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Free Online Calculator
BMI Calculator
Calculate your Body Mass Index instantly using your height and weight, then see your BMI category and a simple health-range reference.
Enter Your Details
Choose a unit system and enter your height and weight.
cm
Recommended range: 50–300 cm
kg
Recommended range: 1–500 kg
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Formula: BMI = weight (kg) ÷ height² (m). The calculator converts imperial measurements automatically.
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BMI Result
Your Body Mass Index overview
Your BMI
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Enter your details to calculate
Underweight
Healthy
Overweight
Obesity
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Height
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Weight
Interpretation
Your BMI category will appear here after calculation.
Important:
BMI is a screening measure and does not directly measure body fat or overall health.
Simple Formula
BMI uses your weight relative to your height to provide a quick numerical screening measure.
Instant Calculation
Switch between metric and imperial units and get your result immediately.
Mobile Friendly
A clean responsive interface designed for phones, tablets, and desktop screens.
Adult BMI Reference
Common adult screening categories.
Underweight
< 18.5
Healthy
18.5 – 24.9
Overweight
25.0 – 29.9
Obesity
30.0+
BMI calculated