BMI Calculator
Enter height and weight to calculate your BMI and see which range you fall into. For reference only, not a medical diagnosis.
BMI is just one reference point — it doesn't account for body fat percentage or muscle mass. Not a substitute for medical advice.
What Is BMI?
BMI (Body Mass Index) is the most common screening tool for assessing whether someone's weight falls within a healthy range, based on the ratio of weight to height. No blood test or special equipment is needed — just your height and weight — which is why it's widely used in checkups, insurance assessments, and everyday health tracking.
How Is BMI Calculated?
The formula is simple: weight in kilograms divided by height in meters, squared.
For example, someone who is 170 cm (1.7 m) tall and weighs 65 kg has a BMI of 65 ÷ (1.7 × 1.7) ≈ 22.5, which falls in the normal range.
Related Tools
Common mistakes and interpretation
BMI does not distinguish muscle from fat, and it has important limitations for children, pregnancy, older adults and people with certain medical conditions. Thresholds can also differ by population and country, so confirm which standard a report is using. If abnormal measurements persist or you have concerning symptoms, seek professional medical advice.
Practical use
For cleaner comparisons, measure under similar conditions and record the date. This calculator processes the values needed for the calculation in the browser; the result should not be treated as a medical diagnosis.
Content check: 2026-09-12. This guide explains the calculator rather than promising a particular outcome; for formal decisions, use current official or provider documentation.
FAQ
How is BMI calculated?
BMI = weight (kg) ÷ height (m)². Enter height and weight to get your index and category instantly.
Is BMI a medical diagnosis?
No. BMI is a rough screening metric and does not account for muscle mass, waist size, or medical history. Consult a professional for health decisions.
Is my data uploaded?
No. Calculation stays in your browser.
Can children or pregnant people use this?
This page is aimed at adults. Children, teens, and pregnancy need different assessment methods.
What does the category mean?
Categories are general adult ranges for reference only. Official guidance may vary by country—use local health authority standards when available.