BMI Calculator
Your Body Mass Index from height and weight — in kilograms and centimetres, or feet, inches and pounds.
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BMI is a general screening guide for adults, not a medical diagnosis. It can misread muscular builds, and it does not apply to children or during pregnancy. For health decisions, see a qualified professional.
How to use it
Choose your units — metric or imperial.
Enter height and weight.
Get your BMI, its category, and the healthy weight range for your height.
How BMI works
BMI is your weight in kilograms divided by your height in metres, squared. Doctors use it as a first screening step because it correlates with body-fat risk across large populations. Its blind spots are real — a rugby player and a couch fan can share a BMI with very different health — so treat the number as a starting point for a conversation, not a verdict. We show your figure next to the healthy weight range for your height, which most people find more actionable than the index alone.