BMI Calculator
Calculate body mass index (BMI) from your height and weight.
Result
General international adult BMI reference
BMI classification may vary by country or medical organization. BMI is a reference indicator and does not replace medical diagnosis.
How It Is Calculated
BMI = weight (kg) ÷ height (m) squaredFor example, 170cm and 65kg gives a BMI of about 22.5.
Reading a BMI result
BMI compares weight with height squared and is mainly used as a population-level screening measure for adults. A result near a category boundary should be read as a continuous value, not as a sudden change in health at one decimal point.
What BMI does not measure
BMI does not distinguish muscle from body fat or account for fat distribution, pregnancy, age-related changes, or individual medical history. Children and adolescents require age- and sex-specific growth references rather than the adult categories shown here.
Frequently Asked Questions
How is BMI calculated?
Divide weight in kilograms by height in metres squared: BMI = kg ÷ m².
Can BMI alone determine my health?
No. BMI does not account for every factor such as body composition, age, sex, or individual circumstances. Consult a qualified professional for health decisions.
Do children use the same BMI ranges?
No. Children and adolescents require age- and sex-specific growth references, so these adult ranges should not be applied directly.