BMI Calculator
Calculate your Body Mass Index in seconds — metric or imperial.
What Is BMI?
Body Mass Index (BMI) is a simple calculation using your height and weight to estimate whether you fall into a healthy weight range. It's widely used by doctors as a quick screening tool, though it doesn't directly measure body fat and doesn't account for muscle mass, bone density, or body composition.
BMI Categories for Adults
According to standard adult BMI ranges: below 18.5 is considered underweight, 18.5-24.9 is considered a healthy weight, 25-29.9 is considered overweight, and 30 or above is considered obese. These ranges apply to most adults but are not always accurate for athletes, pregnant women, older adults, or children.
Limitations of BMI
BMI doesn't distinguish between fat and muscle. A muscular athlete may have a high BMI without carrying excess fat, while someone with a "normal" BMI could still have a high body fat percentage. Use your BMI result as one data point among several — not a complete picture of your health.
Frequently Asked Questions
Is BMI accurate for everyone?
No. BMI is a general screening tool and can be misleading for athletes, bodybuilders, elderly people, and pregnant women, since it doesn't measure body fat directly.
What is a healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered within the healthy weight range, according to standard classifications used by health organizations.
Does BMI apply to children?
No, children and teens require age- and gender-specific BMI percentile charts, not the adult BMI formula used in this calculator.