BMI Calculator

Calculate your Body Mass Index (BMI) based on your height and weight. Supports both US standard units (feet, inches, pounds) and international metric units (centimeters, kilograms).

ft
in
lbs
Body Mass Index
23 kg/m²
Normal
Under
Normal
Over
Obese
23
Healthy Weight for Height:
129 – 174 lbs

You have a healthy body weight. Maintain balanced nutrition and daily movement.

Standard World Health Organization (WHO) BMI Categories

CategoryBMI Range (kg/m²)Health Risk Profile
Underweight< 18.5Nutritional deficiency, lower immune resistance
Normal Weight18.5 – 24.9Lowest statistical risk for cardiovascular issues
Overweight25.0 – 29.9Moderate risk for high blood pressure & insulin resistance
Obesity (Class I & II)≥ 30.0High risk for diabetes, coronary heart disease

What is Body Mass Index (BMI)?

Body Mass Index (BMI) is an anthropometric screening metric established by the World Health Organization (WHO) to classify body weight relative to stature in adult men and women.

Formulas for Calculating BMI

Metric Formula:

BMI = weight (kg) / [height (m)]²

US Standard Formula:

BMI = 703 × weight (lbs) / [height (inches)]²
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