Free embeddable widgets
No sign-up. No fees. No API keys. Just copy one line of HTML and paste it anywhere - your visitors get a fully working calculator, maintained by us, forever.
Paste a single iframe tag. No JavaScript libraries to load, no npm install, no build step. It works in WordPress, Webflow, Squarespace, Framer, raw HTML - anywhere.
We maintain every tool. Bug fixes, accuracy improvements, and new features go live automatically in all existing embeds. Your code never needs to change.
No pricing tiers, no "pro" plan, no watermarks. The embed is free because the site is free. That is not changing.
Every embed adapts to any screen size. Your readers on phones and tablets get the same working calculator as desktop visitors.
No developer needed. If you can paste HTML into a page, you can embed a calculator.
Browse calculations.tools and pick any calculator or converter. Every tool page has a built-in embed option - 147+ to choose from across health, finance, math, and unit conversion.
On any tool page, click the "Embed this tool" button in the left sidebar. A panel opens instantly with a ready-to-use HTML snippet.
Copy the snippet and paste it anywhere in your HTML - a blog post, landing page, or sidebar. The calculator appears exactly as it does on this site. No JavaScript setup, no npm packages, no configuration.
This is an actual live embed of the BMI Calculator, running directly on this page. The code below it is exactly what you would paste.
<iframe src="https://calculations.tools/embed/bmi-calculator" width="100%" height="480" frameborder="0" style="border-radius:12px"></iframe>Every tool on calculations.tools has an embed. Here are the most popular ones. Click "Copy code" on any card to get your iframe snippet.
Body mass index from height and weight. Metric and imperial. Includes WHO classification and healthy range.
<iframe src="https://calculations.tools/embed/bmi-calculator" width="100%" height="480" frameborder="0" style="border-radius:12px"></iframe>Three percentage formulas in one: X% of Y, what % is X of Y, and % change between two values.
<iframe src="https://calculations.tools/embed/percentage-calculator" width="100%" height="480" frameborder="0" style="border-radius:12px"></iframe>Final balance, total interest earned, and a year-by-year breakdown. Supports any compounding period.
<iframe src="https://calculations.tools/embed/compound-interest-calculator" width="100%" height="480" frameborder="0" style="border-radius:12px"></iframe>U.S. Navy method and BMI method. Returns body fat percentage, lean mass, and fitness category.
<iframe src="https://calculations.tools/embed/body-fat-calculator" width="100%" height="480" frameborder="0" style="border-radius:12px"></iframe>Live mid-market rates sourced from the European Central Bank. 160+ currencies.
<iframe src="https://calculations.tools/embed/currency-converter" width="100%" height="480" frameborder="0" style="border-radius:12px"></iframe>Instant bidirectional conversion between miles per hour and km/h. No button needed.
<iframe src="https://calculations.tools/embed/mph-to-kmh" width="100%" height="480" frameborder="0" style="border-radius:12px"></iframe>Looking for a specific tool? Browse the full library →
No. There is no account, no registration, and no API key. Copy the code, paste it, done.
Yes, completely free. There are no paid tiers, no watermarks to unlock, and no usage limits. Every tool is free on our site and free to embed elsewhere.
Yes. You can embed on any website, including commercial sites, blogs, and web apps. The only requirement is that the small "Powered by calculations.tools" attribution link at the bottom of the embed remains visible.
Adjust the width and height attributes in the iframe tag. The default height is 480px. For tools with longer output (like a year-by-year compound interest table), try 600px. The embed is scrollable if the content exceeds the iframe height.
No. The embed URL is stable. When we improve or fix a tool, every existing embed automatically receives the update - you do not need to change your code.
Yes. Each tool runs in its own iframe with isolated JavaScript, so there is no conflict between multiple embeds on the same page.
The iframe boundary limits CSS access, so the calculator's internal styles cannot be changed from outside. You can control the iframe's width, height, border-radius, and margin. The embed has a transparent background that blends naturally with most page designs.
Browse 477+ tools - health, finance, math, unit conversion, and more. Each one is free to embed, requires no sign-up, and works out of the box.
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