BMI Calculator
Calculate your Body Mass Index (BMI) to check if your weight is in a healthy range.
Enter values to see results
Fill in the form and click Calculate
Understanding BMI
Body Mass Index (BMI) is a simple measure of body fat based on your height and weight. While it does not directly measure body fat, it correlates with other direct measures of body fat.
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
BMI Formula
Metric: BMI = weight (kg) / height (m)²
Imperial: BMI = (weight (lbs) × 703) / height (in)²
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a measure of body fat based on height and weight. It is calculated by dividing your weight in kilograms by your height in meters squared. BMI is used as a screening tool to identify possible weight problems in adults.
What are the BMI categories?
BMI categories are: Underweight (BMI < 18.5), Normal weight (BMI 18.5-24.9), Overweight (BMI 25-29.9), and Obese (BMI 30 or higher). Obesity is further divided into Class 1 (30-34.9), Class 2 (35-39.9), and Class 3 (40+).
Is BMI accurate for everyone?
BMI has limitations. It does not distinguish between muscle and fat, so athletes may have a high BMI despite having low body fat. It also does not account for age, gender, ethnicity, or body composition. BMI should be used as a general guideline, not a definitive health measure.
How do I calculate BMI?
For metric: BMI = weight (kg) / height (m)². For imperial: BMI = (weight in pounds × 703) / (height in inches)². For example, a person weighing 70 kg and 1.75 m tall has a BMI of 70 / (1.75 × 1.75) = 22.9.