How Much Should I Feed My Cat? Portions, Meals, Wet vs Dry

Choosing a main food: start with the AAFCO statement

A pet store aisle can hold a hundred cat foods. The most reliable way to tell whether one can be fed every day as the main diet is a small line on the bag called the nutritional adequacy statement. It says which nutrient standard the food meets. US foods follow AAFCO (the Association of American Feed Control Officials), and a food that meets the standard is “complete and balanced.”

On US bags the statement is usually on the back or side panel, in small print near the feeding guide.

Feeding trial vs. formulation

Both qualify. A feeding-trial food has had one more check.

Different ages, different foods

Prescription diets are a separate category, fed as your vet directs. The codes you see online, like c/d, k/d, m/d, or UR, NF, DM, are prescription diet product names. c/d and UR are for the urinary tract, k/d and NF for the kidneys, and m/d and DM for diabetes.

Toppers aren’t a main diet

Pouches and cans labeled “supplemental” or “intended for intermittent or supplemental feeding only” don’t meet the complete-and-balanced standard. They work as a treat or topper, and fed as the main diet they leave gaps in nutrition. A main-diet can says “complete and balanced” on the label. Fresh-food packs work the same way: only the ones that say so can be the main diet.

Dry, wet, or both?

Both have their strengths, and most cats do well on a mix.

Dry food is calorie-dense, cheaper, keeps well, and works in an automatic feeder. The downside is water: only 6-10%. A cat who doesn’t drink much gets little water through the day, and their urine runs more concentrated. For cats with lower urinary tract disease (FLUTD) or chronic kidney disease, vets usually suggest more wet food.

Wet food (cans, pouches, fresh packs) is usually 75% water or more, so the cat takes in a good amount of water with every meal. It costs more, doesn’t keep long once opened, and shouldn’t sit in a bowl or a puzzle feeder all day.

A pattern that suits most healthy adults: a complete wet meal morning and evening, with a measured portion of dry food in a puzzle feeder or slow bowl during the day. The cat gets more water, and a little fun finding food. On a tight budget, all-dry is fine too. Put out a few extra water bowls or a fountain to help your cat drink more.

How much: work back from calories

The weight-to-grams chart on the back of the bag is a rough guide. Two 4 kg cats’ calorie needs can differ by up to 30%, depending on whether they’re neutered, how active they are, and whether they have a chronic illness. For a closer number, work it out once with the calorie formula.

Step 1: calculate RER (Resting Energy Requirement)

RER is the energy a cat uses at complete rest, just for basic metabolism. Working out the daily amount starts from this number. The common simplified formula:

RER (kcal/day) = 30 × body weight (kg) + 70

A 4 kg adult cat has an RER of about 190 kcal/day, and a 5 kg cat about 220 kcal/day.

Step 2: factor in how your cat lives

Multiply by a factor for activity, neuter status, and age to get MER, the calories your cat needs each day:

Neutering lowers the calories a cat needs. The same 4 kg cat needs almost 40 kcal less a day. Keep feeding the pre-surgery amount, and many cats slowly put on weight in the months after.

Step 3: convert to grams

Once you have the daily calories, check the “kcal/kg” or “kcal/can” on the label and divide. A neutered 4 kg adult needs about 228 kcal a day. With a food at 3,800 kcal/kg (380 kcal per 100 g), that’s about 60 g a day, or 30 g each for a morning and an evening meal. If you mix wet and dry, the wet food’s calories count inside that 228 kcal too.

At the clinic where I work, I regularly watch vets pull out a calculator to work out how many calories a hospitalized cat needs for the day, then check it against what the cat actually ate. The math at home is the same idea.

Check the portion against your cat

The calculated portion is a starting point, and you adjust it as you watch your cat. Weigh them regularly, and feel their ribs and waist while you’re at it, to see whether the amount is right. The body condition and obesity guide walks through how to check, step by step.

How many times a day should you feed a cat?

Most adult cats do fine on 2 meals a day. There’s no single right number of meals. Getting the daily total right and feeding on a schedule matter more than the count. Roughly, by age:

• Kittens under 6 months: 3 meals a day
• Kittens 6 months to 1 year: 2 meals a day
• Adults and seniors: 2 meals a day

Cats naturally eat small meals often, so some owners split the daily amount into 3 or 4 small meals (morning, midday, evening, bedtime), which is closer to how cats eat. Two meals works just as well. Go with what fits your schedule.

