Free Embeddable Health Calculators
Add interactive metabolic risk calculators to your website or blog. No account. No API key. No cost. Two-line snippet, works on most website platforms.
Copy the two lines of code for any calculator below and paste them into your article or page. The widget will render automatically. Supports data-theme="dark" and data-units="imperial" attributes. One <script> tag per page is enough — add as many <div> elements as you like.
The most evidence-backed single number for metabolic risk. Calculates WHtR and plots it on a colour-coded gauge with a healthy waist ceiling reference.
BRI models the body as an ellipsoid. A more nuanced alternative to BMI and WHtR, with sex-specific cutoffs validated in population studies.
Shows the healthy waist ceiling, elevated risk threshold, and high-risk threshold for any height. Ideal for articles focused on waist measurement goals. Includes a built-in cm/in unit toggle.
Conicity Index measures abdominal fat distribution using height, weight, and waist circumference. Sex-specific cutoffs derived from cardiovascular risk research.
Classic Body Mass Index. Simple weight-and-height ratio with category badge. Useful as baseline context alongside waist-based measurements.
Works on most website platforms
Frequently asked questions
Yes, completely free. No account, no API key, no usage limits. The calculators are self-contained — your readers' data never leaves their browser.
No. The script is under 5 KB gzipped, loads asynchronously, and has no external dependencies. It won't affect your Core Web Vitals score.
No. Each widget runs inside a Shadow DOM, which fully isolates it from your page's styles. Your CSS can't break the widget, and the widget can't override your CSS.
Yes. Paste the two lines into the HTML block of any post or page. Works with the classic editor and the block editor (Gutenberg). No plugin needed.
Yes. Include the <script> tag once per page, then add as many <div data-irr="..."> elements as you need. Each renders independently.
The widget ships with a light theme (default) and a dark theme via data-theme="dark". Custom brand colours are not currently supported, but the neutral design fits most sites without adjustment.
No. The calculator runs entirely in the browser. No login, no cookies, no data sent to any server.
No. These are educational screening tools, not diagnostic tools. They do not replace medical advice, blood tests, or clinical evaluation. Readers with health concerns should consult a qualified healthcare professional.
Yes. A small "Powered by InResRisk" link appears below each calculator. This helps us keep the widgets free for everyone — no account, no API key, no cost to you or your readers.