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BMI calculator
Body Mass Index, in metric or imperial units.
Metric (kg / cm)
Imperial (lb / ft-in)
How it works
Uses the standard BMI formula — weight in kilograms divided by height in meters squared — with imperial inputs automatically converted to metric first. Categories (underweight, healthy, overweight, obese) follow the WHO's standard BMI ranges.
FAQ
- Is BMI an accurate measure of health?
- It's a population-level screening tool, not a diagnosis — it doesn't distinguish muscle from fat, so athletes and very muscular people are often misclassified as "overweight."
- Are the healthy ranges different for children?
- Yes — this calculator uses the adult BMI ranges; children and teens need age- and sex-specific percentile charts instead.
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