BMI Calculator
Calculate your Body Mass Index (BMI) in metric or imperial units and see what category it falls into.
BMI—
Enter height and weight
About BMI
Body Mass Index is weight (kg) divided by height (m) squared. It was designed as a quick population-level screening tool, not a diagnostic. Because it ignores muscle mass, body composition, age, sex, and ethnicity, BMI can over-classify muscular people as "overweight" and under-classify older adults who have lost muscle but kept fat.
For most adults, BMI is a useful rough check rather than a verdict — a healthcare professional can interpret it alongside waist circumference, blood pressure, and lab work.
WHO BMI categories (adults)
- Under 18.5 — Underweight
- 18.5 to 24.9 — Normal weight
- 25 to 29.9 — Overweight
- 30 and above — Obesity
This calculator is for general information only and is not medical advice.