Fitness and Health Calculators
Check body mass index with metric or imperial units and compare the result with standard adult BMI ranges.
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22.7
Body mass index
BMI Basics
A BMI calculator estimates body mass index from height and weight. BMI is a screening measure rather than a direct measure of body fat, but it remains widely used because it is quick to calculate and easy to compare across standard adult ranges.
The metric formula divides weight in kilograms by height in metres squared. The imperial formula uses pounds and inches and includes a conversion factor.
BMI = weight (kg) / height (m)^2
This is the standard metric expression for body mass index.
BMI = 703 x weight (lb) / height (in)^2
The constant 703 converts imperial units to the metric equivalent.
BMI categories are usually presented as underweight, healthy weight, overweight, and obesity ranges. These categories are used as broad screening bands, not as direct statements about an individual person's health status.
Because BMI does not measure fat distribution, muscle mass, age, or sex-specific body characteristics directly, it works best as an entry point for discussion rather than a complete health assessment.
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