How much food should a large cat eat? It depends on weight, age, and how active the cat is — not on the breed name alone. A large cat is one in the 5 to 11 kg size class, so daily food ranges from roughly 280 to 505 calories a day for a typical neutered indoor adult, and more for an active, outdoor, or intact cat. This guide works it out properly: the resting energy requirement (RER) formula vets use, the calorie table for large cats at different weights, grams per day, feeding by life stage, and the mistakes that most often lead to an overweight large cat.
Large breeds covered here include Maine Coons (typically 6–11 kg), Ragdolls (5–9 kg), Norwegian Forest Cats (5–9 kg), Turkish Vans (4–9 kg), Siberians (4–9 kg), Savannahs (5–11 kg), Chausies (5–11 kg), Pixie-Bobs (5–11 kg), Ragamuffins (5–11 kg), and Highlanders (5–11 kg). The figures below are ranges and starting points, not prescriptions — always adjust by body condition and your vet's advice. For large breeds without a published breed-standard range, the typical range for a large cat is 5 to 11 kg, which is an estimate, not a breed-specific measurement. A large cat's size also means its food bill is bigger and its mistakes are bigger: a scoop error that would barely matter for a 3 kg cat is a real share of an 8 kg cat's ration.
How many calories does a large cat need?
Veterinary nutritionists start with the resting energy requirement, or RER — the calories a cat burns at rest in a neutral temperature, doing nothing at all. The formula is:
RER = 70 × (body weight in kg)^0.75
For a large cat at the middle of the size class, about 8 kg, the RER is 70 × 8^0.75 ≈ 335 calories a day. Daily needs are then the RER multiplied by a factor for life stage and activity: about 1.2 for a typical neutered indoor adult, about 1.4 for an intact adult, about 1.4–1.6 for an active or outdoor cat, about 2.5 for a kitten, and about 1.1–1.4 for a senior. So a typical neutered indoor large cat of 8 kg needs about 400 calories a day, while the same cat living an active outdoor life could need about 500.
These factors are the standard ones used in veterinary nutrition, but they are still starting points. A large cat that sleeps most of the day indoors needs less than one that hunts, climbs, and plays for hours, and a cat that has been neutered typically needs about 10–20% fewer calories than before. The right amount is the one that keeps weight steady inside the breed's typical range: weigh the cat monthly, and if weight drifts up, cut food by about 10% and re-weigh in a month rather than changing everything at once. The cat food calculator works the same calculation out for any weight, and the large cat age guide explains the life stages the amounts below are built around.
Large cat daily calories by weight
| Body weight | Neutered indoor adult (×1.2) | Intact adult (×1.4) | Active / outdoor (×1.5) | Weight loss (×0.9) |
| --- | --- | --- | --- | --- |
| 5 kg | 280 | 330 | 350 | 210 | | 8 kg | 400 | 465 | 500 | 300 | | 11 kg | 505 | 590 | 635 | 380 |
Use the row nearest your cat's weight, then pick the column that matches the cat's life. A kitten's row is different — see the life-stage section below — and a pregnant or nursing large cat needs considerably more, which your vet should set individually. If your cat is between two rows, take the lower figure first: it is easier to add food to a cat that is losing weight than to take weight off a cat that has gained it, and large cats gain weight easily when food is guessed rather than measured — an 8 kg cat that eats 50 calories too many a day gains about a kilogram in a few months, and a kilogram on an 8 kg cat is an eighth of its body weight.
Note that calories are the real target and grams are only a translation. Different foods have very different calorie densities, so always check the kcal per 100 g on your own bag or tin and work from that. The grams figures below assume a typical dry food at around 350 kcal per 100 g — a common figure, but your food may differ, and the packet's number always wins over this guide's.
