Embed free calculators on your website

Every tool on CovertItAll is free to embed — no sign-up, no API key, no cost. Copy one line of code and the calculator works on your page. Useful for teachers, bloggers, forum admins, and anyone who wants a working tool without building one.

How it works

  1. Find the tool you want below (or use the search bar).
  2. Go to that tool's page and copy the embed code from the "Embed this tool" section.
  3. Paste it anywhere in your HTML. The tool loads from CovertItAll — nothing to maintain.

The embed code looks like this:

The small attribution line below the iframe is required and helps other people find the tool.

Popular embeds by topic

3D printing

Filament cost calculator Print time estimator Weight to length Material cost calculator Extrusion width All 3D printing tools →

EV & charging

EV charging time EV trip planner Home charger planner Charging cost calculator All EV tools →

Solar

Panel output calculator Payback calculator Battery bank calculator Panel layout calculator All solar tools →

Electrical

Wire gauge calculator Voltage drop calculator Conduit fill calculator LED resistor calculator All electrical tools →

Unit converters

CM to inches KG to lbs Celsius to Fahrenheit KM to miles Bytes converter All 100+ converters →

Frequently asked questions

Is it really free to embed?

Yes. There is no license fee, no sign-up, and no usage limit. The tools are hosted by CovertItAll and load directly in your visitors' browsers. The only requirement is keeping the small attribution line that comes with the embed code.

Will the embed slow down my page?

No. The iframe uses loading="lazy", so it only loads when the visitor scrolls near it. It has no effect on your page's initial load time or Core Web Vitals score.

Can I use this on a course platform or LMS?

Yes, as long as the platform allows iframe embeds. Most LMS platforms (Teachable, Thinkific, WordPress, Ghost, Notion sites) support iframes. Paste the code into an HTML block.

Can I resize the tool?

Yes. Change the height value in the embed code. Most simple converters fit in 380-420 px. Complex calculators with multiple outputs work better at 500-600 px. Width is set to 100% by default, so it adapts to your layout.

What if the tool changes or breaks?

Updates happen on CovertItAll's end. Your embed code stays the same and picks up improvements automatically. If a tool is ever retired, the embed page redirects to the closest replacement.

Can I request a tool that doesn't exist yet?

Yes. Use the contact link in the menu. Describe what you need and for what audience. Requested tools with clear use cases get built faster.