BMI (Body Mass Index) is a simple measure using your height and weight to estimate body fat. It is calculated as weight in kilograms divided by height in meters squared.

What are the BMI categories?

Underweight is below 18.5, Normal weight is 18.5 to 24.9, Overweight is 25 to 29.9, and Obese is 30 or above.

Is BMI accurate for everyone?

BMI is a useful screening tool but does not directly measure body fat. It may not be accurate for athletes, elderly individuals, or people with high muscle mass.

Does this tool store my data?

No. All calculations happen locally in your browser. Your height and weight are never sent to any server.

BMI Calculator

Calculate your Body Mass Index using metric or imperial units.

Weight (kg)

Height (cm)

Your BMI

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BMI Scale

1018.5253040

UnderweightNormalOverweightObese

How to Use BMI Calculator

Step 1

Choose between Metric (kg/cm) or Imperial (lbs/inches) units.

Step 2

Enter your height and weight.

Step 3

Your BMI and category appear instantly in real time.

Step 4

View your position on the visual BMI scale bar.

Features

Toggle between Metric and Imperial unit systems.

Real-time BMI calculation as you type.

Color-coded BMI categories: Underweight, Normal, Overweight, Obese.

Visual BMI scale bar showing your position.

Completely free with no sign-up required.

FAQ

: BMI (Body Mass Index) is a simple measure using your height and weight to estimate body fat. It is calculated as weight in kilograms divided by height in meters squared.
: Underweight is below 18.5, Normal weight is 18.5 to 24.9, Overweight is 25 to 29.9, and Obese is 30 or above.
: BMI is a useful screening tool but does not directly measure body fat. It may not be accurate for athletes, elderly individuals, or people with high muscle mass.
: No. All calculations happen locally in your browser. Your height and weight are never sent to any server.