Cat BMI Calculator
Chemistry & BiologyCalculate a feline body mass index (FBMI) from rib cage circumference and leg length.
Feline BMI (FBMI)
Feline body mass index, a proportion-based measure independent of breed, age, or sex.
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Creators
Odeh Ahwal0people find this calculator helpful
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Helpful
Saved
Embeds
Chemistry & Biology calculators
Frequently Asked Questions
Why use rib cage and leg measurements instead of just weight?
Weight alone does not indicate whether a cat is overweight, since ideal weight varies by frame size. Rib cage circumference and leg length together capture body proportions in a way that works across different cat sizes without needing a breed selection.
Where exactly should rib cage circumference be measured?
Rib cage circumference should be measured around the body at the level of the 9th rib, roughly where the front legs meet the body, using a soft tape measure.
Is this formula breed-specific?
No, the feline BMI formula is designed as a universal measure that works regardless of breed, age, or sex, relying on body proportions rather than absolute size.
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