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About This Tool
BMI Calculator computes your Body Mass Index from height and weight in either metric (cm/kg) or imperial (ft/lb) units. BMI is a widely used screening metric that classifies weight status into underweight, normal, overweight, and obese categories.
BMI is a quick, equipment-free first screen used by clinicians and fitness professionals. While it does not account for muscle mass or body composition, it is a useful baseline for tracking weight-related health trends over time.
Tip: BMI is a population-level screening tool, not a diagnostic. Athletes with high muscle mass often register as overweight by BMI despite being in excellent health. Use it alongside other measures, not in isolation.