Cat Food Calculator: Wet, Dry, or Mixed — Exact Daily Amounts

Most people who open a cat food calculator have a bowl at home that is never empty. It gets topped up when it looks low. Nobody has ever measured it, nobody knows what goes into it in a day, and the cat has been quietly setting her own portion for years.

I'm Dana Whitcomb, a certified veterinary technician. That bowl is the single most common thing standing between a cat and a healthy weight, and it isn't because anyone is careless. It's because a cat asking for food is very persuasive and a bowl gives you no information at all. So let's replace it with a number — starting with the question most of you actually came here to ask.

How much wet food to feed a cat

Answer first: divide your cat's daily calorie requirement by the calories per can printed on the label. That's the whole method, and the tool above does it — flip the segment to wet, type in the number off the can, and it hands you cans per day and cans per meal.

The reason nobody can give you a straight answer in an article is that wet food's calorie density varies more than any other pet food category. Across 790 cat diets surveyed for a 2025 study, wet foods ranged from 460 to 2,016 kcal per kilogram, median around 950. That's a more than four-fold spread. Two cans of the same size, from two brands, can be two completely different meals. Any page telling you "feed one can twice a day" without asking what's in the can is guessing.

For a benchmark you can sanity-check against: Tufts puts a medium 6 oz cat can at around 150 kcal or less for weight-management formulas. Use that to notice when a number looks wrong, not to replace reading your label.

And here's a gap I'm leaving open on purpose. We do not publish calorie figures for 3 oz or 5.5 oz cans — the two sizes most of you are actually holding. No primary veterinary source publishes them. Tufts benchmarks 6 oz and 13 oz only, and every 3 oz or 5.5 oz figure I chased traced back to a brand's own label or a blog copying one. Pâté and shreds from one brand aren't close to each other. The label lookup isn't us being lazy; it's the only honest answer that exists. If you searched how much wet food to feed cat or the fuller how much wet food to feed a cat calculator, both land in the same place: your can has the number, and this tool does the division.

Wet vs dry food for cats amounts, side by side

The maths doesn't change between them. Only the denominator does.

Dry food runs roughly 3× the calories of wet food for the same weight — about 3,606 kcal/kg against 1,198 — because canned food is mostly water. That single fact explains most feeding mistakes I see. A quarter cup of kibble and a quarter cup of pâté look like the same portion and are nothing like the same meal. So how much dry food to feed a cat is always a smaller-looking number than the wet equivalent, and that's physics rather than a judgement about which food is better.

Mixed feeding is genuinely common and barely served by any tool. The approach that works: pick one side and solve for the other. If your cat gets one 150 kcal can in the morning and her daily requirement is 234 kcal, then 84 kcal is left for kibble, and 84 divided by your bag's kcal per cup is the evening portion. Run the tool twice — once wet, once dry — and subtract. It's arithmetic, not a special mode.

The indoor cat correction every cat food calculator gets wrong

"Indoor" is not a separate factor. It doesn't exist as one anywhere in the veterinary literature I can find. AAHA, the Pet Nutrition Alliance and Merck all fold indoor and sedentary into the same row: overweight-prone / inactive = 1.0 × RER.

Now sit with what 1.0 actually means, because it's the most arresting number on this page. An inactive indoor cat's maintenance requirement equals its resting requirement. The activity surcharge rounds to zero. Everything your cat does in a day — the patrol, the window shift, the 3 a.m. sprint down the hallway — costs so little against her resting metabolism that the guidelines don't add anything for it.

That explains an enormous number of fat cats. People feed an indoor cat as though she's a small dog with a job. She isn't. She's a resting metabolism with opinions. It also explains why 1.2 is often the wrong choice for a cat who is neutered but never leaves the apartment — the inactive row fits her better, and it's 20% less food.

Cat feeding schedule: how often, and the free-feeding problem

Two meals a day is typical and works fine. More, smaller meals suit cats well — they're built to eat little and often, and there's nothing wrong with splitting the daily budget across three or four servings.

The part of a cat feeding schedule that matters isn't the number of meals. It's whether the day's food is measured. Free-feeding dry food is how most indoor cats get heavy, and the mechanism is boring: an always-available bowl means nobody knows the portion, so nobody can adjust it. You cannot correct a number you've never counted. Kittens are the reasonable exception — a growing kitten at 2.5 × RER has real demand, and Merck notes kittens may be fed free choice. An adult indoor cat at 1.0 × RER has no such margin.

