Put exact calculators on your site in one paste
Free, responsive, and mathematically exact. Configure the look below, copy the snippet, and paste it anywhere — WordPress, Ghost, Squarespace, or plain HTML. No API keys, no fees, no tracking. Every widget auto-resizes to fit its container.
Nutrition converter (density-aware)
Weight ↔ volume ↔ nutrient for 100+ USDA foods. Density-aware: 1 cup of flour and 1 cup of honey weigh different amounts — most converters get this wrong.
Unit converter
Any of 800+ conversions across length, mass, temperature, volume, and more. Server-rendered result for instant load.
How to embed
Two ways — both fully responsive.
1. Copy the snippet (easiest)
Use the “Copy code” button on any widget above. It includes the small embed.js loader that keeps the iframe sized to its content.
2. Placeholder (auto-build)
Drop a placeholder and let the loader build the iframe:
<div data-et-tool="convert/length/meters-to-feet"
data-theme="auto" data-accent="#1d4ed8" data-et-height="220"></div>
<p style="font-size:12px;text-align:center">
<a href="https://www.experttoolkit.net/us/convert/length/meters-to-feet">Meters to Feet Converter</a>
by <a href="https://www.experttoolkit.net">ExpertToolkit</a>
</p>
<script async src="https://www.experttoolkit.net/embed.js?v=4"></script>Keep the small caption link — it is the only thing we ask in return for the free widget, and it sits in your page (not the iframe) so it reads as a normal credit line.
Customization parameters
| Parameter | Values | Description |
|---|---|---|
| theme | auto | light | dark | Color theme. auto follows the visitor's system setting. |
| accent | #hex | Accent color for the result and buttons. |
| radius | 0–24 | Corner radius in pixels. |
| bg | transparent | Transparent card background so the widget blends into your page. |
| hideBrand | true | false | Hide the “Powered by” attribution link. |
| allowUnitChange | true | false | Converter only — let visitors change units. |
License & attribution
- Free for personal and commercial sites.
- Keep the caption credit link that ships with the snippet — that is the deal for using the widget free. You may hide the in-widget badge with
hideBrand=true, but leave the caption. - Widgets run entirely in the visitor's browser — no tracking, no ads inside the frame.