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BMI 计算器

通过身高和体重计算体质指数（BMI）。支持公制和英制单位，即时显示分类结果。

请输入身高（厘米）和体重（千克）

您的 BMI
输入身高和体重进行计算
BMI 是一种筛查工具，而非诊断标准。它不考虑肌肉量、骨密度或身体成分。如需个人化建议，请咨询医疗专业人员。

How to Use This Tool

  1. 1

    Select your unit system

    Choose between Metric (cm/kg) or Imperial (ft, in/lbs) depending on your preference.

  2. 2

    Enter your height

    Input your height in centimeters for metric, or feet and inches for imperial measurement.

  3. 3

    Enter your weight

    Type your weight in kilograms (metric) or pounds (imperial) into the weight field.

  4. 4

    Read your BMI result

    Your Body Mass Index is calculated instantly and displayed with a color-coded category: underweight, normal, overweight, or obese.

Frequently Asked Questions

What is BMI and how is it calculated?
BMI (Body Mass Index) is a measure of body fat based on height and weight. The metric formula is weight (kg) ÷ height (m)². The imperial formula is (weight (lbs) × 703) ÷ height (in)².
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is generally considered normal weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is classified as obese by the WHO.
Is BMI accurate for athletes or muscular people?
BMI does not distinguish between muscle and fat mass. Athletes with high muscle mass may have a high BMI but low body fat. Consider additional metrics like body fat percentage for a more complete picture.
Can I use this BMI calculator for children?
This calculator uses adult BMI categories. Pediatric BMI is assessed using age- and sex-specific percentile charts, which require a different tool.