How much to feed a cat chart

Find the weight, read across. The indoor column fits most cats reading this; the neutered column applies to a cat who genuinely moves around. The cans column assumes a 150 kcal can — check yours, because that's the whole point of this page.

Computed by Paw Charts from RER = 70 × kg^0.75 and the AAHA/PNA feline factors — paw-charts.com

Notice the curve. Doubling the cat doesn't double the food: a 10 lb cat needs 218 kcal and a 20 lb cat needs 366, not 436. That's the 0.75 exponent doing its work, and it's why the crude "25–35 kcal per pound" rule you'll see quoted around the web is wrong at both ends — it overfeeds small cats and underfeeds large ones. Metabolism doesn't scale in a straight line.

My own cat, for scale. Poppy is an 11 lb spayed indoor domestic shorthair, nine years old. Her RER is 234 kcal, and at the indoor factor of 1.0 her daily requirement is 234 kcal — the same number, which still looks like a typo every time I write it. Honest range: 117 to 351 kcal, because individual cats vary from the prediction by as much as ±50%. That's the published spread from the Pet Nutrition Alliance and Ohio State, and it's larger than any argument about whether her factor is 1.0 or 1.2 — which is what the cat calorie calculator shows you in full.

How many calories does my cat need?

Take her weight in kilograms, raise it to the power 0.75, multiply by 70. That's resting energy. Multiply by 1.0 if she's indoor or inactive, 1.2 if she's a neutered adult who moves, 1.4 if she's intact, 2.5 if she's a kitten. The cat calorie calculator does exactly this and shows the multiplier table with the places our sources disagree left visible rather than smoothed over. If what you wanted was a how much should i feed my cat calculator, that round trip is the whole of it: calories there, portions here.

Sixty-one percent, and why that number is the one to trust

As of APOP's 2022 clinical survey, 61% of US cats were overweight or obese — 28% overweight, 33% obese. That's veterinary professionals assessing body condition in the exam room, and it's the last such survey APOP has run.

You may see cheerier figures quoted from APOP's 2023, 2024 and 2025 releases. Don't use those as prevalence. They're opinion surveys — they measure what owners and vet teams think, not what anyone weighed, and APOP asks for them to be interpreted separately. Citing the 2025 figure as prevalence understates the real number badly and makes the trend look like it's improving when the clinical data says it hasn't moved in a decade.

The cat-versus-dog split is the interesting bit. Cats are less likely than dogs to be overweight-but-not-obese, and substantially more likely to be properly obese: 33% against 22%. Cats skew to the severe end. Which sets up the hardest thing on this page.

Weight loss, and the one warning that actually matters

Cats need to lose weight slowly. AAHA's target is 0.5–2% of body weight per week, and real cats come in at the bottom of it: a study of 413 client-owned cats found an achieved average of 0.8% ± 0.50 per week. Note the asymmetry against dogs, whose floor is 1% — you can see it side by side on the dog calorie calculator. Cats have a lower floor. A cat losing weight too slowly is a perfectly acceptable outcome. A cat losing weight too fast is a liver emergency, and that's not a figure of speech.

One myth to kill while we're here. You'll read that a cat must never lose more than 25% of her body weight. That figure is real but it's been turned inside out: Merck lists dramatic weight loss above 25% among the clinical signs of hepatic lipidosis that has already taken hold. It's a symptom, not a speed limit you're steering away from. Treating it as one gets the causation exactly backwards.

The tool handles this by running weight loss on ideal body weight rather than current — that's what the ideal weight field is for, and it's the detail most calculators get wrong. Feeding 0.8 × RER calculated on a cat's current, overweight body isn't a diet; it's maintenance with extra steps. Dogs and cats differ here too: the canine weight-loss factor is 1.0 at ideal weight where cats get 0.8, which the dog calorie calculator lays out if you have one of each at home.

Switching foods without causing the problem you're trying to solve

Slowly, and with a fallback. Introduce the new food alongside the old and shift the ratio over several days rather than swapping the bowl overnight. Watch that she's actually eating it — not sniffing it and walking off while you're at work. If she's eating less than usual two days running, stop and call your vet. The transition is the moment of risk, and the fix is almost always "go back to the old food and start over more slowly."

None of this is guesswork you have to take on faith — every formula is listed with its source and the date we last checked it on how we calculate. If a number here is wrong, that's where you'll catch us. The same engine drives all our dog and cat calculators: the dog food calculator does this page's job on the other side of the house, and the cat age calculator puts nine-year-old Poppy at 52 human years, squarely in the life stage where weight starts to matter more. The dog age calculator does that job for dogs, and openly disagrees with itself about the method — which is the point of it.