How Much to Feed a Cat: Real Numbers, a Calculator, and the Can Math
Every cat food label carries a feeding chart, and nearly every one is answering a different question than the one you are asking. The chart describes a generic cat: average build, average activity, intact metabolism, eating only that food. Your cat is specific. The honest way to feed the right amount is to work in calories, using the same equations veterinary teams use, then convert those calories into your food’s cans, cups, and meals. This page gives you the numbers, a calculator that does the arithmetic, and the reality checks the label leaves out.
Quick answer
A typical neutered adult cat in lean condition needs roughly 200 to 290 kilocalories per day across the common 3 to 5 kg (7 to 11 lb) range, per the veterinary reference chart below; bigger, leaner, or more active cats sit higher, and easy keepers sit lower. The unit that matters is the kilocalorie, printed on every bag and can, not the cup.
Convert calories to portions with the food’s own numbers: a 3 oz can of wet food commonly carries 70 to 100 kcal, a 5.5 oz can roughly 150 to 200, and dry foods often 350 to 500 kcal per cup, which is why “just a little kibble” quietly doubles a day. Feed measured meals, recheck body condition monthly, and let your veterinarian set targets for kittens, seniors, and any cat with a medical condition.
The only unit that matters
Cats do not eat cups; they eat calories. Every complete food states its energy under the label’s Calorie Content statement, usually as kcal per kilogram plus kcal per cup for dry and per can or pouch for wet. Dry foods differ substantially in calorie density, so the same cup of two foods can carry very different energy, and hand-scooped cups are unreliable measures in practice. This is why portion advice that starts with volume fails, and why every serious feeding plan starts with a daily calorie target and works backward to the scoop and the can.
What the veterinary equations actually say
The reference most veterinary teams lean on is the National Research Council’s maintenance energy requirement, and the World Small Animal Veterinary Association publishes an owner-facing chart built directly from it. Two things make it more honest than the linear rules of thumb you will meet elsewhere. First, the math is allometric: energy needs rise with body weight to a power, not in a straight line, so a 15-pound cat needs less than twice a 7-pound cat’s calories, not double and change. Second, it splits cats by build, because an easy-gaining cat genuinely runs on less.
| Weight | WSAVA guidance range, healthy adult |
|---|---|
| 3 kg (6.6 lb) | 200-210 kcal/day |
| 4 kg (8.8 lb) | 225-250 kcal/day |
| 5 kg (11 lb) | 250-290 kcal/day |
| 6 kg (13.2 lb) | 265-330 kcal/day |
| 7 kg (15.4 lb) | 280-370 kcal/day |
Those bands come from the WSAVA chart for healthy adult cats in ideal body condition, which itself states the underlying 2006 NRC equations: about 100 kcal times body weight in kilograms to the power 0.67 for a lean adult, and about 130 times weight to the power 0.4 for an obese-prone adult. The chart’s own caveat is worth repeating verbatim in spirit: these are guidance, not prescription, because individual cats vary. The calculator below runs exactly this math for your cat’s weight and build.
Cat food calculator
Daily calories from the NRC equations the WSAVA chart uses, converted to your food’s portions.
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Guidance for healthy adult maintenance only. For weight loss, growth, senior feeding, or any medical condition, use the calorie target your veterinary team sets; the portion conversions here can translate that vet-set number into cans and cups, but the calculator should not set it. Recheck body condition monthly and adjust.
The wet food answer
Wet food questions deserve concrete numbers, so here they are. Small 3 oz cans commonly run 70 to 100 kcal; the larger 5.5 oz cans run roughly 150 to 200; pouches usually sit between. A 10-pound lean cat needing around 250 kcal per day therefore eats roughly three 3 oz cans, or about a can and a half of the 5.5 oz size, spread over the day. Check your can, because recipes inside one brand can differ by a third, and a “gravy” line often carries fewer calories than a pate in the same size can.
