BMI Calculator — Check Your Body Mass Index
Calculate your Body Mass Index with metric or imperial units.
How to Use BMI Calculator
Choose metric or imperial units
Enter your weight and height
See your BMI score and health category instantly
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About BMI
Body Mass Index (BMI) is a simple screening measure that uses your weight and height to estimate body fatness. While it doesn't directly measure body fat, it's a useful first-step indicator for weight categories that may lead to health problems.
BMI Limitations
- Doesn't distinguish between muscle and fat mass
- May overestimate body fat in athletes
- May underestimate body fat in older adults
- Not suitable for children under 2 years
Frequently Asked Questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered normal. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is classified as obese.
Is BMI accurate for athletes?
BMI does not distinguish between muscle and fat mass. Athletes with high muscle mass may have a high BMI despite being healthy.