Put Our Calculators on Your Website, Free

One snippet, one working calculator. No signup, no cost, no catch.

Every calculator on Sizeaholic can be embedded on your own website, free. The embed runs the same code as the page here. Same formulas, same cited sources, same privacy design. Nothing your visitors type is stored or transmitted, ever. When we improve a calculator, your embed updates on its own.

The fastest way

Open any calculator on this site and click the </> Add to your website button below it. A ready-to-paste snippet appears. Copy it into your page's HTML and you are done.

The snippet

Prefer to build it by hand? This is the whole thing. Replace SLUG with a slug from the table below, and NAME with that calculator's name. The name is what the attribution link reads, so use the real one.

<iframe id="sizeaholic-SLUG" src="https://sizeaholic.com/embed/SLUG/" style="width:100%;max-width:520px;height:900px;border:1px solid #e3e8f0;border-radius:12px;" title="NAME" loading="lazy"></iframe>
<p style="font-size:13px;">Calculator powered by <a href="https://sizeaholic.com/SLUG/">NAME</a> on Sizeaholic</p>
<script>window.addEventListener("message",function(e){if(e.origin!=="https://sizeaholic.com"||!e.data||e.data.sizeaholic!=="height")return;var f=document.getElementById("sizeaholic-SLUG");if(f&&e.source===f.contentWindow)f.style.height=e.data.value+"px";});</script>

Copy code

You do not have to guess the height. The last line of the snippet is a small listener: the calculator reports how tall it needs to be and the iframe resizes itself, including when a visitor gets a result and the answer makes the page longer. The 900px in the snippet is only a starting value for the moment before that happens.

If your CMS strips script tags from HTML blocks, the snippet still works. You simply keep the 900px and the frame scrolls internally, which is what most embeds do anyway. Nothing breaks, you just lose the automatic fit.

Every calculator you can embed

All 32 calculators can be embedded. Pick one and use its slug in the snippet above.

The license, in plain words

Embedding is free for any website, commercial or personal. Keep the attribution link under the calculator, use the snippet as provided, and do not present the calculator as your own work. The full wording lives in our Terms of Use. That is the entire deal.

Privacy inside the embed

An embedded calculator behaves exactly like the one on our site. All the math runs in the visitor's browser. Nothing they type is sent anywhere, to us or to you. Our privacy policy applies to the calculator itself; your site's policy covers the page around it.

Questions

Stuck, or want a calculator we have not built yet? Tell us. Embed requests are how several of our tools got built.

Frequently asked questions

Last updated 31 July 2026