BMI Calculator
Calculate your Body Mass Index (BMI) using the scientifically proven WHO formula to assess your weight status.
Enter Your Measurements
Enter your weight and height to calculate your BMI using the WHO standard formula.
BMI Classifications (WHO Standard)
ClassificationBMI Range (kg/m²)
Severe Thinness< 16
Moderate Thinness16 – 17
Mild Thinness17 – 18.5
Normal18.5 – 25
Overweight25 – 30
Obese Class I30 – 35
Obese Class II35 – 40
Obese Class III> 40
BMI Formula
Metric Units (SI)
BMI = weight (kg) / [height (m)]²
Weight is measured in kilograms (kg) and height is measured in meters (m)
US Customary Units
BMI = (weight (lbs) × 703) / [height (inches)]²
Weight is measured in pounds (lbs) and height is measured in inches (in)
Important Note: BMI is a screening tool and should not be used as a diagnostic tool. It does not account for factors like muscle mass, bone density, or body composition. For very muscular individuals, BMI may overestimate body fat, while for older adults it may underestimate it. Always consult with a healthcare professional for health-related decisions.
Understanding BMI
What BMI Measures:
- • BMI is a measure of body weight relative to height
- • It provides a reliable indicator of body fatness for most people
- • Used as a screening tool to identify potential weight-related health problems
- • The same formula applies to both adult men and women
Limitations:
- • Does not distinguish between muscle and fat mass
- • May not be accurate for athletes with high muscle mass
- • May not reflect body fat distribution
- • Age and gender differences are not considered in the basic calculation
- • Should be used alongside other health assessments