Calculator
Cat Food Calculator - Feeding Right Every Day
Cats have unique nutritional needs that differ from dogs. Our cat-specific RER formula gives you a sensible daily calorie estimate for every life stage.
CAT FOOD PORTION CALCULATOR
Feeding your cat just right.
Estimate your cat's daily energy needs using the Resting Energy Requirement formula adapted for feline life stages.
Save this to a pet's prep sheet after you create a cat profile.
✦~119 kcal per meal · ~34 g dry food per meal
Gentle reminder: Food energy density varies by brand. Cats are obligate carnivores - always use cat-specific food. Consult your vet before changing portions.
Feline nutrition basics
Why Cat Feeding Is Different
Cats are obligate carnivores, they need high protein and cannot thrive on plant-based foods. Their caloric needs vary significantly between indoor and outdoor lifestyles, and senior cats often need fewer calories but more easily digestible protein.
Protein first
Cats need animal-based protein as a primary energy source. Look for named meats as the first ingredient.
Hydration matters
Cats have a low thirst drive. Wet food can significantly boost daily water intake and kidney health.
Meal frequency
2–3 meals per day is ideal for most adult cats. Kittens may need 4 or more smaller meals.
Help & methodology
Common questions
Is the calorie result a prescription?
No. It is a starting estimate. A cat’s health, body condition, food, and activity can change actual needs.
Can I use the gram result for wet food?
Only when the entered energy density is expressed per 100 grams for that exact food. Otherwise use the package’s calories per can, pouch, or serving.
What if my cat gains or loses weight?
Unexpected weight change warrants veterinary advice. Do not make large feeding changes based only on this calculator.
Reference material: Merck Veterinary Manual energy table · WSAVA nutrition guidance