BMI Calculator

Calculate your Body Mass Index (BMI) and determine if you're at a healthy weight for your height.

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Your BMI Results

Enter your height and weight to calculate your BMI

BMI Categories

BMI Range Category Health Risk
Below 18.5 Underweight Increased risk for health problems
18.5 - 24.9 Normal weight Lowest risk for health problems
25.0 - 29.9 Overweight Increased risk for health problems
30.0 - 34.9 Obesity (Class 1) High risk for health problems
35.0 - 39.9 Obesity (Class 2) Very high risk for health problems
40.0 and above Obesity (Class 3) Extremely high risk for health problems

About BMI

Body Mass Index (BMI) is a numerical value of your weight in relation to your height. It's a commonly used indicator to categorize individuals as underweight, normal weight, overweight, or obese.

How BMI is Calculated

BMI is calculated using a simple formula that divides a person's weight by the square of their height.

BMI = weight(kg) / height(m)²

For imperial units:

BMI = [weight(lbs) / height(in)²] × 703

Limitations of BMI

While BMI is a useful screening tool, it has several limitations:

  • It doesn't account for muscle mass, bone density, or body composition
  • Athletes may have a high BMI due to muscle mass despite low body fat
  • It may not be accurate for elderly individuals who have lost muscle mass
  • It doesn't consider where fat is distributed in the body
  • BMI ranges may vary for different ethnic groups

Health Recommendations

If your BMI falls outside the normal range, consider these recommendations:

  • Underweight: Consult with a healthcare provider about healthy weight gain strategies
  • Normal weight: Maintain your weight with balanced diet and regular physical activity
  • Overweight: Consider moderate weight loss through improved diet and increased physical activity
  • Obese: Seek medical advice for a comprehensive weight management plan

Always consult with healthcare professionals before making significant changes to your diet or exercise routine.

Frequently Asked Questions

Is BMI accurate for everyone?
No, BMI has limitations. It doesn't distinguish between muscle and fat, so athletes or muscular individuals may have a high BMI despite being healthy. It also may not be accurate for elderly people, pregnant women, or certain ethnic groups who may have different body compositions.
What should I do if my BMI indicates I'm overweight?
If your BMI indicates you're overweight, it's advisable to consult with a healthcare provider. They can assess your overall health and provide personalized advice. Generally, a combination of balanced diet, regular physical activity, and lifestyle changes can help achieve a healthier weight.
How often should I check my BMI?
For most adults, checking BMI once or twice a year is sufficient unless you're actively trying to change your weight or have been advised by a healthcare provider to monitor it more frequently. Significant weight changes should be discussed with a healthcare professional.
Are there better alternatives to BMI?
Yes, there are more comprehensive measurements like body fat percentage, waist circumference, waist-to-hip ratio, and body composition analysis. These can provide more detailed information about your health status. However, they may require specialized equipment or professional assessment.

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