ToolHub

BMI Calculator

BMI 计算器

Body Mass Index (BMI) is a simple number that uses your height and weight to estimate body fat. Enter your values below — everything is calculated in your browser.

身体质量指数（BMI）是一个用身高和体重估算体脂的简单数值。输入下面的值，所有计算都在你的浏览器中完成。

Note: BMI is a screening tool, not a diagnosis. Athletes, pregnant people, and children should interpret it differently. Talk to a clinician for personal medical advice. 说明：BMI 是一个筛查工具，不是诊断。运动员、孕妇和儿童需要按不同的方式解读。个性化医疗建议请咨询医生。

How is BMI calculated?

BMI 是如何计算的？

For metric units the formula is BMI = weight (kg) / height (m)². For imperial units it becomes BMI = 703 × weight (lb) / height (in)². The resulting number is then placed in a category:

公制公式为 BMI = 体重 (kg) / 身高 (m)²。英制公式为 BMI = 703 × 体重 (lb) / 身高 (in)²。结果按下面的分类：

  • Below 18.5 — Underweight
  • 低于 18.5 —— 偏瘦
  • 18.5 – 24.9 — Normal weight
  • 18.5 – 24.9 —— 正常
  • 25.0 – 29.9 — Overweight
  • 25.0 – 29.9 —— 超重
  • 30.0 and above — Obese
  • 30.0 及以上 —— 肥胖

Read the full BMI guide to understand the math, the categories, and the limits of this metric.

阅读完整的 BMI 指南 了解公式、分类与该指标的局限性。