BMI Calculator

Free Online BMI Calculator

This tool supports both metric (cm/kg) and imperial (ft/lb) unit modes. Enter your height and weight to instantly calculate your BMI value, with health classification, ideal weight range, and a visual color band based on WHO standards. All data is processed locally in your browser and never uploaded to any server, fully protecting your privacy.

Features

• Supports both metric and imperial modes with automatic conversion
• Real-time BMI calculation accurate to one decimal place
• WHO standard four-level health classification (Underweight/Normal/Overweight/Obese)
• Calculates ideal weight range based on height
• Visual BMI color band showing your current position
• Fully client-side offline calculation protecting your privacy

Formulas

• BMI = Weight(kg) ÷ Height(m)²
• Ideal weight lower bound = 18.5 × Height(m)²
• Ideal weight upper bound = 24.9 × Height(m)²
• 1 inch = 2.54 cm
• 1 lb = 0.453592 kg

Reference Standards

• WHO BMI Classification Standard (International)
• Underweight: BMI < 18.5
• Normal: BMI 18.5–24.9
• Overweight: BMI 25–29.9
• Obese: BMI ≥ 30

How to Use

1. 1Select metric or imperial unit mode
2. 2Enter your height (cm in metric, ft and in in imperial)
3. 3Enter your weight (kg in metric, lb in imperial)
4. 4View your BMI value, health classification, and ideal weight range