Health & Fitness

BMI Calculator

Enter your height and weight in metric or imperial units to see your body mass index and the standard BMI range it falls in.

Health & fitness

Body mass index

Live result

UnitsHeight (cm)Weight (kg)

Informational only — not medical advice

BMI is a rough screening number, not a diagnosis. It ignores muscle mass, body composition, age and many other factors. Talk to a qualified healthcare professional about your health. Your measurements stay in your browser.

What BMI can and cannot tell you

Body mass index compares weight to height across a population. It is useful for spotting broad trends, but two people with the same BMI can have very different body compositions. Use it alongside other measures rather than on its own.

Good to know

Frequently asked questions

How is BMI calculated?

BMI is weight in kilograms divided by height in metres squared. Imperial entries are converted to metric first, so both unit systems give the same result.

Is BMI accurate for everyone?

No. BMI does not distinguish muscle from fat and is less meaningful for athletes, children, pregnant people and older adults. Treat it as a rough screening number only.

Is this medical advice?

No. This tool is informational only and does not diagnose or treat anything. Speak to a qualified healthcare professional about your health.

Is my data stored?

No. Your height and weight stay in the browser tab and are never uploaded.

Body mass index

What BMI can and cannot tell you

Frequently asked questions

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