1. 01Enter the height in centimetres; the accepted range is 50–280 cm.
2. 02Enter the weight in kilograms; the accepted range is 10–500 kg.
3. 03Read the BMI to one decimal place with its Chinese-standard band and its position on the scale.
4. 04Read the healthy weight range and compare the WHO bands in the table below.

• Height is entered in centimetres and weight in kilograms only; values outside 50–280 cm or 10–500 kg produce no result.
• The Chinese bands are <18.5, 18.5–23.9, 24–27.9 and ≥28; the WHO bands are <18.5, 18.5–24.9, 25–29.9 and ≥30.
• The healthy weight range is derived from a BMI of 18.5 to 23.9 under the Chinese standard, to one decimal place.
• BMI does not distinguish fat from muscle, and the page states clearly that pregnant people, athletes, older adults and minors should not apply it directly.
• What it does not do: it does not estimate body-fat percentage or basal metabolic rate, nor provide a medical diagnosis.

Height and weight are computed in the browser only; nothing is saved or uploaded.