BMI计算器
计算身体质量指数(BMI)，支持公制和英制单位，含健康范围参考。
偏瘦< 18.5
正常18.5 - 24.9
超重25 - 29.9
肥胖30+
Frequently Asked Questions
How accurate is BMI?
BMI is a useful screening tool for population-level health, but it has limitations. It doesn't distinguish between muscle and fat, so very muscular people may be classified as "overweight" despite being healthy. Use it as a general guide, not a diagnosis.
What is a healthy BMI range?
18.5 to 24.9 is considered healthy for most adults. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese. However, age, muscle mass, and ethnicity can affect what's healthy for you.
How do I calculate my BMI?
BMI = weight(kg) / height(m)². Our calculator does this instantly — just enter your weight and height in either metric or imperial units.
Is BMI different for men and women?
The formula is the same, but healthy body composition differs. Women naturally carry more body fat than men at the same BMI. The CDC uses the same BMI categories for both, but individual health assessments should consider body composition.