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BMI Calculator

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Calculate your Body Mass Index (BMI) from height and weight, and see where you fall on the standard weight range.

This tool is for informational purposes only and is not a substitute for professional financial or medical advice. Consult a qualified professional before making decisions. See our Disclaimer.

How it works

  1. Enter your height and weight (metric or imperial)
  2. Your BMI is calculated instantly as you type
  3. See your result plotted on the underweight / normal / overweight / obese range

Frequently asked questions

What is a healthy BMI range?

For most adults, a BMI between 18.5 and 24.9 is classified as a healthy weight range under WHO standard guidelines. Muscle mass, age, and ethnicity can affect how well BMI reflects individual health.

Is BMI accurate for people with high muscle mass?

Not always. BMI doesn't distinguish between muscle and fat, so athletes and very muscular individuals may show a higher BMI despite low body fat.

Does BMI classification differ by ethnicity?

Yes. The World Health Organization recommends lower BMI cutoffs for overweight and obesity classification in Asian populations, since health risks appear at lower BMI values in this group compared to the standard global cutoffs.

Is this calculator suitable for children?

No. This calculator uses adult BMI thresholds. Children and teens require age- and sex-specific percentile charts.

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From the blog

We checked what people actually hate about BMI calculators. Here's what we fixed.
health-calc

We checked what people actually hate about BMI calculators. Here's what we fixed.

App store reviews, Reddit threads, and WHO guidelines pointed to three specific problems with free BMI calculators. Our BMI Calculator addresses all three directly.

2026-08-28

Update history

  • 2026-08-30 Added: a cover image — used as the card thumbnail, social share image, and blog title image.
  • 2026-08-29 Fixed: Embed button now works (it silently did nothing before — Astro module scripts made document.currentScript unreliable) and the generated iframe snippet points at the correct /embed/{category}/{slug} URL instead of a 404. Removed: "API" share button — it linked to /api/v1/{slug}, which doesn't exist on this static site and always 404'd. Will return once a real API is built.
  • 2026-08-28 Added: linked blog post covering the pain points this calculator was built to fix.
  • 2026-08-28 Improved: title-row share bar (copy link, native share, X, Facebook) now shown on every page.
  • 2026-08-28 Fixed: full mobile responsiveness pass (unit toggle, gauge, header nav).
  • 2026-08-27 Launched: BMI calculator with metric/imperial units and WHO Asia-Pacific threshold toggle.