BMI Calculator
Calculate your Body Mass Index based on height and weight.
Understanding Body Mass Index (BMI)
Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight, and obesity in adults. It is defined as a person's weight in kilograms divided by the square of their height in meters (kg/m²).
Who is this for?
This calculator is designed for adults (18+). For children and teens, BMI needs to be interpreted relative to age and gender (growth charts). This tool provides a general screening and is not a diagnostic tool.
BMI Categories
- Underweight (<18.5): You may be malnourished or have an underlying health condition.
- Normal (18.5 - 24.9): This range is associated with the lowest health risks for most people.
- Overweight (25 - 29.9): Excess weight may increase the risk of heart disease and diabetes.
- Obese (>30): significantly higher risk of lifestyle-related diseases.
Limitations of BMI
While useful, BMI does not measure body fat directly. It may overestimate body fat in athletes who have a muscular build and underestimate body fat in older persons who have lost muscle.
Health Risks Associated with High BMI
Being overweight or obese increases the risk of hypertension, dyslipidemia (high cholesterol), Type 2 diabetes, coronary heart disease, stroke, and sleep apnea.