How Much to Feed a Cat: Vet-Backed Feeding Guide by Age, Weight & Diet Type

If you’ve been relying on your cat’s food packaging to tell you how much to feed them, you may have been doing your cat a disservice. While feeding guidelines can be a helpful starting point, cat nutrition isn’t one-size-fits-all. Finding the optimal cat diet depends on your cat’s age, weight, body condition, activity level, and whether they prefer wet or dry food.

This article uses veterinary guidance and the RER (Resting Energy Requirement) formula. This is the method vets use to help you figure out how much to feed a cat. We'll also go over food type, weight, and life stage, and how they affect how much your cat eats.

Here at Tuft & Paw, we’re cat experts. We’re intimately familiar with the cat food features that are important to cats and their parents. The information in this article is based on consultation with veterinarians, online research, and our own experience as cat parents.

How Much Food Does a Cat Need Per Day?

The best way to find your cat's daily calorie needs is the RER (Resting Energy Requirement) formula. This formula considers how metabolism changes with body weight. Using this method, the average healthy adult cat needs roughly 200 to 350 calories per day, depending on their weight, activity level, and whether they're spayed or neutered. Less active or indoor cats fall toward the lower end of this range, while active or intact cats need more. For example, a 12-pound indoor cat needs about 300 calories per day, whereas a 12-pound active cat might need closer to 350 calories. Kittens under 6 months of age need about two to three times the amount of calories as their adult counterparts to support rapid growth and development.

Factors That Affect How Much to Feed a Cat

Dr. Ruth Roberts, DVM, and creator of The Original CrockPet Diet, says that the guidelines listed on cat food packaging are essentially educated guesses about how many calories the average cat needs. While these guidelines can be a starting point, individual factors also need to be considered when determining the optimal cat diet.

• Age/life stage: Because kittens are growing quickly and have smaller stomachs, they benefit from calorie-dense food to fuel their growth. Senior cats may need fewer calories as their activity levels and metabolism slow down, or a high-protein cat food to maintain muscle mass.

• Weight and body condition score (BCS): Dr. Bethany Hsia, DVM, and cofounder of CodaPet, says that cat owners can approximate their cat’s body condition score by feeling for their ribs at home. If they’re difficult to feel under a layer of fat, the cat is likely overweight. Vets evaluate the BCS on a 1-to-9 scale, examining the ribs, lumbar vertebrae, and pelvic bones while observing the waist and abdomen. This guides their recommendation about how much food your cat needs.

• Activity level: More active cats burn more calories, so they need to eat more to make up for this. In general, outdoor cats are more active than indoor cats. However, most cats need about three 10- 15-minute exercise sessions per day. If your indoor cat spends more time than this engaging in play and zoomies, they may need more calories.

• Spay/neuter status: Sex hormones help to keep cats’ metabolism higher, so spaying or neutering your cat lowers their metabolism. This means that spayed and neutered cats need about 25-30% fewer calories than their intact counterparts. However, spaying and neutering can increase appetite, so it’s best to feed your cat based on their BCS rather than their appetite.

• Food type: Kibble is more calorie-dense than wet food, so cats on a wet food diet often need larger portions. If you’re feeding your cat a mixed food diet, calculate calorie and portion sizes for both foods to ensure you’re feeding the right amount.

• Health conditions: Some health conditions can impact your cat’s nutritional needs and appetite. For example, Dr. Hsia says that cats with hyperthyroidism have higher metabolic demands, whereas cats with chronic kidney disease may require specialized protein-restricted diets. 

Cat Feeding Chart by Age and Activity Level

Once you understand the factors affecting calorie needs, you can use the chart below as a starting point. 

 

Note: Values calculated using RER = 70 × (weight in kg)^0.75, multiplied by standard activity factors. Confirm the calorie density of your specific food (kcal/cup or kcal/can) on the label or manufacturer's website. 

How to Calculate Your Cat’s Calories Based on Weight

Using the resting energy requirement and maintenance energy requirement (MER) formulas is the best way to calculate your cat’s calories. Dr. Roberts points out that cat food packaging often uses a simple linear calculation, which overlooks the fact that metabolic rate doesn’t increase in a straight line with body weight. RER and MER consider this, factoring in your cat’s activity level and life stage with their weight.

1. Convert your cat’s weight to kilograms by using the formula: Weight in kilograms ÷ 2.2. For example, a cat weighing 10 pounds weighs 4.5 kilograms.

