BMI Calculator
Use our free BMI calculator to find out your Body Mass Index. Simply enter your height and weight in metric (cm/kg) or imperial (ft/lbs) units. BMI is a widely used screening tool to identify whether a person is underweight, normal weight, overweight, or obese.
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a value derived from a person's weight and height. It is calculated as weight (kg) divided by height squared (m²). BMI is used as a screening tool to categorise weight status.
What are the BMI categories?
The standard BMI categories are: Underweight (BMI below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above).
Is BMI an accurate measure of health?
BMI is a useful screening tool but not a direct measure of body fat or health. It does not account for muscle mass, bone density, age, or fat distribution. Athletes, for example, may have a high BMI due to muscle rather than fat.
What is the difference between metric and imperial BMI?
The metric formula is BMI = weight (kg) ÷ height² (m²). The imperial formula is BMI = 703 × weight (lbs) ÷ height² (inches²). Both give the same result.