BMI ≥ 40 kg/m²
Defined as severe (morbid) obesity; bariatric surgery may be evaluated clinically without the requirement of an accompanying disease.
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Body Mass Index is one of the core clinical indicators for obesity and metabolic surgery decisions. On this page you can compute your BMI and review WHO categories alongside the eligibility thresholds defined by international guidelines (IFSO, ASMBS).
Enter your height and weight to see your BMI instantly. Discover the clinically accepted range for bariatric and metabolic surgery.
Category guide
Your BMI
Bariatric surgery is not indicated; lifestyle adjustment and clinical follow-up are recommended.
BMI ranges defined by the World Health Organization (WHO) and their meaning in the context of bariatric surgery.
| Category | BMI Range | Clinical Meaning |
|---|---|---|
| Underweight | < 18,5 | Underweight — nutrition and underlying causes should be evaluated. |
| Normal | 18,5 – 24,9 | Healthy weight range — bariatric surgery is not indicated. |
| Overweight | 25 – 29,9 | Overweight — lifestyle adjustment and clinical follow-up are recommended. |
| Obesity — Class I | 30 – 34,9 | Obesity Class I — surgery may be considered if metabolic comorbidities are present. |
| Obesity — Class II | 35 – 39,9 | Obesity Class II — clinically accepted range for bariatric surgery with comorbidities. |
| Severe Obesity | ≥ 40 | Severe obesity — clinically accepted range for bariatric surgery. |
BMI alone does not determine surgical eligibility; it is evaluated together with the following clinical criteria.
Defined as severe (morbid) obesity; bariatric surgery may be evaluated clinically without the requirement of an accompanying disease.
Surgery may be considered when at least one obesity-related comorbidity such as type 2 diabetes, hypertension, sleep apnea, dyslipidemia or fatty liver disease is present.
Per the 2022 ASMBS/IFSO update, metabolic surgery may be considered in selected patients with type 2 diabetes uncontrolled despite medical therapy.
Patients aged 18-65 are typically preferred, though age alone is not an exclusion. Operative eligibility is determined after anesthesiology and surgical risk assessment.
For detailed information about bariatric and metabolic surgery procedures, you may use the contact channels below. Initial consultations for international patients can be arranged remotely via video call or WhatsApp.
Assoc. Prof. Dr. Hacı Hasan Abuoğlu
Associate Professor of General Surgery