BMI Calculator
Calculate BMI from height and weight. Supports metric (cm/kg) and imperial (ft/lbs) units. Visual category indicator with healthy weight range.
About this tool
BMI (Body Mass Index) is a simple measure of body fat based on height and weight. It is calculated as weight in kilograms divided by height in meters squared. While not perfect, it provides a useful general indicator of healthy weight.
This calculator supports both metric and imperial units. All calculations happen in your browser.
infoBMI Categories
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BMI is a screening tool, not a diagnostic measure. It may not be accurate for athletes, elderly, or pregnant women. Consult a healthcare provider for a complete assessment.
Frequently Asked Questions
How is BMI calculated?
BMI = weight (kg) / height (m) squared. For example, 80kg and 1.80m gives BMI = 80 / (1.8 x 1.8) = 24.7.
What are the BMI categories?
Underweight: below 18.5, Normal: 18.5 to 24.9, Overweight: 25 to 29.9, Obese: 30 and above. These are WHO standard categories.
Is BMI accurate for everyone?
BMI is a general screening tool. It may not be accurate for athletes with high muscle mass, elderly, or pregnant women. Consult a healthcare provider for personalized assessment.