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About BMI Calculator
Our BMI Calculator helps you determine your Body Mass Index based on your height and weight. BMI is a widely used indicator to categorize whether a person is underweight, normal weight, overweight, or obese. The calculator supports both metric and imperial units, and provides detailed results including BMI category, healthy weight range, BMI Prime, and Ponderal Index. Based on World Health Organization (WHO) classification standards.
BMI Calculator
cm
ft
in
1 inch = 2.54 cm
kg
lbs
1 kg = 2.20462 lbs
Disclaimer: This calculator provides estimates for general informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. If you have any health concerns or medical conditions, consult a qualified healthcare professional or your doctor.
About BMI
What is BMI?
Body Mass Index (BMI) is a simple numerical value calculated from your weight and height. It is a widely used screening tool to categorize individuals into weight categories that may lead to health problems. BMI does not directly measure body fat, but research shows it correlates well with direct measures of body fat in most people.
How is BMI Calculated?
BMI is calculated by dividing your weight in kilograms by the square of your height in meters:
BMI = weight (kg) ÷ height² (m²)
Example: A person weighing 70 kg and 1.75 m tall
BMI = 70 ÷ (1.75 × 1.75) = 22.9 kg/m²
BMI Limitations
While BMI is a useful screening tool, it has limitations:
- It does not distinguish between muscle mass and fat mass
- Athletes may have a high BMI due to increased muscle, not excess fat
- It may not be accurate for elderly individuals who have lost muscle mass
- BMI thresholds may differ for children, teens, and certain ethnic groups
- Waist circumference and other measurements provide additional health context
BMI Categories (WHO)
| Classification | BMI Range (kg/m²) |
|---|---|
| Severe Thinness | < 16 |
| Moderate Thinness | 16 - 17 |
| Mild Thinness | 17 - 18.5 |
| Normal | 18.5 - 25 |
| Overweight | 25 - 30 |
| Obese Class I | 30 - 35 |
| Obese Class II | 35 - 40 |
| Obese Class III | > 40 |
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