Calculate daily calorie needs for indoor cats using RER × 1.2-1.4 sedentary factor. Keep your indoor cat at a healthy weight with precise feeding.
Indoor cats live longer, safer lives, but they face a unique challenge: limited physical activity. Without the exercise of hunting, climbing trees, and patrolling territory, indoor cats burn significantly fewer calories than their outdoor counterparts and are far more prone to obesity.
The Maintenance Energy Requirement for a sedentary indoor cat is calculated by multiplying the Resting Energy Requirement (RER) by a factor of 1.2 to 1.4. Most veterinarians use 1.2 for truly sedentary cats and 1.4 for indoor cats that still engage in regular play sessions and have enrichment activities.
This calculator helps you determine the precise calorie target for your indoor cat based on weight and activity within the home. Getting this number right is the single most important step in preventing indoor cat obesity, which affects an estimated 60% of indoor-only cats.
Responsible pet owners, breeders, and veterinary professionals benefit from accurate indoor cat calorie data when making care decisions, budgeting for expenses, or monitoring health benchmarks. Revisit this tool whenever your pet's needs, weight, or age changes to keep recommendations current.
Indoor cats are twice as likely to be overweight compared to outdoor cats. Free-feeding a cup of dry food (350+ kcal) to a 10-lb indoor cat that only needs 200 kcal is a recipe for obesity. This calculator gives you the exact calorie target so you can measure portions accurately.
RER = 70 × (weight in kg)^0.75 MER (sedentary indoor) = RER × 1.2 MER (active indoor) = RER × 1.4 1 lb = 0.4536 kg
Result: 228 kcal/day
Weight = 4.54 kg. RER = 70 × 4.54^0.75 = 190 kcal. For a sedentary indoor cat: MER = 190 × 1.2 = 228 kcal/day. This equals about 2/3 cup of typical dry food or 1.5 standard 5.5 oz cans of wet food.
Studies show that 59% of cats in the U.S. are classified as overweight or obese, with indoor-only cats disproportionately affected. Contributing factors include unlimited dry food access, lack of exercise, boredom eating, and owners underestimating portion sizes.
Cat trees, window perches, rotating toy collections, and food puzzles all increase an indoor cat's daily energy expenditure. Studies show that environmental enrichment can increase activity levels by 20-30%, which translates to measurably better weight outcomes.
If your cat is used to free-feeding, transition gradually over 1-2 weeks. Start by putting the daily amount in the bowl and removing it after 30 minutes. Most cats adapt within a week and learn to eat at scheduled mealtimes.
Indoor cats typically sleep 16-20 hours a day and cover a fraction of the territory an outdoor cat would. This dramatically reduces their energy expenditure, meaning they need 20-40% fewer calories than active outdoor cats.
Use 1.2 if your cat is mostly sedentary — sleeping, lounging, minimal play. Use 1.4 if you actively play with your cat daily and they have enrichment activities. Most apartment cats fall closer to 1.2.
Free-feeding is not recommended for indoor cats. The vast majority will overeat when food is always available. Measured meals twice daily are the best approach for weight management.
Feel your cat's ribs — you should be able to detect them with light pressure. Look from above for a visible waist. From the side, the belly should tuck up slightly. If ribs are hard to feel or the belly sags, your cat is likely overweight.
If your cat needs to lose weight, a veterinary weight management diet is lower in calories and higher in fiber and protein. However, portion control with regular food is equally effective for mild overweight cases.
Aim for 20-30 minutes of interactive play daily, split into 2-3 sessions. Wand toys, laser pointers, and puzzle feeders are excellent options. Even moderate play can move a cat from a 1.2 to a 1.4 activity factor.