BMI Calculator

Calculate your Body Mass Index to assess if you're at a healthy weight

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Years (2-120)
cm
Centimeters (50-300)
kg
Kilograms (10-500)

📚 Understanding BMI

What is BMI?

Body Mass Index (BMI) is a simple calculation using a person's height and weight. It's a screening tool that can indicate whether a person is underweight, at a healthy weight, overweight, or obese. The formula is:

BMI = weight (kg) / height² (m²)

or

BMI = (weight (lbs) / height² (inches)) × 703

How to Interpret Your BMI

BMI provides a reasonable indicator of body fat for most people. However, it doesn't directly measure body fat percentage. The categories are:

  • Underweight: BMI less than 18.5
  • Normal weight: BMI 18.5 to 24.9
  • Overweight: BMI 25.0 to 29.9
  • Obese: BMI 30.0 or greater

Limitations of BMI

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

  • 💪 Muscle mass: Athletes and people with high muscle mass may have a high BMI despite having low body fat
  • 👴 Age: Older adults often have more body fat than younger adults with the same BMI
  • ⚧ Gender: Women typically have more body fat than men with the same BMI
  • 🌍 Ethnicity: BMI thresholds may vary for different ethnic groups
  • 🧬 Body composition: BMI doesn't distinguish between fat and muscle

When to See a Healthcare Provider

Consider consulting a healthcare provider if:

  • Your BMI is outside the normal range
  • You've experienced significant weight changes
  • You have concerns about your weight or health
  • You want personalized advice for weight management

💡 Remember: BMI is just one indicator of health. A comprehensive health assessment includes other factors like diet, physical activity, family history, and other health screenings.

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❓ Frequently Asked Questions

Is BMI accurate for everyone?

BMI is a useful screening tool for most adults, but it may not be accurate for athletes, elderly people, pregnant women, or those with significant muscle mass. It's best used as one of many health indicators.

What's the ideal BMI?

The "normal" BMI range is 18.5-24.9, but the ideal BMI varies by individual. Factors like age, gender, muscle mass, and overall health should be considered. Consult with a healthcare provider for personalized advice.

Can BMI be too low?

Yes, a BMI below 18.5 is considered underweight and can be associated with health risks including malnutrition, weakened immune system, and osteoporosis.

How often should I calculate my BMI?

For most people, checking BMI once a month is sufficient. If you're actively trying to change your weight, you might check every 2-4 weeks to track progress.

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