如何線上計算 BMI - 身體質量指數指南

What is BMI?

BMI (Body Mass Index) is a simple calculation using your height and weight to determine if you're at a healthy weight. It's widely used by healthcare professionals worldwide.

BMI Formula

``
BMI = weight (kg) / height² (m²)
`

Or in imperial units:
`
BMI = 703 × weight (lbs) / height² (in²)
``

WHO BMI Categories

| Category | BMI Range |
|----------|-----------|
| Underweight | Below 18.5 |
| Normal weight | 18.5 - 24.9 |
| Overweight | 25.0 - 29.9 |
| Obese Class I | 30.0 - 34.9 |
| Obese Class II | 35.0 - 39.9 |
| Obese Class III | 40.0 and above |

How to Use the BMI Calculator

Step 1: Enter Your Details

Go to the BMI Calculator and input:

Height: In centimeters or feet/inches

Weight: In kilograms or pounds

Step 2: Calculate

Click calculate to get your BMI score and classification.

Step 3: Review Results

The calculator shows:

Your BMI number

Weight category

Healthy weight range for your height

Limitations of BMI

BMI is a useful screening tool but doesn't account for:

Muscle mass (athletes may have higher BMI)

Bone density

Body composition

Age and gender differences

Tips for Healthy Weight

Balanced Diet: Eat plenty of fruits, vegetables, and whole grains

Regular Exercise: At least 150 minutes of moderate activity per week

Stay Hydrated: Drink 8 glasses of water daily

Sleep Well: Aim for 7-9 hours of quality sleep

Monitor Progress: Check your BMI monthly

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