⚖️ BMI Calculator (Body Mass Index)
Calculate Body Mass Index (BMI) from weight and height and see the WHO weight-status category. Free, instant, and computed in your browser — no data leaves your device.
Screening tool only — interpret with waist circumference and clinical context.
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When to use
Quick screening of weight status in adults. Not a diagnosis and does not separate fat from muscle.
How it works
BMI = weight(kg) / height(m)². Categories: < 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, ≥ 30 obese.
Key points
- Screening tool only — interpret with waist circumference and clinical context.
- Asian-population thresholds for overweight/obesity are lower (≥ 23 / ≥ 27.5).
- Muscular individuals may be misclassified as overweight.
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Weight | 70 kg |
|---|---|
| Height | 170 cm |
→BMI24.2kg/m²
- Category (WHO)：Normal weight
- Healthy range：18.5–24.9 kg/m²
Frequently asked questions
- What is BMI Calculator (Body Mass Index)?
- Calculate Body Mass Index (BMI) from weight and height and see the WHO weight-status category. Free, instant, and computed in your browser — no data leaves your device.
- How is BMI Calculator (Body Mass Index) calculated? What is the core formula?
- BMI = weight(kg) / height(m)². Categories: < 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, ≥ 30 obese.
- When is BMI Calculator (Body Mass Index) used?
- Quick screening of weight status in adults. Not a diagnosis and does not separate fat from muscle.
- What are the key clinical points for BMI Calculator (Body Mass Index)?
- Screening tool only — interpret with waist circumference and clinical context. Asian-population thresholds for overweight/obesity are lower (≥ 23 / ≥ 27.5). Muscular individuals may be misclassified as overweight.
- What are the limits and cautions when using BMI Calculator (Body Mass Index)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is BMI Calculator (Body Mass Index) calculated in practice? Can you show a worked example?
- Inputs: Weight 70 kg, Height 170 cm → Result: BMI 24.2 kg/m²（Category (WHO): Normal weight, Healthy range: 18.5–24.9 kg/m²）