Anorexic BMI Calculator

Specialized BMI calculator for eating disorder assessment. This tool focuses on the very low BMI range and provides educational information about anorexia-related BMI categories.

Important: This calculator is for educational purposes only and is not a diagnostic tool. Always seek help from qualified healthcare professionals if you are concerned about an eating disorder.

Your Details

Range: 120-220 cm

kg

Range: 25-300 kg or 40-600 lbs

Enter your height and weight, then click Calculate to see your BMI assessment with detailed charts and guidance.

Complete User Guide

What is BMI?

Body Mass Index (BMI) is a measure calculated from your weight and height. It's used as a screening tool to identify potential weight-related health issues. The formula is:

BMI = Weight (kg) ÷ Height (m)²

While BMI is a useful screening tool, it doesn't directly measure body fat or account for muscle mass, bone density, or other factors. For very low BMI ranges, it's particularly important to consult healthcare professionals.

Anorexia-Related BMI Ranges

Severe Anorexia: BMI < 15

This indicates severe underweight status. Immediate medical attention is strongly recommended.

Anorexia: BMI 15-17.5

This range falls below the DSM-5 threshold for anorexia nervosa (BMI < 17.5). Professional evaluation is recommended.

Underweight: BMI 17.5-18.5

Below the normal weight range. Consider consulting a healthcare provider to ensure adequate nutrition.

Normal: BMI ≥ 18.5

Within the healthy weight range. Continue maintaining a balanced diet and regular physical activity.

How to Use This Calculator

  1. Select your preferred unit system (Metric or Imperial)
  2. Enter your current height accurately
  3. Enter your current weight
  4. Click 'Calculate BMI' to see your results
  5. Review the charts and detailed assessment
  6. Read the comprehensive guide below for interpretation

Understanding Your Results

BMI Value

Your calculated BMI number. Lower values indicate lower body weight relative to height.

Category & Severity

Shows which BMI range you fall into and the severity level. This helps identify if professional consultation is recommended.

Healthy Weight Minimum

The minimum weight (at BMI 18.5) considered healthy for your height. This is a target for gradual, supervised weight restoration if needed.

Weight to Gain

The difference between your current weight and the minimum healthy weight. This is informational only—weight restoration should always be supervised by healthcare professionals.

Understanding the Charts

BMI Gauge Chart

A circular gauge showing your BMI value visually. The color corresponds to your category (red for severe, orange for anorexia, yellow for underweight, green for normal).

BMI Categories Chart

A horizontal bar chart showing all BMI categories. Your current category is highlighted, making it easy to see where you fall on the spectrum.

Healthy Weight Range Chart

Shows your current weight compared to the healthy weight range for your height. Green bars indicate the healthy range, while your current weight is shown in a color matching your BMI category.

BMI Scale

A visual scale showing all BMI ranges with a marker indicating your current position. This provides a quick, at-a-glance understanding of your BMI status.

Important Notes

  • This calculator is for educational and informational purposes only. It is not a diagnostic tool.
  • BMI does not account for muscle mass, bone density, or body composition. Athletes or individuals with high muscle mass may have higher BMIs that don't reflect excess fat.
  • If you're concerned about an eating disorder or your weight, please seek help from qualified healthcare professionals, registered dietitians, or mental health providers.
  • Weight restoration, if needed, should be done gradually and under medical supervision to ensure proper nutrition and avoid refeeding syndrome.

When to Seek Professional Help

Consider consulting a healthcare professional if:

  • Your BMI is below 17.5 (anorexic range)
  • You're experiencing rapid weight loss
  • You have concerns about your eating patterns
  • You're experiencing physical symptoms like fatigue, dizziness, or irregular periods
  • You have persistent thoughts about food, weight, or body image that interfere with daily life

Additional Resources

If you or someone you know is struggling with an eating disorder, consider reaching out to:

  • • Your primary care physician or family doctor
  • • A registered dietitian specializing in eating disorders
  • • A mental health professional (psychologist, psychiatrist, or therapist)
  • • Eating disorder support organizations and helplines
  • • Emergency services if you're experiencing a medical emergency

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