什么是身体质量指数 (BMI)?
BMI 是全球通用的简易评估工具,用于评估个人的体重与身高比例是否处于健康范围。
虽然计算简便,但它无法直接分辨肌肉与脂肪。
成人 BMI 分类标准 (WHO)
适用于 20 岁以上成人的 WHO 标准分类。
| 分类 | BMI 范围 (kg/m²) |
|---|---|
| 重度消瘦 | < 16.0 |
| 中度消瘦 | 16.0 - 16.9 |
| 轻度消瘦 | 17.0 - 18.4 |
| 体重正常 | 18.5 - 24.9 |
| 过重 (肥胖前期) | 25.0 - 29.9 |
| 轻度肥胖 | 30.0 - 34.9 |
| 中度肥胖 | 35.0 - 39.9 |
| 重度肥胖 | ≥ 40.0 |

BMI table for children and teens, age 2-20
The Centers for Disease Control and Prevention (CDC) recommends BMI categorization for children and teens between age 2 and 20.
| Category | Percentile Range |
|---|---|
| Underweight | < 5% |
| Healthy weight | 5% - 85% |
| At risk of overweight | 85% - 95% |
| Overweight | > 95% |
BMI chart for children and teens, age 2-20
The Centers for Disease Control and Prevention (CDC) BMI-for-age percentiles growth charts.
BMI = 703 ×
mass (lbs)height2 (in)
BMI =
mass (kg)height2 (m)
BMI prime =
BMI25
| 分类 | BMI | BMI Prime |
|---|---|---|
| 重度消瘦 | < 16 | < 0.64 |
| 中度消瘦 | 16 - 17 | 0.64 - 0.68 |
| 体重正常 | 18.5 - 25 | 0.74 - 1 |
| 过重 (肥胖前期) | 25 - 30 | 1 - 1.2 |
| > 30 | > 1.2 |
PI =
height (in)√3 mass (lbs)
PI =
mass (kg)height3 (m)
常见问题
问:健康的 BMI 范围是多少?
答:根据 WHO 标准,18.5 至 24.9 为健康范围。
问:BMI 对每个人都准确吗?
答:BMI 为估算值,运动员可能因肌肉量高而被高估体脂。

