BMI Calculator

Healthy BMI Range: 18.5 – 24.9
Underweight <18.5 Normal weight 18.5–24.9 Overweight 25–29.9 Obese ≥30
FAQ
How is BMI calculated?

BMI (Body Mass Index) is calculated by dividing your weight in kilograms by the square of your height in metres: BMI = kg / m². For imperial units the equivalent formula is BMI = 703 × lb / in². The result is a dimensionless number used as a quick screening indicator of body weight relative to height.

What are the BMI categories?

The standard WHO BMI ranges are: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above). These are population-level screening thresholds, not a clinical diagnosis. BMI does not account for muscle mass, bone density, age, or sex. Always consult a healthcare professional for a complete health assessment.

About BMI Calculator
The BMI Calculator computes your Body Mass Index from height and weight in either metric (kilograms and centimetres) or imperial (pounds, feet, and inches) units. The result is displayed as a number with one decimal place, classified into the standard WHO weight category, and visualized on a colour-coded gradient bar so you can instantly see where you fall relative to the healthy range. All calculation is done locally — no data leaves your browser.