BMI Calculator
Calculate your Body Mass Index (BMI) and see the healthy weight range for your height.
BMI is a rough screening measure and does not account for muscle, age or body shape. It is general information, not medical advice. Speak to a doctor for a personal assessment.
How to use it
- Choose metric or imperial units.
- Enter your height and weight.
- Read your BMI, category and healthy weight range.
How it works and why it matters
Body Mass Index (BMI) divides weight by the square of height. It is a quick screening tool used in clinics and research to group adults into categories such as underweight, healthy weight, overweight and obesity. It does not measure body fat directly, so athletes and older adults may get a misleading result. Use it as a starting point for a conversation with a health professional.
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Questions
What is a healthy BMI?
For most adults, a BMI from 18.5 to 24.9 is in the healthy range, according to the WHO standard categories.
Is BMI accurate for everyone?
No. It can overestimate body fat in muscular people and underestimate it in some older adults. It is a screening tool, not a diagnosis.
How is BMI calculated?
BMI = weight in kilograms divided by height in metres squared. Imperial units use 703 times pounds divided by inches squared, which this tool handles for you.