BMI Calculator

Calculate Body Mass Index in imperial or metric units.

Weight (lbs):

Height (feet):

Height (inches):

About BMI Calculator

Body Mass Index (BMI) calculator utilizing Quetelet Index standards (kg/m²) with WHO adult classification categories, metric and imperial conversions, and healthy weight range estimations.

Key features

Exact biometric calculation supporting metric (centimeters/kilograms) and imperial (feet, inches, pounds).
World Health Organization (WHO) weight stratification from severe thinness to Class III obesity.
Automatic dynamic calculation of ideal body mass ranges based on target 18.5 - 24.9 BMI thresholds.
Zero server transmission with private, client-side mathematical evaluation.

How to use

Select Measurement Units: Choose between Imperial (lbs, ft, in) and Metric (kg, cm) systems.
Enter Height and Weight: Input your body weight and standing height into the numeric fields.
Review BMI & Healthy Range: Inspect your calculated score, classification category, and copy the summary.

FAQ

What is the mathematical formula for Body Mass Index?

The Quetelet formula is weight in kilograms divided by height in meters squared: BMI = weight (kg) / [height (m)]².

Does BMI distinguish between muscle mass and body fat?

BMI is a population screening metric that does not directly measure adipose tissue; muscular athletes may record higher BMI values without elevated adiposity.

What are the WHO BMI thresholds?

Underweight is below 18.5, Normal weight is 18.5–24.9, Overweight is 25.0–29.9, and Obese is 30.0 or greater.

Is my personal biometric data stored or sent anywhere?

No, all calculations are executed entirely in your local browser runtime.

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