Anorexic BMI Calculator
Understand BMI ranges associated with underweight and anorexia, with health risk information.
The Anorexic BMI Calculator measures Body Mass Index with special focus on underweight classifications. It helps identify individuals at potential risk of severe malnutrition or eating disorders by providing detailed underweight categorization.
Examples
5'5", 100 lbs
Frequently Asked Questions
What BMI is considered anorexic?
Is this calculator a diagnostic tool?
Quick Tips
- •Use this calculator as a conversation starter with healthcare providers, not for self-diagnosis.
- •Track BMI trends over time rather than focusing on a single result; rapid weight changes warrant medical attention.
- •If concerned about eating disorders, seek professional help from a therapist or doctor specializing in mental health.
- •Remember that recovery from disordered eating requires professional support; contact NEDA (1-800-931-2237) or Crisis Text Line (text HOME to 741741).
- •Healthy recovery involves medical, nutritional, and psychological care—BMI is just one small part of overall health assessment.
The Anorexic BMI Calculator measures Body Mass Index with special focus on underweight classifications. It helps identify individuals at potential risk of severe malnutrition or eating disorders by providing detailed underweight categorization.
How to Use This Calculator
Enter your weight and height. The calculator computes your BMI and provides a detailed underweight classification, showing where you fall within the underweight spectrum from mildly to very severely underweight, along with the healthy weight range for your height.
Understanding the Formula
BMI = Weight (kg) / Height (m)². Underweight classifications: Very severely underweight (< 15), Severely underweight (15-16), Moderately underweight (16-17), Mildly underweight (17-18.5), Normal (18.5-24.9).
Examples
5'5", 100 lbs
Weight: 45.4 kg, Height: 1.65 m. BMI = 45.4 / (1.65)² = 16.7. Category: Moderately Underweight. Weight needed for healthy BMI: ~113 lbs.
Frequently Asked Questions
What BMI is considered anorexic?
While BMI alone does not diagnose anorexia nervosa (which is a complex psychiatric condition), a BMI below 17.5 is one of the diagnostic criteria used by healthcare professionals. A BMI below 15 is considered very severe.
Is this calculator a diagnostic tool?
No. This calculator provides BMI classification only. Eating disorders are complex conditions requiring professional diagnosis. If you or someone you know is struggling, please contact NEDA (1-800-931-2237) or a healthcare professional.
Assumptions & Limitations
- BMI does not account for muscle mass, bone density, or body composition—athletes may have high BMI despite low body fat.
- This calculator is a screening tool only and cannot diagnose eating disorders, which are complex psychiatric conditions.
- Age, sex, and genetic factors affect healthy weight ranges and are not fully captured by BMI alone.
- The calculator assumes accurate weight and height measurements; even small errors can affect results.
- Results apply to adults; children and adolescents have different healthy BMI ranges.