monitoring.
Can I track traffic from my embed? +
Yes. Add ?source=your-site in the builder and we'll tag click-throughs on our side and can share traffic stats with you any time.
Do you have a calculator for <X>? +
Probably. We cover 220+ right now and add more every week. If we don't have it, tell us. Calculator requests from embedding partners go to the top of the queue.
Pick one. Paste it. Done.
No signup. No account. No waiting on a rep.