BMI Calculator

Curious about your Body Mass Index? Enter your height and weight below to get your BMI in seconds.

Frequently Asked Questions (FAQ)

1. What is Body Mass Index (BMI)? Body Mass Index (BMI) is a standardized screening metric that estimates body fatness based on your height and weight. It provides a general indication of whether a person is underweight, at a healthy weight, overweight, or obese.

2. How is BMI calculated?

• Metric Formula: Weight (kg) / [Height (m)]²
• Imperial Formula: 703 × Weight (lbs) / [Height (in)]²

3. What are the standard BMI categories for adults?

• Underweight: BMI less than 18.5
• Normal weight: BMI between 18.5 and 24.9
• Overweight: BMI between 25.0 and 29.9
• Obesity: BMI of 30.0 or higher

4. Is BMI accurate for athletes and bodybuilders? No, BMI can be misleading for very muscular individuals. Because muscle tissue weighs more than fat per unit of volume, high-level athletes or bodybuilders may register as "overweight" or "obese" despite having very low body fat percentages.

5. Does BMI apply to children and teens the same way as adults? No. While the basic calculation is similar, children and adolescents (ages 2 to 19) are evaluated using BMI-for-age percentiles, which compare measurements against growth charts for children of the same age and biological sex.

6. What are the limitations of relying solely on BMI? BMI does not directly measure body fat, nor does it distinguish between muscle mass, bone density, water weight, and fat tissue distribution. Additionally, it does not account for differences in age, sex, ethnicity, or frame size.

7. How can I lower or improve my BMI score? A healthy BMI score is generally achieved through a balanced diet rich in whole foods, consistent physical activity (a mix of aerobic and resistance exercises), regular sleep, and a gradual caloric deficit if weight loss is required. Always consult a healthcare professional before starting a new weight-management program.