Free Cat Calorie Intake calculator with clear step-by-step results.
Feline energy needs scale with metabolic body weight rather than weight itself, so the resting requirement uses the standard 70 x kg^0.75 relationship. A life-stage factor turns that into a maintenance requirement, and the food's energy density converts it into grams you can actually weigh.
Resting energy requirement
RER = 70 x (body weight kg)^0.75
Daily requirement
Daily kcal = RER x life-stage factor
General guidance only. Energy needs vary with breed, health status, medication and pregnancy. Discuss any feeding change - especially weight loss - with your veterinarian.
Cup markings on kibble vary by more than 20% with kibble size and settling. Cats maintain on 200-300 kcal a day, so that error is the difference between stable and obese.
Not without veterinary supervision. Cats are prone to hepatic lipidosis when calories are cut sharply, so weight loss should be slow and monitored.