BMI Calculator (Body Mass Index): What It Does
Calculates Body Mass Index (BMI) from metric or imperial height and weight. It provides standard WHO category classifications (underweight, normal, overweight, obesity) and ideal weight ranges.
Example
Weight: 70 kg, Height: 175 cmBMI: 22.86 (Normal weight)Divides weight in kilograms by height in meters squared (70 / 1.75^2).
How to Use
- Select metric (cm/kg) or imperial (feet/inches/lbs) measurement units.
- Enter height and weight into the inputs.
- Review the BMI score, weight category indicator, and healthy target range.
Limitations
- BMI does not distinguish between muscle mass, bone density, and body fat percentage.
- Standard categories may vary for athletes, pregnant women, and older adults.
Frequently Asked Questions
What are the standard WHO BMI categories?
Under 18.5 is underweight, 18.5 to 24.9 is normal weight, 25 to 29.9 is overweight, and 30 or higher indicates obesity.
Why is BMI considered a screening tool rather than a diagnostic measure?
BMI correlates with body fat on a population level, but cannot differentiate lean athletic muscle mass from adiposity in individuals.
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