How much food in grams per day
| Body weight | Calories (neutered indoor adult) | Grams of dry food per day |
| --- | --- | --- | --- |
| 5 kg | 280 kcal | 80 g | | 8 kg | 400 kcal | 114 g | | 11 kg | 505 kcal | 144 g |
Split the daily amount into two meals for an adult large cat — morning and evening — or use a puzzle feeder so the cat works for its food, which slows eating and adds mental stimulation. A large cat eats more than a small one, so a puzzle feeder or a slow feeder is worth the effort: it stops the cat gulping a big meal in a minute and then begging for more. If you feed wet food, use the tin's kcal figure to convert: a typical wet food is around 70–100 kcal per 100 g, so an 8 kg large cat needing 400 calories would need roughly 470 g of wet food a day. Mixed feeding is fine as long as the total calories add up — the common mistake is to give a full measure of dry food plus a full pouch of wet food, which roughly doubles the ration.
Measure food with kitchen scales, not a scoop or a handful. A scoop in one house can be half as much again as a scoop in another, and that hidden extra is often the whole reason a large cat is overweight. Weigh the daily amount once, note what it looks like in your scoop, and use that scoop every time. Treats count too: they should stay under 10% of daily calories, which for an 8 kg large cat is under about 40 calories of treats a day — a few small treats, not a handful. The cat calorie calculator helps you stay inside that budget, and the large cat ideal weight guide explains how to judge whether the amount is right.
Feeding a large cat by life stage
Kitten (up to about 12 months, and longer for slow-maturing large breeds). A large kitten grows fast and needs a kitten food — one labelled complete and balanced for kittens — fed in three to four meals a day until about six months, then two meals a day. Use the ×2.5 factor on the RER at the kitten's current weight, and re-weigh every two weeks, because the amount changes quickly as the kitten grows. For a slow-maturing breed such as a Maine Coon, which may keep growing until it is about 3 to 5 years old, ask your vet when to switch from kitten food to adult food rather than switching at the first birthday out of habit. Do not overfeed a large kitten to make it grow faster: excess weight in kittenhood sets up weight problems for life, and steady growth matters more than fast growth.
Adult (about 1 to 10 years). Two meals a day, a complete adult food, measured amounts, and a monthly weigh-in. This is the stage where weight most often creeps up, because the cat has stopped growing but the owner keeps feeding kitten amounts, or because the cat becomes indoor-only while food stays the same. If your large cat is neutered, expect to cut food by roughly 10–20% after the operation and watch the waistline for the next few months. Active breeds such as Savannahs and Siberians need more food than calm ones such as Ragdolls, so judge by the individual cat, not the breed label alone.
Senior (from about 11 years). Older large cats often need fewer calories — the ×1.1–1.4 range — because they move less, but they still need good protein to hold muscle. A senior food, or an adult food fed in a smaller amount with your vet's agreement, is usually right. Some seniors develop kidney or other health issues that change the diet entirely, which is a vet decision, not a food-brand decision. Large cats may be prone to joint stiffness as they age, because there is more weight on the joints, so mention any change in appetite, thirst, weight, or jumping to your vet promptly rather than adjusting food on your own.
Common feeding mistakes with large cats
The most common mistake is free-feeding — leaving a full bowl of dry food down all day. It makes it impossible to know how much the cat has eaten, it hides appetite changes that are often the first sign of illness, and it is the fastest route to an overweight large cat, because a big cat can eat a lot without anyone noticing. The second is feeding by the packet's chart alone: packet charts are generous, because they are written for active cats and rounded up, so treat them as a maximum, not a target. The third is treat creep: a treat here, a piece of cheese there, and the cat's daily calories rise by a quarter without anyone noticing.
The fourth is milk: most adult cats cannot digest lactose well, and milk is not a substitute for water — fresh water should always be available, and a large cat needs more of it than a small one, so offer it in several places and consider a water fountain if your cat prefers running water. The fifth is switching foods suddenly, which upsets digestion — change foods gradually over a week, mixing the old and new in increasing proportions. And the sixth, specific to large cats, is feeding a small cat's portion to a big cat, or a big cat's portion to a small one: in a house with cats of different sizes, feed them separately, or the large cat will eat the small cat's food as well as its own.
