BMI Calculator

Check your Body Mass Index and see which weight category you fall into.

WiseClick provides estimates only, not medical advice. Consult a healthcare professional.

Your BMI
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BMI Category
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Healthy Weight Range
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Note
BMI does not distinguish between muscle and fat mass. Athletes or muscular individuals may show a high BMI despite having low body fat. This is a screening tool, not a comprehensive health assessment.

Understanding BMI

Body Mass Index (BMI) is a widely used screening measure that estimates body fat based on your height and weight. The formula is:

  • Metric: BMI = weight(kg) / height(m)2
  • Imperial: BMI = weight(lbs) × 703 / height(in)2

BMI Categories

  • Underweight: BMI < 18.5
  • Normal weight: BMI 18.5 – 24.9
  • Overweight: BMI 25.0 – 29.9
  • Obese: BMI 30.0+

These categories are defined by the World Health Organization and apply to adults aged 20 and older. BMI ranges may differ for certain ethnic groups.

BMI Limitations

While BMI is a useful population-level screening tool, it has important limitations for individuals:

  • Does not measure body fat directly — it only uses height and weight.
  • Overestimates fat in muscular people — athletes may have a high BMI due to muscle mass, not excess fat.
  • Underestimates fat in older adults — age-related muscle loss can result in a normal BMI despite excess body fat.
  • No distinction between fat types — visceral fat (around organs) is more harmful than subcutaneous fat, but BMI cannot tell the difference.
  • Not suitable for children or pregnant women — different standards apply for these groups.

For a more complete picture of your health, consider combining BMI with other measurements such as waist circumference, body fat percentage, or a consultation with a healthcare provider.

Frequently Asked Questions

What is a healthy BMI range?

A BMI between 18.5 and 24.9 is generally considered a healthy range for adults. However, BMI does not account for muscle mass, bone density, or fat distribution, so it should be used alongside other health assessments rather than as a standalone measure.

How is BMI calculated?

BMI is calculated by dividing your weight in kilograms by the square of your height in meters: BMI = weight(kg) / height(m)^2. For imperial units, the formula is BMI = weight(lbs) x 703 / height(in)^2. The result is a single number that places you in a weight category.

Is BMI accurate for everyone?

BMI is a useful screening tool for the general population but has known limitations. It may overestimate body fat in athletes and muscular individuals, and underestimate it in older adults who have lost muscle mass. It also does not distinguish between fat and lean mass. For a comprehensive health assessment, consult a healthcare professional.

Disclaimer

This calculator is for educational and informational purposes only. It provides estimates based on general formulas and is not a substitute for professional medical advice, diagnosis, or guidance. BMI is a screening tool with known limitations and individual results vary. Always consult a qualified healthcare provider for a comprehensive assessment of your health and body composition.