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BMI Calculator

Calculate your BMI with metric or imperial units and see your category.

Enter your weight and height

🔒 All calculations happen in your browser — no data is sent to any server. BMI is a screening tool, not a diagnostic measure.

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BMI Calculator — Body Mass Index

Body Mass Index (BMI) is a simple measure that uses your weight and height to estimate whether you are underweight, normal weight, overweight, or obese. Our free BMI calculator supports both metric (kg/cm) and imperial (lbs/feet-inches) units. Enter your measurements and instantly see your BMI value, category, and where you fall on the BMI scale. Important: BMI is a screening tool, not a diagnostic measure — consult a healthcare professional for a complete health assessment.

How to use BMI Calculator

  • Select Metric (kg/cm) or Imperial (lbs/ft-in) units.
  • Enter your weight and height.
  • Your BMI is calculated instantly with your category shown.
  • See the visual BMI scale and your healthy weight range.

Features

  • Metric and imperial units — Switch between kg/cm and lbs/ft-in instantly.
  • Visual BMI scale — Color-coded scale showing Underweight, Normal, Overweight, and Obese ranges.
  • Healthy weight range — Shows the ideal weight range for your height.
  • Real-time calculation — Results update as you type.
  • Educational breakdown — WHO BMI category definitions explained.
  • 100% private — Your health data never leaves your browser.

Frequently Asked Questions

How is BMI calculated?

BMI is calculated by dividing your weight in kilograms by your height in meters squared (BMI = kg / m²). For imperial units, the formula is: BMI = (weight in pounds × 703) / (height in inches)². Our calculator handles both automatically.

What is a healthy BMI range?

According to the WHO, a BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25.0–29.9 is overweight, and 30.0 or above is obese. These ranges apply to adults and may vary by age and ethnicity.

Is BMI accurate for athletes?

BMI does not distinguish between muscle and fat. Athletes with high muscle mass may have an elevated BMI despite having low body fat. For a more accurate assessment, consider body fat percentage measurements or consult a healthcare provider.