How to Use the InBody Result Interpretation Calculator
The Muscle-Fat Analysis graph on an InBody printout arranges three bars — weight, skeletal muscle mass, and body fat mass — against a 100% standard line, and the resulting shape is commonly described as C-shape, I-shape, or D-shape. This calculator takes your gender, skeletal muscle mass percentage (relative to standard), and body fat percentage, and tells you which shape you're closest to along with a short interpretation.
A C-shape means skeletal muscle mass falls below standard while body fat exceeds it — the so-called "skinny fat" pattern, which can carry metabolic risks that a scale alone won't reveal. A D-shape is the opposite: muscle mass above standard with body fat in the normal range, a more athletic build. An I-shape means both metrics sit close to standard — a balanced physique.
Body fat thresholds differ by gender. Generally, 20% or higher for men and 28% or higher for women is considered on the higher side, and this calculator weighs that threshold together with your muscle mass percentage to determine your shape. Two people at the same body weight can have very different health profiles depending on their muscle-to-fat ratio.
This result is a simplified reference based on the numbers from your InBody printout — for an accurate health assessment, review your full report with a trainer or healthcare professional. Keep in mind that body composition readings can also shift with hydration, recent meals, and whether you exercised before the scan.
Frequently Asked Questions
On the Muscle-Fat Analysis graph of your InBody printout, the skeletal muscle mass bar shows a percentage relative to the standard range (typically 90-110%). If the bar extends past the standard zone, it reads above 100%; if it falls short, it reads below 100%.
This pattern is often closer to 'skinny fat' — a mismatch between muscle and fat rather than a body weight problem. Instead of focusing purely on losing weight, building skeletal muscle mass through strength training while gradually reducing body fat is usually the better approach.