kg
⚕️ For clinical reference only. Not a substitute for professional judgment.
BMI Body Mass Index
Body mass index with WHO classification. Bariatric surgery threshold (BMI ≥40, or ≥35 with comorbidities) shown automatically.
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Enter values
Awaiting weight and height.
Units
Metric
cm
WHO Classification
<18.5 = Underweight
18.5–24.9 = Normal
25.0–29.9 = Overweight
30.0–34.9 = Obese Class I
35.0–39.9 = Obese Class II
≥40.0 = Obese Class III (morbid)
Bariatric surgery: ≥40, or ≥35 + comorbidities
18.5–24.9 = Normal
25.0–29.9 = Overweight
30.0–34.9 = Obese Class I
35.0–39.9 = Obese Class II
≥40.0 = Obese Class III (morbid)
Bariatric surgery: ≥40, or ≥35 + comorbidities
References
- WHO Expert Consultation. Lancet. 2004.
- NICE CG189 — Obesity: identification, assessment and management. 2014 (updated 2023).
- BOMSS Guidelines — Bariatric surgery. 2022.