Enter your height and weight to see your Body Mass Index, which category it falls in, and the healthy weight range for your height — instantly and privately.
Body Mass Index (BMI) is a quick way to see whether your weight is in a healthy range for your height. It's the number doctors, gyms, and insurers reach for first because it takes just two measurements. This calculator works in metric or imperial units, shows your result on a color-coded scale, and tells you the weight range that would put you in the "normal" band for your height.
Your numbers are calculated right in your browser and never sent anywhere — health information is personal, and this keeps it that way.
BMI divides your weight by the square of your height. In metric that's kg ÷ (m × m); in imperial it's 703 × lb ÷ (in × in). The result maps to standard adult categories set by the World Health Organization:
| Category | BMI range |
|---|---|
| Underweight | Below 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obese | 30.0 and above |
BMI is a useful screening number, not a complete picture of health. Because it only uses height and weight, it can over- or under-estimate body fat for very muscular people, older adults, and others. It's designed for adults aged 20 and over; children and teens use age- and sex-specific percentiles instead. Always discuss your individual situation with a qualified healthcare professional rather than relying on BMI alone.
No account, no upload, no stored data — enter your numbers, read your result, and that's it.