BMI Calculator

Calculate your Body Mass Index in metric (kg/cm) or imperial (lb/ft/in) units.

Weight (kg) Height (cm)

What is BMI?

Body Mass Index (BMI) is a measure of body fat based on height and weight. It applies to adult men and women and is calculated as weight (kg) divided by height squared (m²).

BMI formula

Metric: BMI = weight (kg) / height (m)²
Imperial: BMI = (weight (lb) / height (in)²) × 703

BMI categories (WHO standard)

Below 18.5 — Underweight
18.5 to 24.9 — Normal weight
25.0 to 29.9 — Overweight
30.0 and above — Obese

Limitations of BMI

BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, or fat distribution. Athletes often have a high BMI despite low body fat. Always consult a healthcare professional for a complete health assessment.