📖 What is BMI?
Body Mass Index (BMI) is a simple measure that uses your height and weight to estimate if you're at a healthy weight. It's widely used by healthcare professionals as a screening tool.
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 higher
📐 The Formula
Imperial formula: BMI = (Weight (lbs) × 703) ÷ Height (in)²
Example: 70 kg, 1.70 m → BMI = 70 ÷ (1.70)² = 70 ÷ 2.89 = 24.2
❓ Frequently Asked Questions
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat, so athletes may have high BMI despite being healthy. It also doesn't account for age, sex, or body composition.
For adults 20+, the standard BMI categories apply. For children and teens, BMI is age and sex-specific. Some research suggests a slightly higher BMI (23-27) may be optimal for those over 65.
Higher BMI correlates with increased risk of heart disease, diabetes, high blood pressure, and certain cancers. However, it's one factor among many—lifestyle, fitness, and other health markers matter too.
Waist circumference, waist-to-hip ratio, and body fat percentage may be more accurate indicators. Consult a healthcare provider for a comprehensive health assessment.