Free widget · for site owners
Add a free eGFR calculator to your website.
Run a kidney-health, nephrology, medical, or patient-education site? Embed our free CKD-EPI 2021 eGFR calculator with one snippet of code. It's mobile-friendly, needs no signup, stores no visitor data, and stays current automatically — you never have to update it.
<iframe src="https://www.thehealthtools.com/embed/gfr-calculator" width="100%" height="560" style="border:1px solid #e5e5e5;border-radius:14px;max-width:480px" title="eGFR Calculator (CKD-EPI 2021)" loading="lazy"></iframe>
<p style="font:14px/1.5 -apple-system,sans-serif;color:#6b6b67;max-width:480px">Free <a href="https://www.thehealthtools.com/gfr-calculator" target="_blank" rel="noopener">eGFR calculator</a> by TheHealthTools</p>Paste it anywhere in your page's HTML. The small credit line below the calculator is required — please keep the link intact.
How to add it
- Copy the embed code above.
- Paste it into your page's HTML where you want the calculator to appear (most CMS platforms have a "Custom HTML" or "Embed" block).
- Publish. That's it — the calculator loads instantly and updates itself.
Want the frame to resize to its content automatically? The widget posts its height to the parent window via postMessage ({ type: "ht-embed-height", height }), so developers can listen for that message and set the iframe height. A fixed height works fine for everyone else.
Terms of use
- Free to embed on any website, commercial or personal.
- Please keep the attribution link to TheHealthTools intact.
- Don't alter the calculation logic or misrepresent the results.
- Provided for general education only — not medical advice, and not a substitute for professional diagnosis.
The full eGFR calculator page includes CKD staging, guidance, and cited references.
Open the full eGFR calculator →