If nobody’s home at midday, an automatic feeder is the easiest option: it feeds on time, in the right amount, and nobody has to rush home. For wet food, use a timed feeder with an ice pack, or make the midday meal dry.

Scheduled meals or free-feeding?

Pouring the whole day’s food into a bowl and letting the cat decide when to eat doesn’t suit most indoor cats, for three reasons:

1. A change in appetite is an early warning. Eating a little less is often the first sign of many problems (kidney disease, dental pain, pancreatitis, stress). With food always out, it’s hard to notice that a meal went untouched.
2. Cats aren’t good at limiting how much they eat. Indoor cats don’t move much, and with tasty food always in the bowl they easily overeat. Free-feeding is a common reason cats gain weight, and extra weight raises the risk of diabetes and arthritis.
3. Dry food left out all day goes stale. Over a day in the bowl, the fats oxidize, the kibble picks up moisture, and the smell fades.

The better default is measured, scheduled meals. Measure the day’s food with a kitchen scale or measuring cup, split it into meals, and pick up whatever isn’t eaten after 15 to 20 minutes.

Kittens, or underweight cats who need to gain, sometimes need food available all day. In that case, leave out dry food only, replace what’s left with fresh food every day, and weigh your cat once a week at the same time.

Switching foods: take 7 to 10 days

Switch too fast and cats often get diarrhea, vomit, or refuse to eat. Spreading the switch over 7 to 10 days is safer:

During the switch, keep an eye on the stool, any vomiting, and appetite. If any of these changes, go back to the previous ratio and stay there a few more days before moving on. Cats with sensitive stomachs can take 14 days.

The same pace works for any switch: kitten food to adult food, dry to wet, or onto a prescription diet. If your vet wants a faster switch for treatment (a urinary prescription diet, for example), switch the way your vet says.

Treats and toppers: under 10% of daily calories

Treats and toppers together should stay under 10% of daily calories. A neutered 4 kg cat eating 228 kcal a day has about 23 kcal of treat room: roughly 5 freeze-dried chicken pieces, or a small piece of boiled chicken breast.

When treats take up too much, the cat eats less of the main food and misses out on the nutrition built into it. Meat purees, juice from a can, and bits of chicken all count as treats, not just the ones sold in a treat bag.

For foods cats can’t eat, see the list of foods that are toxic to cats. Onions, garlic, grapes, chocolate, and raw dough are the ones to avoid, so don’t hand your cat bites of your own food.

Home-cooked food as an occasional topper is fine, as long as it fits inside the 10%. To feed it every day as the main diet, have a veterinary nutritionist work out the recipe. Recipes online rarely come out balanced. Raw meat is trickier: it can carry Salmonella and Toxoplasma, which can infect both your cat and your family, so talk to your vet before feeding it.

Puzzle feeders and slow bowls: make mealtime a task

Indoor cats often finish a bowl in moments and spend the rest of the time sleeping or staring at nothing. With energy and nowhere to put it, some cats start ambushing ankles or overgrooming.

Puzzle feeders and slow bowls turn a meal into a small task: the cat has to nose, paw, or roll the feeder to get the food out. That helps with weight, restlessness, and boredom. They range from rolling balls and sliding puzzles to homemade ones from paper tubes. Start with the easiest one and let your cat succeed a few times before making it harder. If the first one is too hard, they’ll just walk off. Wet food can go on a silicone lick mat stuck to the wall, and the cat spends about 10 minutes licking it clean.

Common feeding myths

“Dry food cleans a cat’s teeth”

Most kibble shatters at the first bite and barely touches the gumline, which is where tartar mainly builds up. Some dental kibble has large, specially textured pieces, so the cat has to bite through them before swallowing. For these, look for the VOHC (Veterinary Oral Health Council) seal on the bag. “Helps clean teeth” on its own doesn’t mean the food is certified. The cat dental health guide covers how to look after your cat’s teeth.

