BMI Calculator — FAQ

Enter your height and weight in either metric or imperial units and the tool instantly calculates your body mass index and shows which standard weight category it falls into — no button refresh needed.

Yes, it's completely free with no sign-up, downloads, or limits. Use it as often as you like.

Body mass index (BMI) is a number calculated from your height and weight that's used as a quick, general screening measure to categorise weight ranges in adults.

BMI is your weight in kilograms divided by the square of your height in metres (kg/m²). The calculator handles the conversion automatically whether you enter metric or imperial values.

This tool uses the standard World Health Organization adult ranges: underweight (BMI below 18.5), healthy weight (18.5 to 24.9), overweight (25 to 29.9), and obese (30 and above). The tool shows which band your result falls into.

Yes. You can switch between metric (cm, kg) and imperial (ft/in, lb) units, and the result updates instantly.

Yes. Alongside your BMI, it shows the weight range generally considered healthy for your specific height — the minimum weight at BMI 18.5 and the maximum at BMI 25.

BMI is a useful quick screening tool, but it has limits — it doesn't distinguish muscle from fat or account for age, sex, ethnicity, or body composition. It's a general indicator, not a diagnosis.

No. Your height and weight are processed directly in your browser and are never stored or sent to a server, keeping your information completely private.

No — BMI is just one general indicator. For personalised advice about your weight or health, speak to a doctor or qualified health professional rather than relying on a single number.