How to Use the Cat BMI Calculator
Calculate feline body mass index and body fat percentage:
STEP 01
Measure Ribcage
Measure ribcage circumference at the 9th rib in centimeters.
STEP 02
Measure Lower Leg
Measure lower leg length (LIM) from knee joint to hock in centimeters.
STEP 03
Calculate FBMI
Engine applies scientific FBMI feline body fat equation.
STEP 04
Inspect Status
Review weight status classification (Underweight, Ideal, Overweight, or Obese).
Key Features & Feline Health
FBMI Anatomical Formula
Uses validated ribcage-to-leg ratio for accurate feline body fat estimation.
Diabetes & Arthritis Prevention
Helps prevent feline diabetes mellitus and joint pain.
100% Private Client Compute
Runs in browser memory with zero tracking or server logs.
Feline Health Guide: Body Mass Index & Obesity Management
Feline Body Mass Index (FBMI) provides an objective measure of feline body fat percentage. Obesity in cats increases the risk of hepatic lipidosis, diabetes, and shortened lifespan.
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Frequently Asked Questions
?What is a normal FBMI score for a domestic cat?
A normal, healthy FBMI score ranges between 15 and 29.