BMI Weight Calculator

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📋 BMI Classification Reference

Category China Standard (BMI) WHO International Standard (BMI) Health Risk
Underweight < 18.5 < 18.5 Increased Risk of Malnutrition
Normal 18.5 – 23.9 18.5 – 24.9 Lowest Health Risk
Overweight 24 – 27.9 25 – 29.9 Slightly Increased Risk of Chronic Disease
Obesity Class I 28 – 31.9 30 – 34.9 Moderately Increased Risk of Chronic Disease
Obesity Class II 32 – 36.9 35 – 39.9 Severely Increased Risk of Chronic Disease
Obesity Class III ≥ 37 ≥ 40 High Risk of Chronic Disease

📖 About BMI

BMI(Body Mass Index)BMI (Body Mass Index) was proposed by Belgian mathematician Adolphe Quetelet in 1832. It is calculated by dividing body weight (kg) by the square of height (m), and is commonly used to assess whether body weight falls within a healthy range.

Calculation Formula:
BMI = Weight (kg)÷ Height (m)²
Notes:
  • BMI Does not distinguish between fat and muscle; athletes may have higher BMI without being overweight
  • BMI Does not reflect fat distribution; abdominal obesity (apple shape) carries higher risk than hip obesity (pear shape)
  • Asians generally have higher body fat percentage at the same BMI compared to Western populations, so Chinese standards use lower thresholds
  • Children and adolescents should be assessed using age- and gender-specific BMI percentiles
  • Special groups such as pregnant women and the elderly should be evaluated with additional indicators
⚠️ Disclaimer:This tool is for reference only and does not constitute medical advice. Please consult a healthcare professional if you have health concerns.