RER = 70 × (weight in kg)^0.75
A cat's daily energy need starts with the Resting Energy Requirement: RER = 70 × (body weight in kg)^0.75. The Maintenance Energy Requirement (MER) multiplies RER by a factor: neutered adult ×1.2, intact ×1.4, kitten ×2.5, weight loss ×1.0 (RER only). A typical 10-lb neutered indoor cat needs about 200-250 kcal/day. Cats are obligate carnivores requiring high protein (>30% of calories), moderate fat, and minimal carbohydrates. Feeding guidelines on pet food labels are starting points — adjust based on body condition. Overfeeding is the #1 cause of feline obesity. Use measured portions, limit treats to <10% of calories, and weigh your cat monthly.