“Grain-free is healthier”

Grain-free food is everywhere, but cats digest cooked grains (rice, corn, wheat) without trouble, and a moderate amount gives them energy and fiber. There’s no evidence that grain-free food is better for the average cat. When choosing a food, check for the complete-and-balanced statement first. Whether it has grains comes second.

“More protein is always better”

Cats are obligate carnivores and need more protein than dogs, but that doesn’t make more always better. For a healthy cat, a complete and balanced food already has enough protein. Cats with kidney disease are often moved to a kidney prescription diet with controlled phosphorus and protein. To know what suits your cat, take their checkup results to your vet.

How Furwise helps

How much your cat ate each day, and whether their weight is going up or down this month, are things vets often ask at a visit. Log each meal and a regular weigh-in in Furwise, and you can open it at the appointment to show your vet. Family members who join as caregivers see the same records, so anyone can check whether the cat has been fed, and multi-cat homes get fewer “I thought you fed her” moments.

Frequently Asked Questions

How many meals a day should I feed my cat? Most adult cats do fine on 2 meals a day. Kittens under 6 months need 3 meals a day, and kittens from 6 months to 1 year need 2. Splitting the day’s food into 3 or 4 small meals is fine too, and closer to how cats naturally eat. There’s no single right number: getting the daily total right and feeding on a schedule matter more. If nobody’s home during the day, an automatic feeder helps.

Wet food or dry food, which is better? Both have their strengths, and most cats do well on a mix. Dry food is calorie-dense, cheaper, and works in an automatic feeder. Wet food is 75% water or more, so the cat takes in a good amount of water with every meal. A common pattern is a complete wet meal morning and evening, with a measured portion of dry food in a puzzle feeder or slow bowl during the day. For cats with FLUTD or chronic kidney disease, and cats who don’t drink much, vets usually suggest more wet food.

How many grams a day does a 4 kg neutered cat need? Start with calories: a 4 kg cat’s RER is 30 × 4 + 70 = 190 kcal, and a neutered adult needs about 1.2 times that, around 228 kcal. If the food is 3,800 kcal/kg (380 kcal per 100 g), that’s about 60 g a day, or 30 g morning and evening. Then weigh your cat regularly and feel their ribs: if the ribs are hard to feel, feed a little less, and if they stand out, feed a little more.

My cat is picky. What should I do? If your cat suddenly refuses a food they used to like, think of health first, such as dental pain, mouth inflammation, or kidney disease, and have your vet check them. If they’re healthy, pickiness often comes down to how they’re fed. When every refusal brings a new flavor, an opened can, or a squeeze of puree, cats quickly learn to wait for something better. Go back to scheduled meals: pick up whatever isn’t eaten after 15 to 20 minutes, offer the next meal on time, and don’t add anything in between. If your cat really doesn’t like their current food, switch to another complete and balanced food over 7 to 10 days.

My cat keeps getting diarrhea when I switch food. What should I do? Usually the switch is going too fast. Go back to the previous ratio, wait until the stool is normal, stay there a few more days, then move on more slowly. The whole switch can take up to 14 days. If the diarrhea continues even after stepping back, or comes with vomiting, low energy, or not eating, take your cat to the vet.

Can home-cooked food be my cat’s main diet? A little now and then as a topper is fine, as long as it fits inside 10% of daily calories. To feed it every day as the main diet, have a veterinary nutritionist work out the recipe. Recipes online rarely come out balanced: too little taurine harms the heart, and the wrong calcium-to-phosphorus balance affects the bones. These problems often aren’t found until the cat is already sick.

My cat suddenly stopped eating. What should I do? An adult cat who hasn’t eaten anything for a full day should see a vet. Kittens, overweight cats, and cats with a chronic illness need to go sooner. When a cat stops eating, fatty liver can start to develop within a few days, and the earlier the cause is found, the easier it is to treat. For ways to coax your cat to eat at home and which signs need a same-day visit, see cat not eating.

Can cats eat dog food? Not as a main diet. Dog food is made for a dog’s needs, and cats need more taurine and animal protein than dogs. Fed dog food long term, a cat can run short of taurine, which harms the heart and eyes. A bite or two is fine, but everyday meals should be cat food. If you have both, feed them in separate rooms, or use a feeder that opens only for your cat’s microchip.