1. What is the Amputee BMI Equation?

The Amputee BMI Equation adjusts body mass index calculations to account for missing limb mass. Standard BMI calculations would underestimate obesity in amputees without this adjustment.

2. How Does the Calculator Work?

The calculator uses the Amputee BMI equation:

Where:

• \( W \) — Current weight (kg)
• \( P \) — Percentage of body weight amputated (decimal)
• \( H \) — Height (meters)

Explanation: The equation first adjusts the weight by dividing by (1 - percentage lost), then calculates BMI normally with the adjusted weight.

3. Importance of Adjusted BMI for Amputees

Details: Accurate BMI assessment is crucial for amputees as standard BMI would classify them as underweight when they may actually have normal or excess body fat percentage.

4. Using the Calculator

Tips: Enter current weight in kg, height in meters, and the percentage of body weight lost to amputation as a decimal (e.g., 0.20 for 20%). Use standard percentage values for common amputations if unknown.

5. Frequently Asked Questions (FAQ)

Q1: What are standard percentage values for common amputations?
A: Hand (0.7%), Below elbow (2.3%), Above elbow (3.0%), Foot (1.5%), Below knee (5.9%), Above knee (8.5%).

Q2: Why is BMI adjustment important for amputees?
A: Standard BMI would underestimate body fat percentage in amputees, potentially missing obesity-related health risks.

Q3: How accurate is this adjustment?
A: It provides a reasonable estimate but may not account for individual variations in body composition.

Q4: Should this be used for bilateral amputees?
A: Yes, but the percentages should be combined (e.g., two below-knee amputations would be 11.8%).

Q5: Are there other methods to assess body composition in amputees?
A: More accurate methods include skinfold measurements, bioelectrical impedance analysis, or DEXA scans when available.