Amputee BMI Calculator

The Amputee BMI Calculator estimates Amputee-Adjusted Body Mass Index using your height, weight, and amputation levels. This tool helps amputees and clinicians correct for missing limb mass to assess true cardiometabolic risk. Whether you are monitoring rehabilitation progress or screening for health issues, this calculator provides a reliable weight status metric tailored to limb loss.

Enter your height in centimeters or feet
Enter your current body weight

How Adjusted BMI Is Calculated

Amputee-Adjusted Body Mass Index represents your weight status if you still had your missing limbs. Standard BMI calculations often underestimate health risks because they use the lower, post-amputation weight. To fix this, the tool first converts your measurements to metric units for precision. Next, it applies a standard percentage for your missing limb to estimate how much weight was lost. By adding this estimated weight back, it calculates a true "adjusted" body weight. This final adjusted weight is divided by your height squared. This ensures you get a realistic risk assessment that accounts for your unique anatomy.

Adjusted Weight = Current Weight + (Current Weight × Sum of Missing Limb Percentages)

Where:

  • The missing limb percentage is a fixed value based on standard anthropometric data (e.g., 16% for an entire leg).
  1. Convert height to meters and weight to kilograms.
  2. Calculate the total percentage of missing body weight (P) based on selected amputation levels.
  3. Compute adjusted weight using the formula above.
  4. Divide the adjusted weight by height in meters squared to find the Adjusted BMI.

What Your Adjusted BMI Means

Your adjusted BMI number helps screen for health risks like heart disease or diabetes by correcting for the weight loss from amputation. This result provides a more accurate baseline than standard BMI to evaluate your cardiometabolic health.

Underweight (Below 18.5)

A score here suggests potential malnutrition, which can slow wound healing. Focus on nutrient-dense foods to support recovery and strength.

Normal Weight (18.5 to 24.9)

This range indicates a healthy status, suggesting your current weight supports good metabolic health and rehabilitation potential.

Overweight (25.0 to 29.9)

Falling in this range means you may face increased health risks. Consider moderate diet and exercise adjustments to protect your heart health.

Obese (30.0 or higher)

A result in this category signals high cardiometabolic risk. It often indicates a need for a structured clinical plan to manage long-term health.

Important: Muscle mass can affect these numbers, so active individuals might not fit neatly into these categories. This tool is for informational purposes only and is not a substitute for professional medical advice. Always consult a healthcare provider for a complete health assessment.

Monitor your adjusted BMI regularly to track changes during rehabilitation rather than relying on a single reading.