BMI Calculator

Calculate your Body Mass Index and health status

About Body Mass Index (BMI)

Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in meters squared.

BMI Categories:

  • Underweight: BMI less than 18.5
  • Normal weight: BMI 18.5 to 24.9
  • Overweight: BMI 25 to 29.9
  • Obese: BMI 30 or greater

BMI Formula:

BMI = Weight (kg) ÷ Height (m)²

Important Considerations:

  • BMI doesn't distinguish between muscle and fat mass
  • Athletes may have high BMI due to muscle mass
  • Elderly people may have low BMI due to muscle loss
  • BMI ranges may vary by ethnicity
  • Not suitable for children and adolescents

When to Use BMI:

  • General health screening and population studies
  • Initial assessment of weight status
  • Tracking weight changes over time
  • Discussing weight with healthcare providers
  • Setting general health and fitness goals