2. Calculating the RER. This is the amount of calories that your cat burns at baseline with no activity. The formula for this is: RER = 70 x (weight in kg)0.75. For a 4.5 kg cat, the RER would be 216.3 kcal.

3. Multiply the RER by the Maintenance Energy Requirement (MER) based on your cat’s activity level or life stage:

• Inactive, indoor, or neutered adult: RER × 1.2

• Active or intact adult: RER × 1.4

• Weight loss goal: RER × 0.8

• Kittens (up to 4 months): RER × 2.5 

For an active adult, a 10-pound cat would need 302.82 calories. If you’re math-adverse, the Merck Manual and the Association for Pet Obesity Prevention both offer free cat calorie calculators.

How to Convert Calories to Portion Size

After calculating your cat’s caloric needs, the next step is to determine portion size. 

1. Check the manufacturer’s label for the kilocalorie (kcal) content per cup, ounce, or gram. For example, Tuft & Paw Really Great Cat Food Chicken and Rabbit Stew contains about 138 kcal per 5.5-ounce package, or roughly 25 calories per ounce. 

2. Divide your cat’s daily recommended calories by the calorie content to get the total daily portion. For example, a cat needing 250 calories per day would need 10 ounces of Really Great Cat Food each day (250 calories ÷ 25 calories/ounce = 10 ounces).

3. Divide the total daily portion by the number of meals per day. For example, if you plan to feed this cat 2 meals per day, they would get 5 ounces per meal (10 ounces ÷ 2 meals = 5 ounces/meal).

How Much to Feed a Cat By Life Stage

Kittens have higher calorie requirements, while senior cats often need fewer calories as they age. With regards to weight loss for cats, calories should be decreased slowly to ensure gradual, sustainable weight loss.

Feeding Kittens

When it comes to feeding kittens, they need about 2 to 3 times the amount of calories as a healthy adult cat. This is because kittens are burning more calories as they grow and develop. Dr. Roberts recommends feeding them a high-quality, calorie-dense kitten food 3-4 times per day.

Feeding Senior Cats

“As cats enter their senior years, their metabolic rate slows, and their activity levels decrease,” says Dr. Hsia, which means their calorie needs drop and portion sizes should decrease as a result. Dr. Roberts also adds that some senior cats start losing muscle mass and actually need more high-quality protein to maintain lean body mass. She recommends a senior cat food that has at least 40-50% protein (dry matter basis) from high-quality sources.

Weight Loss for Cats: Feeding Tips

When it comes to weight loss for cats, a slow reduction in calories and better portion control work best. Your vet can help you develop a safe weight loss plan to target a goal of 1-2% weight loss per week. Dr. Hsia says that your vet will ask about the amount and type of food you feed, how often, and whether you’re feeding your cat table scraps. Feeding habits often to blame include free-feeding, which prevents cat owners from monitoring food intake, overestimating serving sizes, and excess treats or table food.

As your cat adjusts to their new diet, they may have some complaints about the smaller portion sizes. Feeding wet food or adding water or broth to dry food can help increase the volume and boost satiety. Puzzle and slow feeders can also slow your cat’s eating down so that they feel more satisfied. 

Cat Feeding Schedule: How Often Should Cats Eat?

Two meals per day is the standard recommendation for healthy adult cats. Because cats evolved to eat numerous small meals throughout the day, most cats prefer to eat at least twice per day. Vets also say that regular meals can help with weight maintenance, let you monitor appetite changes, and strengthen your bond with your cat. However, different stages may require different cat feeding schedules. Kittens and seniors may need to eat more often than adults.

Cat Feeding Schedule Basic Guidelines

• Kittens under 6 months: 3-4 meals per day

• Healthy adult cats: 2 meals per day (~12 hours apart)

• Senior cats: 2-3 meals per day (3 smaller meals per day can be easier on digestion)

Dry vs. Wet Cat Food: Does It Change How Much You Feed?

Yes, whether you choose dry vs. wet cat food significantly impacts how much you should feed your cat due to differences in calorie density and moisture content. Wet food is 70-80% water, which means that the volume of food is larger and can be more satiating for your cat. Dr. Roberts says that because dry food is calorie-dense, it’s easy to overfeed without realizing it. This is especially true when you’re free-feeding dry food, which can lead to obesity and chronic dehydration. No matter if you choose wet food, dry food, or both, it’s important to calculate calories and measure portions.

Signs Your Cat Is Eating Too Much or Too Little

Changes in your cat’s appearance and behavior can indicate they’re eating too much or too little. It’s recommended to weigh your cat once a month so that you’re aware of any changes in their weight. Calories can be adjusted by 10-20% if your cat isn’t eating the right amount.

