BMI Calculator : Calculate your BMI and evaluate underweight severity based on clinical WHO and DSM-5 criteria. Free educational BMI assessment tool at DigitalCalculator.co.in.”>
Underweight BMI Calculator
Calculate your Body Mass Index (BMI) and evaluate underweight severity based on official WHO classifications and DSM-5 clinical criteria.
Body Metrics
Your Current BMI
16.5
kg/m²Clinical Classification
Understanding BMI and Underweight Severity
This clinical calculator uses the Body Mass Index (BMI) to help identify potential malnutrition, eating disorders, or other medical conditions causing severe weight loss. It utilizes standard classifications from the World Health Organization (WHO) and the DSM-5.
WHO Underweight Categories
The World Health Organization strictly categorizes adults with a BMI below 18.5 as underweight. The severity of thinness is broken down further to assist medical professionals in identifying malnutrition:
- Severe Thinness: BMI < 16.0
- Moderate Thinness: BMI 16.0 - 16.99
- Mild Thinness: BMI 17.0 - 18.49
- Normal Range: BMI 18.5 - 24.9
Anorexia Nervosa DSM-5 Criteria
The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) uses BMI as a clinical marker to specify the current severity of Anorexia Nervosa in adults. A low BMI is just one diagnostic criterion, accompanied by an intense fear of gaining weight and a distorted body image:
- Extreme: BMI < 15.0
- Severe: BMI 15.0 - 15.99
- Moderate: BMI 16.0 - 16.99
- Mild: BMI ≥ 17.0
Seek Help and Support
If you or someone you know is struggling with an eating disorder, extreme weight loss, or distorted body image, professional help is available and recovery is possible.
In the US: Contact the National Alliance for Eating Disorders helpline at 1-866-662-1235.
In the UK: Contact Beat Eating Disorders at 0808 801 0677.
Globally: Please reach out to your local healthcare provider or emergency services immediately.