BMI calculator
Body mass index from height and weight, with the Chinese and WHO ranges and the healthy weight for your height.
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Runs in this page in your browser; nothing is uploaded.
About this tool
Work out body mass index (BMI) from height and weight, and see which range it falls in under both the Chinese adult standard and the WHO classification. The page also shows the weight range that counts as normal for your height, for example 53.5–69.1 kg (Chinese standard) or 53.5–72.0 kg (WHO) at 170 cm.
Height is entered in centimetres (50–260) and weight in kilograms (2–500), and the result updates as you type. BMI is a screening figure for adults, not a diagnosis, and does not suit children, pregnancy or very muscular builds. The calculation runs in your browser and nothing is uploaded.
How to use it
- Enter your “Height (cm)”.
- Enter your “Weight (kg)”; decimals such as 65.5 are fine.
- Read the BMI, shown to one decimal place, and its category under the “Chinese standard” and the “WHO” classification.
- Check the “Normal weight for your height” and the two tables below, where your range is highlighted.
Common questions
Which BMI ranges does the page use?
Chinese standard (WS/T 428-2013): underweight below 18.5, normal 18.5–23.9, overweight 24–27.9 and obese from 28. WHO: underweight below 18.5, normal 18.5–24.9, overweight 25–29.9, and obese class I, II and III from 30, 35 and 40.
Why do the Chinese standard and the WHO give different results?
The Chinese cut-offs are lower: overweight starts at 24 instead of 25, and obese at 28 instead of 30. At 170 cm and 72 kg, for example, the BMI is 24.9, which is overweight by the Chinese standard but normal by the WHO classification.
How is BMI calculated?
BMI is weight in kilograms divided by the square of height in metres. 65 kg at 170 cm gives 65 ÷ 1.7², which is about 22.5.
Can I enter feet, inches or pounds?
No, the page takes centimetres and kilograms only. Convert your figures first with Unit converter, then enter them here.
Who should not rely on BMI?
As the page notes, BMI does not suit children, pregnancy or very muscular builds, and it is a screening figure rather than a diagnosis. For questions about your own health, ask a doctor.
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