Calculate your Body Mass Index (BMI) in seconds. Supports both metric (kg/cm) and imperial (lb/inches) units.
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Body Mass Index (BMI) is a screening measure that uses your height and weight to estimate weight status. Enter your measurements and our calculator shows your BMI value and category — Underweight, Normal, Overweight, or Obese — in both metric and imperial units.
BMI equals weight in kilograms divided by height in metres squared. A person weighing 70kg at 1.75m tall has a BMI of 70 divided by 3.0625, which equals 22.9. In imperial units, BMI equals weight in pounds multiplied by 703, divided by height in inches squared.
BMI is a population-level screening tool, not a diagnostic measure. It does not directly measure body fat. Muscular individuals often show as overweight despite low body fat. Older adults may have normal BMI but high body fat. BMI also ignores fat distribution — abdominal fat carries greater health risk than fat elsewhere. Always consult a healthcare professional for personalised health assessment.
The standard BMI categories apply to adults aged 18 to 65. For children and teenagers, BMI is assessed differently using age-specific growth charts and expressed as a percentile rather than a fixed category. For older adults over 65, research suggests that a slightly higher BMI in the range of 25 to 27 may be protective against some health risks. Always interpret BMI in the context of age and consult a healthcare professional for personalised guidance.
BMI has well-documented limitations as a standalone health measure. Waist circumference is a useful complement as abdominal fat above 88cm for women or 102cm for men indicates increased cardiovascular risk regardless of BMI. Body fat percentage, measured by DEXA scan or bioelectrical impedance, provides the most direct assessment of body composition and is more informative than BMI alone for athletes and muscular individuals.
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