How much food should a small cat eat? Less than you think — and the margin for error is smaller than for any other size of cat. A small cat weighs 2 to 5 kg, so a typical neutered indoor adult needs only about 140 to 290 calories a day, and a single extra treat can be a tenth of the whole day's food. This guide is the small cat food calculator in words: the RER formula, the calorie table for small cats at 2, 3, 4, and 5 kg, grams per day, feeding by life stage, and the mistakes that most often lead to an overweight — or underfed — small cat.
Small breeds covered here include the Singapura (typically 2–3 kg), Korat (2–4 kg), Munchkin (2–4 kg), German Rex (2–4 kg), Devon Rex (3–5 kg), Cornish Rex (3–5 kg), and Oriental Shorthair (3–5 kg). The figures below are ranges and starting points, not prescriptions — always adjust by body condition and your vet's advice. For small breeds without a published breed-standard range, the figures are the typical range for a cat of this size, an estimate rather than a breed-specific measurement.
How many calories does a small 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 3 kg small cat, the RER is 70 × 3^0.75 ≈ 160 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 small cat of 3 kg needs about 190 calories a day, while the same cat living an active outdoor life could need about 240.
These factors are the standard ones used in veterinary nutrition, but they are still starting points. A small 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 on kitchen scales, 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.
Small cat daily calories by weight
| Body weight | Neutered indoor adult (×1.2) | Intact adult (×1.4) | Active / outdoor (×1.5) | Weight loss (×0.9) |
| --- | --- | --- | --- | --- |
| 2 kg | 140 | 165 | 175 | 105 | | 3 kg | 190 | 225 | 240 | 145 | | 4 kg | 240 | 275 | 295 | 180 | | 5 kg | 280 | 330 | 350 | 210 |
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 small 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 small cats gain weight easily when food is guessed rather than measured — a 200 g gain on a 2 kg Singapura is a tenth 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 |
| --- | --- | --- |
| 2 kg | 140 kcal | 40 g | | 3 kg | 190 kcal | 54 g | | 4 kg | 240 kcal | 69 g | | 5 kg | 280 kcal | 80 g |
Split the daily amount into two meals for an adult small cat — morning and evening — or use a puzzle feeder so the cat works for its food, which slows eating and adds mental stimulation. 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 a 3 kg small cat needing 190 calories would need roughly 224 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 small cat's whole daily ration may be only 54 g of dry food — a small scoop error is a large percentage of that. 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 a 3 kg small cat is under about 20 calories of treats a day — a couple of tiny treats, not a handful. The treat calorie calculator helps you stay inside that budget.
Feeding a small cat by life stage
Kitten (up to about 12 months). A small 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. Do not overfeed a kitten: excess weight in kittenhood sets up weight problems for life, and a small kitten that becomes an overweight adult is hard to slim down.
Adult (about 1 to 10 years). Two meals a day, a complete adult food, measured amounts, and a monthly weigh-in on kitchen scales. 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 small cat is neutered, expect to cut food by roughly 10–20% after the operation and watch the waistline for the next few months.
Senior (from about 11 years). Older small 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. Small cats may be prone to dental problems, so mention any change in appetite, thirst, or weight to your vet promptly rather than adjusting food on your own.
Common feeding mistakes with small 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 small cat. 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 — and a quarter of a small cat's daily calories is one or two treats.
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. 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 small cats, is feeding a large-cat portion: a bowl that looks right for a 6 kg cat is double what a 3 kg cat needs, and the cat will eat it if it is there. Measure every meal, every day, and the small cat will stay at its ideal weight.
Foods a small 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. For a small cat the danger is greater, because a small amount is a large dose relative to body weight — a few grapes that might make a large cat ill can be far more serious for a 2 kg Singapura. If your small 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.
Choosing a food for a small 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. If your small 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 Devon Rex food guide and the Cornish Rex food guide show how the same method applies breed by breed.
For related reading, see the cat food calculator, the small cat age guide, the cat ideal weight calculator, the Devon Rex food guide, the Cornish Rex food guide, the cat breeds hub.
Frequently asked questions
How much food should a small cat eat per day?
A typical neutered indoor small cat of 3 kg needs about 190 calories a day, which is roughly 54 g of a typical dry food at 350 kcal per 100 g. At 2 kg the figure is about 140 calories, and at 5 kg about 290. 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 small cat?
Two meals a day for an adult small 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.
How many calories does a small cat 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 your vet should check growth against the expected adult weight of the breed — typically 2 to 5 kg for small breeds.
How do I know if my small 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. Weigh the cat monthly on kitchen scales — a 200 g gain on a 2 kg cat is a tenth of its body weight. The cat ideal weight calculator gives a starting range.
Can a small 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 small 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 small cat?
Onions and garlic, chocolate, grapes and raisins, xylitol, alcohol, and lilies — even lily pollen — are all dangerous for cats, and a small cat is at greater risk because a small amount is a large dose for its body weight. If your small 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.