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BMI Calculator

Calculate your Body Mass Index (BMI) and understand your weight status for better health management

What is BMI (Body Mass Index)?

Body Mass Index (BMI) is a widely used screening tool that estimates body fat based on a person's height and weight. It's calculated by dividing weight in kilograms by the square of height in meters (kg/m²). BMI provides a simple numeric measure that helps categorize individuals into different weight categories.

Our free BMI calculator allows you to quickly calculate your BMI using either metric (kilograms and centimeters) or imperial (pounds and feet/inches) measurements. The calculator provides instant results along with your BMI category and health status interpretation.

Why Calculate BMI?

  • Health Screening: Quick assessment of weight status relative to height
  • Health Risk Awareness: Understand potential health risks associated with weight
  • Goal Setting: Set realistic weight management goals
  • Progress Tracking: Monitor changes in body composition over time
  • Medical Reference: Healthcare providers use BMI as a screening tool

BMI Categories:

  • Underweight: BMI below 18.5 - May indicate nutritional deficiencies
  • Normal Weight: BMI 18.5-24.9 - Generally considered healthy range
  • Overweight: BMI 25-29.9 - May increase health risks
  • Obesity Class I: BMI 30-34.9 - Moderate obesity
  • Obesity Class II: BMI 35-39.9 - Severe obesity
  • Obesity Class III: BMI 40+ - Extreme obesity

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Your BMI Result

Enter your weight and height to calculate BMI

Complete Guide to BMI

Body Mass Index (BMI) is a measure of body fat based on height and weight. It's calculated by dividing weight in kilograms by the square of height in meters (BMI = kg/m²). This simple formula provides a standardized way to assess weight status across different populations.

Understanding BMI Categories:

  • Underweight (BMI < 18.5): May indicate nutritional deficiencies, eating disorders, or other health conditions. Consult a healthcare provider if you're consistently underweight.
  • Normal Weight (BMI 18.5-24.9): Generally considered a healthy range. This category is associated with lower risk of weight-related health problems.
  • Overweight (BMI 25-29.9): May increase risk of developing health conditions like high blood pressure, type 2 diabetes, and heart disease.
  • Obesity Class I (BMI 30-34.9): Moderate obesity associated with increased health risks. Weight management strategies are recommended.
  • Obesity Class II (BMI 35-39.9): Severe obesity with significantly increased health risks. Medical supervision recommended.
  • Obesity Class III (BMI 40+): Extreme obesity with very high health risks. Professional medical guidance essential.

How to Use BMI Results:

  • As a Screening Tool: BMI is a starting point for health assessment, not a diagnostic tool
  • Regular Monitoring: Track your BMI over time to monitor changes in weight status
  • Goal Setting: Use BMI categories to set realistic weight management goals
  • Health Discussions: Use BMI as a reference point when discussing health with medical professionals

BMI Limitations and Considerations:

While BMI is a useful screening tool, it has limitations that are important to understand:

  • Muscle Mass: BMI doesn't distinguish between muscle and fat. Athletes and bodybuilders may have high BMI due to muscle mass, not excess fat
  • Body Composition: Two people with the same BMI can have very different body compositions
  • Age and Gender: BMI doesn't account for age-related changes or gender differences in body composition
  • Bone Density: People with higher bone density may have higher BMI without excess fat
  • Fat Distribution: BMI doesn't indicate where fat is distributed (visceral vs. subcutaneous)
  • Ethnicity: Some ethnic groups may have different health risks at the same BMI level

When to Consult a Healthcare Professional:

  • If your BMI falls outside the normal range and you're concerned about your health
  • If you're an athlete or have high muscle mass
  • If you're experiencing unexplained weight changes
  • If you have health conditions affected by weight
  • For personalized health advice and weight management strategies

Important Medical Disclaimer:

This BMI calculator is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or weight management.