Calculate adult BMI, compare WHO and Chinese criteria, and explore your reference weight range. No account needed.
Adult screening only (18+). Not for children or pregnancy; BMI does not measure body fat or diagnose health.
BMI = kg / m²
Classification uses the unrounded BMI. Displayed numbers are rounded.
Nothing is saved automatically. Save keeps up to 90 measurements on this browser only. Website analytics do not receive your measurements.
Move the slider to preview BMI at the same height: the dashed marker is the preview, the solid marker is your measurement. This is not a weight-loss recommendation and does not change or save your measurement.
The BMI formula is identical; the classification thresholds differ. Both standards apply the same adult cut-offs to men and women.
Your result under each standard
| Category | Chinese adult standard | WHO adult standard |
|---|---|---|
| Underweight | < 18.5 | < 18.5 |
| Normal range | 18.5 ≤ BMI < 24 | 18.5 ≤ BMI < 25 |
| Overweight | 24 ≤ BMI < 28 | 25 ≤ BMI < 30 |
| Obesity | ≥ 28 | ≥ 30 |
Records stay on this browser and are not synced. Shared-device users can see them. Clearing site data removes them; exports contain your measurements.
No saved measurements yet.
Points use elapsed time. Changes in height or measurements affect BMI; this chart does not judge progress or health.
| Saved time | Height (cm) | Weight (kg) | BMI | Classification standard | Delete |
|---|
BMI = weight (kg) ÷ height (m)². At 175 cm and 70 kg: 70 ÷ 1.75² = 22.86, in the normal range under both standards.
Read the BMI formula and standards guideThe Chinese adult normal interval is 18.5 ≤ BMI < 24. WHO uses 18.5 ≤ BMI < 25. Chinese overweight starts at 24 and obesity at 28; WHO uses 25 and 30. A normal BMI does not guarantee good health.
No. Adult BMI is weight in kilograms divided by height in metres squared. Sex and age do not enter this formula. Children and adolescents need age- and sex-specific interpretation, which this adult calculator does not provide.
Yes. One mainland Chinese jin is 0.5 kg; one pound is exactly 0.45359237 kg. Choose the unit next to the weight input. Unit changes convert your measurements without changing their meaning.
No. BMI is a weight-for-height screening index. It cannot distinguish muscle from fat, assess fat distribution, or diagnose a condition. The reference weight interval is a formula-derived range, not an individual treatment goal.
Calculations run in your browser. Measurements are not sent to ToolKnit or added to page URLs or analytics events. Nothing is saved automatically; Save stores up to 90 records locally. Delete individual records, delete all records, or clear browser site data. Ordinary website analytics remain separate.
Classification references checked November 3, 2026. This tool is maintained by ToolKnit and is not a medical service.
For children, pregnancy, unusually high muscle mass or an individual health concern, use an appropriate clinical assessment rather than interpreting this adult table alone.