BMI Calculator

Calculate your Body Mass Index (BMI) to understand your weight category.

Calculate BMI

BMI thresholds used here apply to adults aged 18 and over.

About BMI

What is BMI?

Body Mass Index is a value derived from your weight and height. It gives a quick indication of whether your weight sits in a healthy range for your height, and is widely used as a first-pass screening measure.

How it is calculated

BMI is your weight in kilograms divided by the square of your height in metres.

Categories used on this page

BMI bands applied by this calculator
BMICategory
Below 16.5Severely Underweight
16.5 – 18.4Underweight
18.5 – 22.9Normal Weight
23.0 – 24.9Overweight
25.0 – 29.9Obesity Class I
30.0 and aboveObesity Class II

BMI is a screening measure, not a diagnosis. It does not distinguish muscle from fat. Discuss your result with a qualified practitioner.