⚖️ BMI Calculator
Calculate your Body Mass Index (BMI) using your height and weight. Supports both metric (kg/cm) and imperial (lbs/ft) units.
| BMI Range | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| ≥ 30.0 | Obesity |
📖 What is BMI?
Body Mass Index (BMI) is a simple measurement using height and weight to estimate body fat. It was devised by Belgian mathematician Adolphe Quetelet in the 1830s and is widely used by healthcare professionals as a screening tool for weight categories that may lead to health problems.
BMI is calculated by dividing a person's weight in kilograms by the square of their height in meters: BMI = kg/m². While BMI doesn't directly measure body fat percentage, it correlates with more direct measures and provides a useful starting point for health assessments.
Important: BMI is a screening tool, not a diagnostic tool. It doesn't account for muscle mass, bone density, age, gender, or ethnicity. Athletes, for example, may have a high BMI due to muscle mass rather than excess body fat. Always consult a healthcare professional for proper health assessment.
❓ Frequently Asked Questions
BMI is a useful population-level screening tool but has limitations for individuals. It doesn't distinguish between muscle and fat, doesn't account for fat distribution, and may not be accurate for athletes, elderly people, or certain ethnic groups. Consider it a starting point, not a definitive health measure.
A BMI between 18.5 and 24.9 is generally considered "normal weight" by the World Health Organization. However, optimal BMI can vary by age, sex, and ethnicity. A healthcare provider can give personalized guidance.
BMI = weight (kg) ÷ height (m)². In imperial units: BMI = (weight in lbs × 703) ÷ (height in inches)². For example, a person weighing 70 kg and 175 cm tall: BMI = 70 ÷ (1.75)² = 22.9.