Health
BMI Calculator: Body Mass Index
Learn how BMI is calculated and its limitations.
BMI uses height and weight to categorize body size.
Formula
BMI = kg/m². Imperial: (lbs/in²)×703.
Categories
- Underweight: <18.5
- Normal: 18.5-24.9
- Overweight: 25-29.9
- Obese: 30+
Limitations
Does not distinguish muscle from fat. Athletes may have high BMI despite being healthy.
Frequently Asked Questions
BMI accurate?
Useful screening but not diagnostic. Does not account for muscle mass.
Healthy range?
18.5-24.9. Varies by age and sex.
Lower BMI?
Caloric deficit + exercise. 1-2 lbs/week.