Calculate your Body Mass Index
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 provides a reliable indicator of body fatness for most people and is used to screen for weight categories that may lead to health problems.
Weight (kg) ÷ [Height (m)]²
Example: 70kg ÷ (1.75m × 1.75m) = 22.9
[Weight (lbs) ÷ Height (inches)²] × 703
Example: (154lbs ÷ 70in²) × 703 = 22.1
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Risk of nutritional deficiencies and osteoporosis |
| 18.5 - 24.9 | Normal weight | Lowest risk of health problems |
| 25.0 - 29.9 | Overweight | Moderate risk of developing health problems |
| 30.0 and above | Obese | High risk of developing health problems |
Important: BMI is a screening tool, not a diagnostic measure. Consult a healthcare provider for a comprehensive health assessment.
BMI may not be accurate for athletes or individuals with high muscle mass, as muscle weighs more than fat. These individuals might have a high BMI but low body fat percentage.
No, children and teens need age and sex-specific BMI percentiles because their body composition varies as they grow.
For most adults, checking BMI every few months is sufficient unless you're actively trying to change your weight. Focus more on overall health indicators rather than BMI alone.
This BMI calculator is for informational purposes only. It is not intended as medical advice. Always consult with a qualified healthcare provider for diagnosis and treatment of health conditions. Do not disregard professional medical advice because of something you have read on this website.