Overfeeding Signs

• Difficulty feeling the ribs underneath a layer of fat

• Lack of a defined waistline

• Low-hanging belly

• Lack of mobility and lethargy (not jumping)

• Reduced grooming behaviors

Underfeeding Signs

• Prominent ribs, spine, or hip bones

• Loss of muscle mass

• Dull or brittle coat

• Low energy

• Excessive begging or food aggression

The Bottom Line: How Much Should I Feed My Cat?

There’s no universal answer for how much to feed a cat, but there is a reliable formula to follow. Weighing your cat, calculating their RER, and adjusting for their activity level and life stage is the best way to estimate how many calories your cat needs. Then, check their body condition every month or so and adjust their calories by 10-20% if needed. If there’s ever any doubt, contact your vet, who can help you create a personalized nutrition plan for your cat. While there may be a bit of extra calculation up front, once you know how many calories your cat needs, feeding them becomes much more routine.

Frequently Asked Questions About How Much to Feed Cats

How many calories does a cat need per day?

A healthy adult cat typically needs about 200 to 350 calories each day. This amount varies based on their weight, activity level, and whether they’re spayed or neutered. Less active or indoor cats fall toward the lower end of this range, while active or intact cats are on the higher end. Kittens need two to three times as many calories to support their rapid growth, while seniors may need less food as their activity levels and metabolisms slow down. 

How much wet food should I feed my cat each day?

Wet cat food usually has about 70-125 calories per 3 oz can. This means that a 10-pound indoor cat who needs about 250 calories per day might need roughly 2.5 cans of a 100-calorie food, or about 2 cans of a 125-calorie food. However, calorie content can vary greatly by brand, so it’s best to check the label. 

Do treats count towards my cat’s daily food intake?

Yes, treats count towards your cat’s daily food intake because they contain calories. To keep your cat’s diet balanced, it’s best to include any calories from treats in their overall daily calorie total. Vets usually recommend that treats make up no more than 10% of your cat’s daily calories.

How much should an indoor cat eat per day?

Indoor cats typically need their resting energy requirement (RER) multiplied by about 1.2, since they're usually less active than outdoor cats. For example, a 12-pound indoor cat needs about 300 calories per day. However, more active indoor cats may need more calories, up to 1.4 times their RER.

Is it okay to feed my cat once per day?

Yes, it is okay to feed an adult cat once per day, and some cats do well on this schedule. Ideally, twice a day is best because it is a predictable routine that lets you monitor your cat’s appetite and can help prevent weight gain. Kittens, senior cats, and cats with certain health issues often need to eat more often than twice per day.

Are homemade cat food recipes good for weight loss?

Homemade cat food recipes can be designed to support weight loss, but most vets don’t recommend them because they’re often not nutritionally complete. If you think your cat needs to lose weight, it’s best to work with your vet, who can create a personalized weight loss plan for your cat.

Sources

Cornell Feline Health Center. (2024). How often should you feed your cat? Cornell University College of Veterinary Medicine. https://www.vet.cornell.edu/departments/cornell-feline-health-center/health-information/feline-health-topics/how-often-should-you-feed-your-cat 

Grant, C., Llera, R., & Downing, R. (2024). Feeding times and frequency for your cat. VCA Animal Hospitals. https://vcahospitals.com/know-your-pet/feeding-times-and-frequency-for-cats 

Grant, C., Williams, K., & Ward, E. (2024). Following a weight loss plan for cats. VCA Canada Animal Hospitals. https://vcacanada.com/know-your-pet/creating-a-weight-reduction-plan-for-cats 

Ontario SPCA and Humane Society. (2023, December 5). Spayed, neutered, and thriving: Kitten nutrition essentials. https://ontariospca.ca/blog/spayed-neutered-and-thriving-kitten-nutrition-essentials 

Wilson, S. A., Villaverde, C., Fascetti, A. J., & Larsen, J. A. (2019). Evaluation of the nutritional adequacy of recipes for home-prepared maintenance diets for cats. Journal of the American Veterinary Medical Association, 254(10), 1172–1179. https://doi.org/10.2460/javma.254.10.1172 

Quimby, J., Gowland, S., Carney, H. C., DePorter, T., Plummer, P., & Westropp, J. (2021). 2021 AAHA/AAFP feline life stage guidelines. Journal of the American Animal Hospital Association, 57(2), 51–72. https://doi.org/10.5326/JAAHA-MS-7189