Cats are easy to overfeed and surprisingly hard to portion correctly — the label guidelines are vague, free-feeding is the norm, and feline obesity is rampant. Here's how to work out exactly how much your cat should eat each day.
Feeding a cat looks simple: fill the bowl, watch it empty. But the feline obesity numbers tell another story — the Association for Pet Obesity Prevention estimates around 60% of US cats are overweight or obese, and the leading cause is simply giving them more food than they burn. Cats are small, their calorie needs are modest, and the difference between the right amount and too much can be just a few extra kibbles a day. Here's how to get it right.
The short answer
An average healthy adult cat (around 10 lb / 4.5 kg) needs roughly 180–250 calories per day, which usually works out to about ¼ to ⅓ cup of dry food, or two to three small cans of wet food, depending on the brand's calorie density. But "average" hides a lot: kittens, seniors, active cats, and overweight cats all differ. The only reliable way to portion is by calculating your specific cat's needs and reading the calorie content (kcal) on your specific food. Our cat calorie calculator does the math for you.
The vet calculation
Veterinarians use a two-step formula. First, Resting Energy Requirement (RER): the calories a cat needs at rest, calculated as 70 × (body weight in kg)0.75. Then that number is multiplied by an activity/life-stage factor:
- Weight loss: 0.8 × RER (using target weight)
- Neutered adult, normal activity: 1.2 × RER
- Intact adult: 1.4 × RER
- Active cat: 1.6 × RER
- Kitten (growth): 2.5 × RER
- Pregnant or nursing: up to 2–6 × RER
For a 10 lb (4.5 kg) neutered indoor cat, RER ≈ 70 × 4.50.75 ≈ 217 calories, and 1.2 × 217 ≈ 260 calories per day as a maintenance starting point (many indoor cats need a bit less). This is a starting estimate — you then adjust based on body condition over a few weeks.
Wet, dry, or both?
Both can be complete and balanced if labeled as meeting AAFCO standards. Many vets favor including wet food because cats evolved as desert animals with a low thirst drive and tend to be chronically under-hydrated; wet food adds significant moisture, which supports urinary and kidney health. Dry food is convenient and cheaper but calorie-dense and easy to over-pour. A common approach is measured wet food plus a measured amount of dry. Whatever you choose, the key is measuring — our cat food portion calculator converts calories into cups or cans, and our water intake calculator helps you check hydration.
How often to feed
Cats are natural grazers who, in the wild, eat many small prey-sized meals a day. Two to three measured meals daily suits most cats, and puzzle feeders or timed feeders can spread intake out in a more natural, enriching way. The trap is free-feeding dry food: it's the single easiest path to obesity because most cats will happily eat well past their needs. If you do leave dry food out, measure the full day's portion into the bowl rather than topping it up.
Adjusting for life stage and weight
- Kittens need roughly 2–2.5× the calories of an adult per pound, fed three to four times a day, on kitten-formulated food until about 12 months.
- Seniors often need fewer calories as they slow down, but very old cats can lose weight and muscle and may need more — watch body condition closely, since weight loss can also signal disease.
- Overweight cats need a vet-supervised plan: cats must never crash-diet, as rapid weight loss can trigger a dangerous liver condition called hepatic lipidosis. Use our cat weight-loss calculator and go slowly.
How to check you've got it right
Numbers are a starting point; your cat's body is the real test. Every few weeks, run your hands over their ribs — you should feel them easily under a thin layer of fat, like the back of your hand, and see a slight waist from above. Ribs you can't feel mean too much food; sharply visible ribs and spine mean too little. Adjust the portion by about 10% and reassess. Sudden appetite or weight changes warrant a vet visit; cats hide illness well, and our guide on feline lifespan covers the wellness monitoring that keeps them healthy longest.
Common cat feeding mistakes
Most feline weight problems come down to a handful of avoidable habits:
- Free-feeding dry food: the number-one cause of overeating — cats rarely self-regulate when calorie-dense kibble is always available.
- Eyeballing portions: "about a scoop" drifts upward over time. Measure with an actual cup or kitchen scale.
- Forgetting treats count: treats and dental snacks add calories that should come out of meals.
- Topping up the bowl: refilling before it's empty makes the daily amount impossible to track.
- Feeding to stop the 5 a.m. meowing: rewarding the behavior teaches the cat to wake you — a timed feeder breaks the cycle.
Treats, milk, and table scraps
Apply the same 10% rule cats and dogs share: treats shouldn't exceed about 10% of daily calories. Skip cow's milk — most adult cats are lactose intolerant and it causes digestive upset, despite the storybook image. Be cautious with table scraps, too: several common human foods are toxic to cats, which our list of foods toxic to cats spells out. If you give treats, subtract those calories from meals so the daily total holds.
Feeding in a multi-cat household
Multiple cats make portion control harder, because a confident cat will happily finish a timid one's food. Feed cats in separate bowls, ideally in separate spots or even rooms, and supervise or use microchip-activated feeders so each cat eats only its own ration. This also lets you monitor each cat's appetite individually — critical, since a drop in one cat's intake is easy to miss when bowls are shared and is often the first clue of illness.
Switching your cat's food safely
Cats are famously resistant to dietary change, and switching abruptly often causes refusal or stomach upset — or worse, a stressed cat that stops eating, which in cats can quickly become dangerous. Always transition over 7 to 10 days, mixing a little more of the new food into the old each day until you've fully changed over. If your cat picks out the old food and leaves the new, slow the pace right down. Warming wet food slightly to release its aroma, and keeping mealtimes and bowls consistent, makes new food far more acceptable to a wary cat.
The bottom line
Most adult cats need around 180–260 calories a day, but the right number depends on weight, age, and activity — so calculate it, then read the kcal on your specific food to set the portion. Measure every meal, favor some wet food for hydration, avoid free-feeding dry food, and let your cat's body condition fine-tune the amount. A correctly portioned cat is a healthier, longer-lived cat.
Frequently asked questions
How much should I feed my cat per day?
An average 10 lb adult cat needs roughly 180–260 calories a day, often about a quarter to a third of a cup of dry food or two to three small cans of wet food, depending on the food's calorie density. Calculate your cat's specific needs by weight and activity, then read the kcal on your food to set the exact portion.
Should I feed my cat wet or dry food?
Both can be complete if they meet AAFCO standards. Many vets recommend including wet food because cats have a low thirst drive and tend to be under-hydrated, and wet food adds moisture that supports urinary and kidney health. A mix of measured wet and dry is a common, sensible approach.
How often should I feed my cat?
Two to three measured meals a day suits most cats, since they naturally eat small, frequent meals. Puzzle or timed feeders can spread intake out. Avoid leaving dry food out all day, which is the easiest route to overeating and obesity.
Is my cat overweight?
Feel for the ribs: you should be able to feel them easily under a thin fat layer and see a slight waist from above. If you can't feel the ribs, your cat is likely overweight. Never crash-diet a cat — rapid weight loss can cause a dangerous liver condition. Work with your vet on a gradual plan.