Cat Calorie Calculator

Usually toward the lower end of WSAVA's range. WSAVA's own "obese-prone adult" formula (130 kcal × weight in kg^0.4) is the one typically applied to a neutered, mostly indoor cat, since indoor life and neutering both tend to lower activity and energy use. Pick "Typical / indoor" and "Yes" for neutered above to see that formula applied to your cat's own weight.

WSAVA's 2011 Nutritional Assessment Guidelines list neuter status as one of the recognized factors behind a cat's maintenance energy need, alongside body condition, life stage, and activity. There's no single published percentage for exactly how much neutering lowers it, which is why the calculator above picks between WSAVA's two published adult formulas rather than inventing one number to multiply by.

Select "Lose weight" above and the calculator uses the lower of WSAVA's two published adult formulas as a starting point. Cats need to lose weight slowly and under a vet's supervision — losing weight too fast can trigger a serious liver condition called hepatic lipidosis — so treat this number as something to bring to that conversation, not a diet to start alone.

It's a starting point, not a guarantee. WSAVA states plainly that energy requirements "can vary by 50% in either direction for cats" even among healthy animals of the same weight — genetics, breed, and individual metabolism all move the real number. That's why the result above always shows a published range next to the single estimate, and why body condition and weight trend over time matter more than any one calculator result.