Free BMI Calculator
Calculate your Body Mass Index using your age, gender, height, and weight. Choose the units that work best for you.
Adult calculator: 20 years and older
Used for personal context; adult BMI thresholds are the same.
Understanding Your BMI
BMI is a simple screening measure based on height and weight. For adults, it is commonly used to classify BMI into broad weight categories.
Underweight
BMI below 18.5
Normal
BMI 18.5 – 24.9
Overweight
BMI 25 – 29.9
Obesity
BMI 30 or higher
BMI is a screening measure and should not be used by itself to diagnose a health condition.
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