BMI Calculator

Calculate your Body Mass Index

Instructions

  1. Enter your height in centimeters (or feet/inches if using imperial)
  2. Enter your weight in kilograms (or pounds if using imperial)
  3. Click "Calculate BMI" to see your result
  4. Review your BMI category and where you fall on the scale

Understanding Your BMI

BMI (Body Mass Index) is a measure of body fat based on height and weight:

  • Underweight: BMI less than 18.5
  • Normal weight: BMI 18.5 to 24.9
  • Overweight: BMI 25 to 29.9
  • Obese: BMI 30 or greater

Benefits of Knowing Your BMI

  • Health Awareness: Helps identify potential weight-related health risks
  • Goal Setting: Provides a baseline for weight management goals
  • Simple Measurement: Easy to calculate with just height and weight
  • Universal Standard: Recognized by health professionals worldwide
  • Progress Tracking: Useful for monitoring changes over time

Limitations to Consider

  • Doesn't directly measure body fat percentage
  • May not account for muscle mass (athletes may have high BMI without excess fat)
  • Doesn't consider age, sex, or body frame differences
  • Consult a healthcare professional for comprehensive health assessment

Frequently Asked Questions

What is BMI and why is it important?
BMI (Body Mass Index) is a numerical value calculated from your weight and height. It provides a simple way to categorize weight status that may indicate health risks. While not a direct measure of body fat, it correlates well with more direct measures and is widely used as a screening tool.
How accurate is BMI?
BMI is a useful general indicator but has limitations. It may overestimate body fat in muscular individuals and underestimate it in older people who have lost muscle mass. For most people, BMI provides a reasonable estimate of body fatness and associated health risks.
Can children use this BMI calculator?
This calculator is designed for adults (age 20+). Children and teens need a BMI calculator that accounts for age and sex-specific percentiles, as their body composition varies significantly with growth and development.
Should athletes worry about high BMI?
Athletes and very muscular individuals may have a high BMI without excess body fat. In these cases, BMI may overestimate body fat. Additional measurements like waist circumference or body fat percentage may provide more accurate assessments.
How often should I check my BMI?
For most adults, checking BMI every few months is sufficient unless you're actively trying to lose or gain weight. Significant changes in BMI (more than 1-2 points) may warrant discussion with a healthcare provider.