免费BMI计算器
根据身高和体重计算身体质量指数(BMI)，了解体重是否在健康范围内。
BMI
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BMI vs Weight
身体质量指数（BMI）计算器是一种根据身高和体重评估体型的常用工具。BMI为医疗专业人员提供了一个快速筛查指标，帮助判断体重是否在健康范围内。
公式
BMI通过以下公式计算：BMI = (体重 × 703) / 身高²（英制单位，体重为磅，身高为英寸）。如果使用公制单位，则为 BMI = 体重(kg) / 身高(m)²，无需乘以703。
- BMI = 身体质量指数（计算结果）
- 体重 = 体重（英制为磅，公制为千克）
- 身高 = 身高（英制为英寸，公制为米）
- 703 = 英制单位转换系数（仅英制使用）
分步解答
- 01输入您的体重（可选择千克或磅）。
- 02输入您的身高（可选择米/厘米或英尺/英寸）。
- 03系统根据公式计算您的BMI数值。
- 04根据世界卫生组织标准分类：低于18.5为体重过轻，18.5-24.9为正常，25-29.9为超重，30以上为肥胖。
计算示例
假设您的体重为70千克，身高为1.75米。
- 01体重 = 70 kg
- 02身高 = 1.75 m
- 03代入公制公式：BMI = 70 / (1.75)²
- 04计算：BMI = 70 / 3.0625 ≈ 22.86
- 05结果分类：BMI 22.86 属于正常范围（18.5–24.9）
BMI是一个有用的初步筛查工具，但它有局限性——它不能区分肌肉和脂肪，也不考虑年龄、性别、骨骼结构和脂肪分布。运动员或肌肉发达的人可能BMI较高但体脂率并不高。建议结合其他指标（如体脂率、腰围）综合评估。
常见问题
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25-29.9 is overweight, and 30 or above is classified as obese. However, BMI does not account for muscle mass, bone density, or body composition.
Is BMI accurate?
BMI is a useful screening tool but has limitations. It may overestimate body fat in athletes with high muscle mass and underestimate it in older adults who have lost muscle. It does not distinguish between fat and lean tissue.
What is a good BMI for my age?
For adults, the standard BMI categories apply regardless of age (18.5-24.9 is normal). However, older adults (65+) may have healthier outcomes at a slightly higher BMI (23-27). For children and teens, BMI is interpreted using age- and sex-specific growth charts.
Can I have a healthy BMI but still have too much body fat?
Yes. This is sometimes called "normal weight obesity" or "skinny fat." A person with low muscle mass and high body fat can fall in the normal BMI range while still carrying unhealthy levels of visceral fat. Body fat percentage tests give a more accurate picture.
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