BMI Calculator
Calculate β
About this tool
BMI (Body Mass Index) is a measure of body fat based on height and weight. Standard mode uses feet/inches and pounds. Metric mode uses centimeters and kilograms.
BMI Categories: Underweight < 18.5, Normal 18.5β24.9, Overweight 25β29.9, Obese β₯ 30.
Note: BMI is a screening tool, not a diagnostic measure.
Frequently asked questions
How is BMI calculated?
BMI equals weight in kilograms divided by height in metres squared. The tool supports both metric and imperial units.
What do the BMI categories mean?
Per WHO guidelines: under 18.5 is underweight, 18.5β24.9 normal, 25β29.9 overweight and 30 or above obese.
Is BMI accurate for everyone?
BMI is a quick general indicator and ignores muscle mass and body composition, so athletes can read high. Treat it as a rough guide.