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About the BMI Calculator
Calculate body mass index from height and weight and see which WHO adult category it falls in, plus the weight range that corresponds to a BMI of 18.5 to 24.9 at your height. BMI is a screening number, not a diagnosis.
How to use it
- Choose metric or imperial units.
- Enter your height and weight.
- Read your BMI, the category and the healthy weight range for your height.
Frequently asked questions
What are the BMI categories?
For adults the WHO categories are underweight below 18.5, normal 18.5–24.9, overweight 25–29.9 and obesity 30 and above.
Is BMI accurate for everyone?
No. It does not separate muscle from fat and is less reliable for athletes, older adults, children and some ethnic groups. Talk to a doctor about your health; this is not medical advice.
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Results are estimates for general information. For financial, tax, medical or legal decisions, check with a qualified professional.