Awareness

Anorexic BMI Calculator

Estimate BMI and compare it with clinical thresholds often used when screening for anorexia nervosa. BMI alone cannot diagnose an eating disorder—always consult licensed medical and mental health professionals.

Result

20.76

BMI (kg/m²)

Normal range

BMI ≥ 18.5 is typically not suggestive of anorexia nervosa.

BMI is only one screening metric. Diagnosis of anorexia nervosa requires clinical interviews, laboratory tests, and mental health evaluation.

BMI thresholds

Severity specifiers based on DSM-5 and WHO interpretations.

Category	BMI range	Notes
Normal range	≥ 18.5	BMI ≥ 18.5 is typically not suggestive of anorexia nervosa.
Low weight / monitor	17.5 - 18.49	BMI slightly below 18.5. Monitor nutrition status and behavior changes.
Mild anorexia	16 - 17.49	Meets mild BMI criterion under DSM-5; clinical assessment recommended.
Moderate anorexia	15 - 15.99	BMI 15-15.99. Risk of organ strain; urgent medical evaluation advised.
Severe / extreme anorexia	0 - 14.99	BMI < 15 is life-threatening. Seek immediate medical care.

About anorexia nervosa

Anorexia is a mental health disorder characterized by distorted body image, intense fear of gaining weight, and restrictive behaviors. It often appears with anxiety, depression, OCD traits, or trauma history. Warning signs include dramatic weight loss, obsession with calories, ritualized eating, excessive exercise, or social withdrawal.

Medical exams may involve BMI, lab panels, bone density tests, vital signs, and mental health interviews. Early treatment improves outcomes and typically combines psychotherapy (CBT-E, family-based therapy), medical monitoring, and nutrition rehabilitation.

When to seek urgent care

BMI below 15 or rapid weight loss (>1 kg/week) with fatigue or dizziness.
Signs of dehydration, fainting, chest pain, or abnormal heart rate.
Self-harm thoughts, suicidal ideation, or severe anxiety around food.
Electrolyte abnormalities, lanugo hair growth, cold intolerance.

Support resources

NEDA Helpline (US) — confidential chat, call, or text support
Contact primary care physicians, registered dietitians, or licensed therapists specialized in eating disorders.
Emergency services (911 or local) for life-threatening symptoms or thoughts.

This calculator is informational and should not replace professional medical advice or diagnosis.