Body Mass Index (BMI) is a simple measure that estimates whether a person’s weight is appropriate for their height.
Formula:
BMI Categories (Adults):
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5–24.9 | Healthy weight |
| 25.0–29.9 | Overweight |
| 30.0 and above | Obesity |
Example:
BMI = 70 ÷ (1.75 × 1.75) = 22.9, which is in the healthy weight range.
BMI is a useful screening tool, but it does not directly measure body fat or account for muscle mass, age, sex, or body composition.
If you tell me your height and weight, I can calculate your BMI and explain what it means.
Body mass index (BMI) is a person’s weight in kilograms divided by the square of height in meters.
BMI and weight category—
BMI is moderately correlated with measures of body fat.
BMI strongly correlated with various metabolic and disease outcomes.
A healthy weight for adults is between 18.5 and 24.9 kg/m2 (for all ethnicities except Asians, for whom the upper value of BMI is 21.8 kg/m2).
BMI of 25 kg/m2 or higher in adults.
Obesity is a BMI of 30 kg/m2 or higher in adults.
Adults with a BMI of 18.49 kg/m2 or less are considered underweight.
BMI = Weight (kg)/Height (m)²
World Health Organization (WHO) – Obesity and Overweight
https://www.who.int/news-room/fact-sheets/detail/obesity-and-overweightCenters for Disease Control and Prevention (CDC) – Adult BMI
https://www.cdc.gov/bmi/adult-calculator/National Heart, Lung, and Blood Institute (NHLBI) – BMI
https://www.nhlbi.nih.gov/health/educational/lose_wt/BMI/bmicalc.htmAmerican Heart Association – Healthy Weight
https://www.heart.org/National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
https://www.niddk.nih.gov/
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