A BMI below 18.5 is underweight. Health risks and guidance for gaining weight safely.
The BMI Calculator (Body Mass Index) provides a quick screening of your weight category based on weight and height. Used by health professionals and organizations like the WHO, BMI is a standard metric to check if you are Underweight, Normal Weight, Overweight, or Obese. This tool supports both Metric (cm/kg) and Imperial (ft/lbs) units. While BMI is a useful general indicator, it does not measure body fat directly or account for muscle mass, so it should be used as a starting point for understanding your general health status alongside professional advice.