Enter your cat's Rib Cage Circumference, Leg Length, Current Weight, Age Group, and Spay/Neuter Status to calculate their Feline BMI Score — plus a Weight Status, Ideal Weight Range, and exactly how much Weight Difference stands between your cat and their healthiest self.
Feline BMI Score
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Weight Status
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Ideal Weight Range (Min)
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Ideal Weight Range (Max)
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Weight Difference
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You need two measurements: rib cage circumference (around the widest part of your cat's chest) and leg length (from shoulder to paw on the front leg). Use a flexible measuring tape and ensure your cat is standing naturally.
FBMI scores typically range from underweight (below 15) to overweight (above 30). An ideal FBMI is usually between 15-25, but this can vary based on breed and individual cat characteristics.
Consult your veterinarian first, then reduce portion sizes, switch to weight management food, increase playtime and exercise, and avoid free-feeding. Weight loss should be gradual - about 1-2% of body weight per week.
No, weight alone isn't sufficient. A healthy cat weight depends on breed, age, sex, and body frame. BMI calculations and body condition scoring provide a more accurate assessment than weight alone.
Monitor your cat's BMI monthly if they're at ideal weight, or weekly if they're on a weight management program. Regular monitoring helps catch weight changes early.
Breed, age, sex, spay/neuter status, activity level, and individual body frame all influence ideal weight. Spayed/neutered cats typically need fewer calories and may weigh slightly more.
Yes, indoor cats are typically less active and may need 10-20% fewer calories than outdoor cats. They're also more prone to weight gain due to reduced exercise and increased food availability.