BMI Calculator

How to use

1. Open this page on any device — no signup needed.
2. Fill in the fields above.
3. Get your result instantly — nothing is uploaded.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance); content last reviewed September 2026. For decisions that matter, confirm with a licensed professional in your country.

About this tool

Body Mass Index (BMI) estimates body fat using weight and height: weight (kg) ÷ height² (m²), or 703 × lb ÷ in². The WHO categories are: under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, 30+ obese. BMI is a screening tool, not a diagnosis — athletes and older adults may need other measures.

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