BMI Calculator
Body Mass Index (BMI) is a simple measure using your height and weight to estimate whether you're in a healthy weight range. Enter your details below to get your BMI instantly.
Your BMI
This calculator provides estimates and is for informational purposes only.
How BMI Is Calculated
BMI is calculated by dividing your weight in kilograms by your height in meters squared: BMI = weight (kg) ÷ height² (m²). While BMI doesn't measure body fat directly, it provides a useful screening tool that correlates with more direct measures of body fat.
The World Health Organization (WHO) defines BMI categories as: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above). These ranges apply to adults aged 20 and older.
Frequently Asked Questions
What is a healthy BMI range?
A healthy BMI for adults typically falls between 18.5 and 24.9. This range is associated with the lowest risk of weight-related health problems.
Is BMI accurate for athletes?
BMI may overestimate body fat in athletes and muscular individuals because it doesn't distinguish between muscle and fat mass. For such cases, body fat percentage measurements are more useful.
Does BMI apply to children?
For children and teens, BMI is interpreted differently using age- and sex-specific percentiles. This calculator is designed for adults aged 20 and older.