Online BMI Calculator

Online BMI Calculator

Underweight (<18.5) Normal (18.5-24.9) Overweight (25-29.9) Obesity (30+)
BMI Categories:
  • Underweight: BMI less than 18.5
  • Normal weight: BMI 18.5–24.9
  • Overweight: BMI 25–29.9
  • Obesity: BMI 30 or greater

BMI Calculator - How to Calculate Your Body Mass Index

This online BMI calculator helps you determine your Body Mass Index (BMI) - a measure of body fat based on your height and weight. BMI is used by healthcare professionals to screen for weight categories that may lead to health problems.

How to Calculate BMI

Enter your height in centimeters, feet and inches, or inches only, then enter your weight in kilograms and click "Calculate BMI". The calculator uses the standard BMI formula:

BMI = Weight (kg) / (Height (m))²

Your result will show:

  • Your exact BMI value
  • Your weight category (Underweight, Normal, Overweight, or Obesity)
  • A visual indicator showing where your BMI falls on the scale
  • The standard BMI categories for reference

Understanding Your BMI Results

BMI is a useful screening tool, but it has limitations:

  • It doesn't measure body fat directly
  • Muscular individuals may have a high BMI without excess fat
  • It may not be accurate for the elderly, children, or pregnant women

For a complete health assessment, consult your doctor or a healthcare professional.