BMI Calculator
Calculate your Body Mass Index and see the WHO category and healthy weight range for your height.
Runs in your browser. Nothing is uploaded.BMI Calculator in 3 steps
Pick your units
Choose metric (cm, kg) or imperial (feet/inches, pounds).
Enter height and weight
Type in your measurements.
See your BMI and category
Get your BMI, its WHO weight category on a colored scale, and the healthy weight range for your height.
Why use this BMI Calculator
Questions about this tool
How is BMI calculated?
BMI = weight (kg) ÷ height (m)² for metric, or weight (lb) × 703 ÷ height (in)² for imperial — both give the same standard BMI value.
Is BMI accurate for everyone?
BMI is a simple screening tool based only on height and weight — it does not distinguish muscle from fat, so it can be less accurate for athletes, older adults, or people with a very muscular or very lean build. It's a starting point, not a diagnosis.
What are the WHO BMI categories?
Under 18.5 is underweight, 18.5–24.9 is a healthy weight, 25–29.9 is overweight, and 30 and above is classified as obese, per WHO standard adult classifications.
What is the "healthy weight range" shown?
It's the range of weights that would put your specific height into the 18.5–24.9 "healthy weight" BMI category — a reference range, not a personal target.