Free Body Mass Index (BMI) Calculator for Adults
Calculate your Body Mass Index (BMI) instantly using metric or imperial units to evaluate your body weight category based on WHO guidelines.
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BMI Calculator
How to Use BMI Calculator
- 1
Enter your weight in kilograms (or pounds).
- 2
Enter your height in centimeters (or feet/inches).
- 3
Click "Calculate BMI" to see your Body Mass Index.
- 4
View your BMI category: underweight, normal, overweight, or obese.
Frequently Asked Questions
What is BMI?▾
Body Mass Index (BMI) = weight(kg) / height(m)². It is a screening tool that categories weight status relative to height.
What are the BMI categories?▾
Underweight: < 18.5, Normal: 18.5–24.9, Overweight: 25–29.9, Obese: ≥ 30. These are WHO guidelines for adults.
Is BMI accurate for athletes?▾
BMI does not distinguish between muscle and fat. Very muscular people may show high BMI despite healthy body composition.
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