BMI Calculator (Body Mass Index)
Calculate your Body Mass Index (BMI), identify your WHO health category, and discover your ideal healthy weight target.
Adult BMI Classification Table
The international standard classification adopted by the World Health Organization (WHO):
| Category | BMI Range (kg/m²) | Health Risk Assessment |
|---|---|---|
| Underweight | < 18.5 | May indicate malnutrition, eating disorder, or other health issues. |
| Normal Weight | 18.5 – 24.9 | Lowest risk of serious health conditions for most adults. |
| Overweight | 25.0 – 29.9 | Increased risk of cardiovascular disease and type 2 diabetes. |
| Obesity Class I | 30.0 – 34.9 | Moderate obesity with elevated risk of weight-related health problems. |
| Obesity Class II/III | 35.0+ | High risk of health complications; consult a healthcare professional. |
BMI Calculator FAQs
Common medical and practical questions about Body Mass Index.
What is a healthy BMI for adults?
According to the World Health Organization (WHO), a healthy BMI for adults is between 18.5 and 24.9 kg/m². However, for Asian populations, many health authorities recommend a cutoff of 23 kg/m² for overweight risk due to higher abdominal body fat percentages.
Does BMI differentiate between muscle and fat?
No. BMI does not distinguish between lean muscle mass and adipose fat tissue. Athletes and bodybuilders with high muscle mass may have a high BMI despite having low body fat. BMI is best used as a population-level screening metric rather than a definitive diagnosis.
How is BMI calculated manually?
In the metric system: BMI = Weight (kg) ÷ [Height (m)]². For example, if you weigh 70 kg and stand 1.75 m tall: 70 ÷ (1.75 × 1.75) = 70 ÷ 3.0625 = 22.86 kg/m².
Is my height and weight recorded on your servers?
Never. pdfriend is built on a 100% private, client-side architecture. All calculations run strictly in your device's memory, ensuring total health privacy.
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