What units can I use?

You can enter weight in kg or lb and height in m, cm, inches, or feet and inches. The result is always shown in kg/m².

What do the BMI ranges mean?

BMI is grouped into underweight (below 18.5), normal (18.5–24.9), overweight (25–29.9), and obese (30+). These are general guides only; a healthcare provider can interpret your result.

BMI Calculator

Calculate body mass index from weight and height. Supports kg/lb and m/cm/in/ft+in.

What this calculator does

This tool estimates your body mass index (BMI): a number that relates your weight to your height. It is often used as a simple screening measure, not a diagnosis of health or body fat.

What your result means

BMI is grouped into ranges (e.g. underweight, normal, overweight, obese). These ranges are only general guides; they do not account for muscle, age, or health. A healthcare provider can help you interpret your result.

This is not medical advice. A healthcare provider should interpret results in your context.

Weight (kg)

Height (cm)

Key terms

BMI: Body mass index; a number (weight ÷ height²) used as a screening tool for weight category.
kg/m²: Kilograms per square metre; the unit in which BMI is expressed.
Underweight: BMI below 18.5 (general guideline).
Normal weight: BMI between 18.5 and 24.9 (general guideline).
Overweight: BMI between 25 and 29.9 (general guideline).
Obese: BMI of 30 or above (general guideline).

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This tool is for educational and reference use only. It does not constitute medical advice. Always consult a healthcare professional for medical decisions.