BMI Calculator
Calculate your Body Mass Index (BMI) using metric (kg, cm) or imperial (lbs, ft/in) units.
cm
kg
Your Calculated BMI
22.9
Normal Weight
Based on the official World Health Organization (WHO) criteria for adult health classification.
Underweight (<18.5)
Normal (18.5–24.9)
Overweight (25–29.9)
Obese (≥30)
This calculator provides general statistical estimates. Consult a licensed healthcare provider for clinical assessments.
How to Use BMI Calculator
- Select your preferred unit system (metric or imperial).
- Enter your height and weight.
- Your BMI and WHO category are calculated instantly.
- Read the explanation to understand what your BMI means.
About this Tool
Body Mass Index (BMI) is a widely used screening tool developed by the World Health Organization to categorize adults into weight status groups. It is calculated by dividing your weight in kilograms by the square of your height in metres. While useful as a quick health indicator, BMI does not measure body fat directly and should be interpreted alongside other health assessments.
Frequently Asked Questions
Common questions about BMI Calculator, accuracy, and browser-side security.
According to WHO, a BMI between 18.5 and 24.9 is considered normal weight for adults.
BMI is a general screening tool, not a diagnostic measure. Athletes may have high BMI due to muscle mass. Always consult a healthcare professional.
BMI = weight (kg) / height (m)². In imperial: BMI = 703 × weight (lbs) / height (in)².
The WHO BMI scale uses the same categories for adult men and women. However, body fat distribution differs, so context matters.