BMI (Body Mass Index) Calculator

Calculate your Body Mass Index and check your weight category

Calculate Your BMI

Metric Imperial

Your Results

0.0
BMI Category
<18.5 18.5-24.9 25-29.9 30+ 40+
Your BMI result will appear here with personalized feedback.

Understanding BMI Categories

Underweight

BMI less than 18.5

May indicate malnutrition, an eating disorder, or other health issues requiring attention.

Normal Weight

BMI 18.5 to 24.9

Indicates that your weight is healthy for your height. Maintain a balanced diet and regular exercise.

Overweight

BMI 25 to 29.9

May lead to health problems, especially if it increases. Consider lifestyle adjustments.

Obese (Class 1 & 2)

BMI 30 to 39.9

Increased risk of developing heart disease, high blood pressure, type 2 diabetes, etc.

Extremely Obese (Class 3)

BMI 40 or higher

Severe health risks. Consult healthcare providers for appropriate weight management strategies.

How to Use BMI (Body Mass Index) Calculator

Simple Steps:

  1. Choose your preferred unit system (Metric or Imperial) using the toggle switch.
  2. Enter your height:
    • In centimeters if using Metric
    • In feet and inches if using Imperial
  3. Enter your weight:
    • In kilograms if using Metric
    • In pounds if using Imperial
  4. Click the "Calculate BMI" button.
  5. View your BMI result, category, and position on the BMI scale.

Understanding Your Results:

Your BMI will fall into one of these categories:

  • Below 18.5: Underweight
  • 18.5 to 24.9: Normal weight
  • 25 to 29.9: Overweight
  • 30 to 34.9: Obesity Class 1
  • 35 to 39.9: Obesity Class 2
  • 40 and above: Extreme Obesity (Class 3)

Important Notes:

  • BMI is a screening tool, not a diagnostic test. It has limitations and doesn't account for muscle mass, bone density, or body fat distribution.
  • Athletes with high muscle mass may have a higher BMI despite being in good health.
  • BMI calculations for children and teens are different from adults and involve age and gender-specific considerations.
  • Always consult with healthcare professionals for a comprehensive health assessment.

BMI Formula Explained

Metric Formula:

BMI = weight(kg) / height²(m)

Example: A person weighing 70 kg and 170 cm tall

BMI = 70 / (1.7 × 1.7) = 24.22

Imperial Formula:

BMI = 703 × weight(lb) / height²(in)

Example: A person weighing 154 lbs and 5'7" tall (67 inches)

BMI = 703 × 154 / (67 × 67) = 24.11

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