Find out where your weight sits — in about 30 seconds.
Enter your height and weight below. We’ll calculate your BMI instantly and tell you what it means — honestly, without the judgment. Metric and imperial both work.
Use our BMI Calculator below
Body Mass Index isn’t perfect — and we’ll get to that — but it’s a useful starting point for understanding where your weight sits relative to your height. Enter your details below for an instant result.
What is BMI?
Body Mass Index is a simple calculation using your height and weight. It was developed in the 1830s by Belgian mathematician Adolphe Quetelet — not a doctor — which tells you something about its limitations.
What BMI doesn’t tell you
BMI doesn’t distinguish between muscle and fat, doesn’t account for age, sex, or ethnicity, and can misclassify athletes as overweight. Think of it as one data point, not a verdict.
Why it’s still useful
Despite its flaws, BMI remains a widely used screening tool because it’s fast, free, and gives a rough indication of weight-related health risk at a population level.
What to do with your result
If your BMI puts you in an unexpected category, talk to your GP before making any major changes. A number alone isn’t a diagnosis — it’s a starting point for a conversation.
This calculator is for informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. If you have concerns about your weight or health, please speak with a qualified healthcare professional.