BMI Calculator

Calculate your Body Mass Index and find your WHO category.

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Formula: BMI = kg / m² BMI = (lbs × 703) / in²
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10 18.5 25 30 35 40 50+
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What Is BMI?

The Body Mass Index (BMI) is a metric that describes the ratio of body weight to height. It is calculated by dividing weight in kilograms by height in meters squared. BMI serves as a rough guide to assess whether a person is underweight, normal weight, or overweight, and is used by the World Health Organization (WHO) as a standard indicator.

BMI Categories (WHO)

  • Below 18.5 — Underweight: May indicate malnutrition or illness.
  • 18.5 – 24.9 — Normal weight: Ideal range with lowest health risk.
  • 25.0 – 29.9 — Overweight: Increased risk of cardiovascular disease.
  • 30.0 – 34.9 — Obese Class I: Significantly increased health risk.
  • 35.0 – 39.9 — Obese Class II: High health risk.
  • 40 and above — Obese Class III: Very high health risk (morbid obesity).

Limitations of BMI

BMI does not distinguish between muscle and fat mass. Athletes with high muscle mass may have a high BMI while being healthy. Similarly, BMI does not account for age, sex, body frame or fat distribution. It should therefore be considered a starting point — for a comprehensive assessment, medical consultation is recommended.