Cat BMI Calculator (FBMI)
Calculate your cat's Feline Body Mass Index (FBMI) using rib cage and leg measurements to check their weight status.
Input Parameters
Enter details for calculation.
Feline BMI (FBMI)
Expert Tip
A healthy FBMI ranges between 15 and 30. Cats with a score above 30 are considered overweight and are at a significantly higher risk for feline diabetes.
Calculation Methodology & Details
Formula
Calculates the proportional body fat index of domestic felines using the rib cage circumference and lower leg length (limbs to torso ratio). Healthy range is 15 to 29.9.
Important Disclaimer
The provided calculations are for informational purposes and guidelines only. They do not replace professional veterinary advice or diagnosis.
How to Calculate Feline BMI (FBMI)
Measure and calculate your cat's body score with these steps:
Measure the Rib Cage
Wrap a soft tape measure around the cat's chest at the 9th rib.
Measure the Leg Length
Measure the leg from the knee (patella) to the heel bone (calcaneus) in cm.
Evaluate the FBMI Score
Score under 15 indicates underweight, 15-30 is ideal, and over 30 is overweight.