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BMI (Body Mass Index) calculator

Calculate your body mass index from your weight and height, with the corresponding WHO category.

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BMI

24.2

Category: Normal weight

This calculator is for informational and educational purposes only; it does not provide a medical diagnosis and does not replace assessment by a healthcare professional.

Calculate your Body Mass Index (BMI) from your weight and height, and instantly see which WHO category it falls into.

Divides your weight in kilograms by the square of your height in meters (BMI = weight / height²) and compares the result against the standard WHO ranges: underweight below 18.5, normal weight from 18.5 to 24.9, overweight from 25 to 29.9, and obesity at 30 or above.

Use cases

  • Tracking your weight relative to your height over time as a rough gauge.
  • Quickly checking which WHO category your current weight falls into.
  • Preparing numbers ahead of a medical or nutrition appointment.

How it works

  1. 1

    Enter your weight

    Type your weight in kilograms.

  2. 2

    Enter your height

    Type your height in centimeters.

  3. 3

    Read your BMI and category

    The result and category (underweight, normal, overweight or obesity) update instantly.

Technical details

Applies the Body Mass Index (Quetelet) formula, BMI = mass (kg) / height (m)², using the international cutoff points from the World Health Organization rather than any country-specific scale.

Frequently asked questions

Is BMI an exact measure of body fat?

No. It's a simple screening tool — it doesn't distinguish muscle mass from fat mass and doesn't account for bone density, age or sex, so it can over- or underestimate actual body fat in some people, such as heavily muscled athletes.

Are BMI categories the same for everyone?

This calculator uses the standard international WHO ranges. Some countries or populations apply slightly different cutoffs, and children and teens are assessed with age-specific percentile charts, not these adult categories.

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