BMI Calculator (WHO Standards)
Calculate Body Mass Index (height, weight) with WHO boundaries. Fast, free, and fully client-side.
Calculator Inputs
Weight (lbs)
Height (inches)
BMI Score—
WHO Classification—
How the BMI Calculator (WHO Standards) Works
Body Mass Index (BMI) evaluates body weight relative to height, categorized according to World Health Organization (WHO) adult screening standards.
Formula
BMI = Weight (kg) / (Height (m))² or (Weight (lbs) × 703) / (Height (in))²
Standard screening metric used by medical practitioners to classify weight status.
Calculation Example
An individual weighing 70 kg with a height of 1.75 m has a BMI of 70 / (1.75)² = 22.86 (Normal weight).
Frequently Asked Questions
What are the official WHO BMI categories?
Underweight (<18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (≥30).
Does BMI distinguish between muscle and fat mass?
No, BMI is a general population screening tool and does not differentiate between lean muscle mass and adipose tissue.
Browse more
See all fitness tools.