BMI Calculator

Calculate Body Mass Index (BMI) from weight and height in metric (kg, cm) or imperial (lbs, feet/inches) units. Displays World Health Organization (WHO) weight category classifications (Underweight, Normal, Overweight, Obese) and healthy target weight ranges.

Why Use This Tool?

• Health & Fitness Tracking: Check your current BMI score against medical WHO standards.
• Healthy Target Weight Range: Calculate recommended healthy target weight bounds for your exact height.
• Metric & Imperial Support: Switch seamlessly between kg/cm and lbs/feet-inches.

How to Use

1. Select Metric (kg, cm) or Imperial (lbs, feet/inches) unit mode.
2. Enter your Weight and Height.
3. View calculated BMI score, WHO category gauge, and healthy weight range.

Real Working Example

Input:

Weight: 70 kg | Height: 175 cm (5 ft 9 in)

Output Result:

BMI Score: 22.86 kg/m² | Category: Normal Weight (Healthy) | Target Range: 56.7 kg – 76.6 kg

Important Technical Details & Formulas

• WHO Formula Standard: Metric `BMI = weight (kg) / [height (m)]²` and Imperial `BMI = 703 * weight (lbs) / [height (in)]²`.
• WHO Category Slabs: Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), Obese (≥30).
• 100% Local Privacy: Personal weight data stays private in browser memory.

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