Wet-heavy feeding adds water through every meal, where cats often under-drink, and portions are easy to meal out; protein and calorie density vary by formula, so the can’s own numbers decide. The practical downside is only logistics, opened cans need refrigerating, and grazing cats need the day split into more small servings.
Dry food: weigh it once, then trust grams
Dry food’s convenience hides its two traps. Its calories are dense, often 350 to 500 kcal per cup, so small scooping errors are large calorie errors. And free-pouring turns feeding into an estimate that always rounds up.
The fix costs five minutes: weigh the correct daily portion on a kitchen scale once, write the gram number on the bag, and measure by grams from then on. If your cat free-feeds today, moving to two or three measured meals makes daily intake visible and controllable, and it doubles as an early-warning system, because a skipped meal gets noticed the same day. A cat that starts leaving food behind belongs on our cat not eating guide timeline.
Meals, treats, and the multi-cat problem
Most adult cats do well on two meals a day, and many prefer three or four smaller ones; what matters is that the daily calories stay fixed while the schedule flexes. Treats count inside the day, not on top of it, and the working rule is that they stay under about a tenth of daily calories, roughly 25 kcal for a typical cat, which two or three commercial treats can consume entirely.
Multi-cat homes make portion control harder, because bowls are shared and a faster eater may finish another cat’s portion. The fixes are structural: separate rooms at mealtime, feeding stations out of each other’s sight lines, or a microchip feeder that opens only for one cat. If one cat needs a therapeutic diet, that separation stops being a convenience and becomes part of the treatment; our diabetic cat food guide covers the hardest version of this problem.
Recheck the cat, not the chart
Whatever number you start with, the cat is the feedback loop. Once a month, look from above for a visible waist behind the ribs, feel the ribs under a light touch, and weigh if you can; a home baby scale or a vet visit both work. Ribs becoming hard to feel or a disappearing waist means it is time for your veterinary team to confirm body condition and set a weight-management plan, the safe method in our overweight cat guide; do not judge from the loose belly pouch alone, which even lean cats carry.
Ribs that feel sharp, or any unplanned weight loss, moves the question from portions to health, weight loss you did not engineer is a vet conversation, not a feeding victory. Our overweight cat guide covers deliberate, safe weight change in both directions.
One more tool worth bookmarking: if your cat also takes a hemp supplement, our CBD dosage calculator does the same job for that bottle that this page does for the food bowl.
References and further reading
- WSAVA Global Nutrition Committee. Global nutrition guidelines, including the calorie needs chart for healthy adult cats (wsava.org).
- National Research Council. Nutrient Requirements of Dogs and Cats. National Academies Press, 2006.
Frequently asked questions
Is one cup of food too much for a cat?
For most cats, yes, if it is dry food. At 400 kcal per cup, a full cup substantially exceeds the daily starting estimate for a typical 10-pound cat. This is exactly why calorie math beats cup math.
How many times a day should a cat eat?
Two meals is the sturdy default; three or four smaller meals suit many cats even better. The daily calorie total matters more than the meal count. Some cats hold ideal condition on free-choice feeding, but it makes overconsumption and changing intake harder to detect.
How much wet food is that per day?
Work from your can’s kcal number: a 250 kcal day is about three 3 oz cans at 85 kcal each, or roughly a can and a half of a 170 kcal 5.5 oz can. The calculator above does this for your numbers.
Do indoor cats need fewer calories?
Usually somewhat fewer, because activity is lower, which is one reason the equations quote ranges and split by build. Start at the number for your cat’s weight and build, then let the monthly body check move it.
What about kittens, seniors, or cats with health conditions?
Different math in each case. Kittens run far above adult needs per pound (see the kitten feeding guide), seniors drift in both directions (see the senior cat diet guide), and medical diets come with vet-set targets that outrank every chart on this page.
This guide is educational and is not a substitute for veterinary diagnosis or care. Diet changes for a cat with a medical condition belong in a conversation with your veterinarian.