BMI WHO Classification

Classify BMI by WHO categories: <18.5 underweight, 18.5-24.9 normal, 25-29.9 overweight, 30-34.9 obese class I, 35-39.9 obese class II, 40+ obese class III. Asian cutoffs: overweight 23+.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
Advertisement

How to Use

Enter the values for the scenario you are assessing. Classify BMI by WHO categories: <18.5 underweight, 18.5-24.9 normal, 25-29.9 overweight, 30-34.9 obese class I, 35-39.9 obese class II, 40+ obese class III. Asian cutoffs: overweight 23+. Use the bmi classification result to inform your calculation.

Related Calculators

Metabolic Syndrome

Medical

FINDRISC Score

Medical

HOMA-IR

Medical

Frequently Asked Questions