Free Website Widgets
Six honest health calculators, ready to drop into any blog or page. No account, no API key, no cost — just a two-line snippet.
Pick a widget, copy the code, paste it into your article. It renders instantly inside an isolated Shadow DOM, so it can't clash with your site's CSS — and your CSS can't break it. One <script> tag per source, as many widgets as you want.
Category
Runs 5,000 Monte Carlo simulations on the Mifflin-St Jeor equation and returns best case, most likely, and realistic completion weeks — not a single fake date. Powered by HonestSlim.
Waist-to-height ratio — the most evidence-backed single number for metabolic risk. Plots the reader's risk on a colour-coded gauge, validated in 300,000+ people. Powered by InResRisk.
Shows the healthy waist ceiling, elevated-risk threshold, and high-risk threshold for any height. Ideal for articles about waist measurement goals. Powered by InResRisk.
Classic Body Mass Index — a simple weight-and-height ratio with a category badge. Useful as baseline context alongside waist-based measurements. Powered by InResRisk.
BRI models the body as an ellipsoid — a more nuanced alternative to BMI and WHtR, with sex-specific cutoffs validated in population studies. Powered by InResRisk.
Measures abdominal fat distribution from height, weight, and waist circumference. Sex-specific cutoffs derived from cardiovascular risk research. Powered by InResRisk.
Yes, completely free. No account, no API key, no usage limits. Every calculation runs in your reader's browser — their data never leaves their device.
No. Each widget script is under 20 KB, loads asynchronously, and has no external dependencies. It won't affect your Core Web Vitals.
No. Every widget renders inside a Shadow DOM, fully isolated from your page's styles. Your CSS can't break it, and it can't override your CSS.
Yes. Include each source's <script> tag once per page, then add as many <div> elements as you need — each renders independently.
Each widget ships with a light theme (default) and a dark theme via data-theme="dark". Custom brand colours aren't supported yet, but the neutral design fits most sites without adjustment.
No. These are educational screening tools, not diagnostic tools. They don't replace medical advice, blood tests, or clinical evaluation.
Yes. A small "Powered by HonestSlim" or "Powered by InResRisk" link appears below each calculator. That's what keeps these free for everyone — no account, no API key, no cost to you or your readers.