BMI Calculator - Body Mass Index Calculator

How to Use the BMI Calculator

Step 1: Choose Unit System

Select your preferred unit system:

• Metric: Use centimeters and kilograms
• Imperial: Use feet, inches, and pounds

Step 2: Enter Height

• Metric: Enter your height in centimeters
• Imperial: Enter feet and inches separately

Step 3: Enter Weight

• Metric: Enter your weight in kilograms
• Imperial: Enter your weight in pounds

Step 4: View Results

The system will automatically calculate and display:

• Your BMI value
• Weight classification status
• Health recommendations
• Healthy weight range

Usage Tips

• Press Tab to move between input fields
• Press Enter for quick calculation
• Decimal input is supported for precise measurements
• Measure weight under the same conditions for accuracy

What is BMI?

BMI (Body Mass Index) is a widely used screening tool to calculate whether your weight is healthy relative to your height. BMI was developed by Belgian mathematician Adolphe Quetelet in the 1830s and has become the global standard for assessing adult weight categories.

BMI Calculation Formula

The BMI calculation formula is simple:

• Metric Units: BMI = weight (kg) / height (m)²
• Imperial Units: BMI = weight (lbs) / height (inches)² × 703

BMI Classification Standards

According to World Health Organization (WHO) standards:

• Underweight: BMI < 18.5
• Normal weight: BMI 18.5-24.9
• Overweight: BMI 25.0-29.9
• Obese: BMI ≥ 30.0

Importance of BMI

BMI is a useful health indicator that can help:

• Assess weight-related health risks
• Set reasonable weight management goals
• Monitor weight change trends
• Serve as a reference for medical evaluation

Our Calculator Advantages

• Dual Unit Support: Supports both metric (cm/kg) and imperial (ft/in/lbs)
• Real-time Calculation: Instant results as you type
• Detailed Interpretation: Provides BMI classification and health advice
• Responsive Design: Adapts to all device screens
• Multi-language Support: English and Chinese interface