BMI Calculator
Calculate your Body Mass Index and get comprehensive health insights with our professional-grade calculator
BMI Calculator
Calculate your BMI in 10 seconds! ⚡
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Let's start with your age 🎂
Understanding BMI
Body Mass Index (BMI) is a simple calculation using a person's height and weight. The BMI is a convenient rule of thumb used to broadly categorize a person as underweight, normal weight, overweight, or obese.
BMI Categories
Underweight< 18.5
Normal18.5 - 24.9
Overweight25 - 29.9
Obese≥ 30
Children & Teens
For ages 2-20, BMI is interpreted using percentiles:
Underweight< 5%
Healthy5% - 85%
At Risk85% - 95%
Overweight> 95%
Health Risks
High BMI Risks:
- • Heart disease
- • Type 2 diabetes
- • High blood pressure
- • Sleep apnea
- • Certain cancers
Low BMI Risks:
- • Malnutrition
- • Osteoporosis
- • Decreased immunity
- • Fertility issues
BMI Calculation Formula
🇺🇸 US Units
BMI = 703 × weight (lbs)
÷ height² (inches)
Example: 703 × 160 ÷ (70)² = 22.9
🌍 Metric Units
BMI = weight (kg)
÷ height² (meters)
Example: 70 ÷ (1.75)² = 22.9
Frequently Asked Questions
Everything you need to know about BMI