Foods a large cat should never eat
Some everyday foods are toxic to cats and should never be given, in any amount: onions, garlic, leeks, and chives; chocolate and cocoa; grapes and raisins; xylitol (birch sugar, found in some sugar-free gum, sweets, and peanut butter); alcohol; and raw fish or raw meat that has not been handled safely. Lilies are also highly toxic to cats — even the pollen — so keep lilies out of a house with a cat. If your large cat eats any of these, call your vet or an animal poison line straight away — do not wait for symptoms and do not try to treat it at home. Keep a note of what was eaten, how much, and when, because the vet will ask. A large cat's size does not protect it: the dose matters, but so does the food, and some of these are dangerous at any dose.
Choosing a food for a large cat
Look for a food labelled complete and balanced for the cat's life stage, from a manufacturer that employs veterinary nutritionists and runs feeding trials — the label and the company's transparency matter more than the marketing on the front of the bag. Price is not a reliable guide to quality, and neither is the ingredient list alone: what matters is the nutrient profile and whether the food suits your individual cat's digestion, coat, weight, and energy. Cats are obligate carnivores, so their food must contain animal protein and nutrients such as taurine and arachidonic acid that cats cannot make themselves — a dog food, or a vegetarian diet, is not safe for a cat. For a large cat, a food with a larger kibble size can help, because big cats tend to gulp small kibbles, and a food formulated for large breeds may suit a Maine Coon or a Norwegian Forest Cat better than a food made for small cats. If your large cat has a health condition, ask your vet or a veterinary nutritionist before choosing a special diet — therapeutic diets are medicines in food form and should not be chosen by guesswork. The Maine Coon food guide and the Ragdoll food guide show how the same method applies breed by breed.
For related reading, see the cat food calculator, the large cat age guide, the large cat ideal weight guide, the Maine Coon food guide, the Ragdoll food guide, the cat breeds hub.
Frequently asked questions
How much food should a large cat eat per day?
A typical neutered indoor adult large cat of 8 kg needs about 400 calories a day, which is roughly 115 g of a typical dry food at 350 kcal per 100 g. At the ends of the size class the figure is about 280 calories at 5 kg and about 505 at 11 kg. Adjust by body condition and your vet's advice — active, intact, kitten, and senior cats all differ.
How many times a day should I feed a large cat?
Two meals a day for an adult large cat, morning and evening, or the same daily amount in a puzzle feeder. Kittens need three to four meals a day until about six months, then two. Free-feeding — leaving food down all day — makes portion control and appetite monitoring much harder, and it is the fastest route to an overweight large cat.
How many calories does a large kitten need?
Use the RER formula with a factor of about 2.5, applied to the kitten's current weight and re-checked every two weeks as the kitten grows. A kitten food labelled complete and balanced is the right base, and for a slow-maturing breed such as a Maine Coon your vet may advise staying on kitten food past the first birthday. A 2 kg kitten has an RER of about 120 calories, so it needs about 300 calories a day on the ×2.5 factor.
How do I know if my large cat is overweight?
Feel the ribs: you should feel them easily under a thin layer of fat without pressing hard. Look from above for a visible waist behind the ribs, and from the side for a tummy tuck. If you cannot feel the ribs or there is no waist, the cat is probably overweight — cut food by about 10%, keep treats under 10% of daily calories, and ask your vet to set a target weight. The cat ideal weight calculator gives a starting range.
Can a large cat drink milk?
Most adult cats cannot digest lactose well, so milk often causes an upset stomach and adds calories the cat does not need. Fresh water is what a cat needs — offer it in a clean bowl, away from the litter tray, and consider a water fountain if your large cat prefers running water. Kittens should have their mother's milk or a vet-recommended kitten milk replacer, never cow's milk.
What foods are toxic to a large cat?
Onions and garlic, chocolate, grapes and raisins, xylitol, alcohol, and lilies — even lily pollen — are all dangerous for cats. If your large cat eats any of them, call your vet or an animal poison line immediately and tell them what was eaten, how much, and when.
Results on this page are estimates for general information only and are not veterinary advice. If your pet is ill, underweight, overweight, pregnant, or has a health condition, consult your veterinarian before changing diet or care.