A typical 9 lb spayed indoor cat needs about 240 calories a day, which is roughly three 80-calorie cans or two and a half 100-calorie cans. The number of cans is not a fixed rule, because cans differ in size and density by a factor of two, so the calorie figure on your own label is what decides the portion.
Below is the amount by weight, how to read a can label, and how to split a diet between wet and dry without accidentally feeding two full diets.
Daily wet food by cat weight
These figures assume an adult spayed or neutered indoor cat and cans of 90 calories, a common mid-range value. Check your own label and adjust.
| Cat weight | Daily calories | Cans per day (90 kcal) |
|---|---|---|
| 7 lb | 200 kcal | 2.2 |
| 9 lb | 240 kcal | 2.7 |
| 11 lb | 275 kcal | 3.1 |
| 13 lb | 310 kcal | 3.4 |
| 15 lb | 345 kcal | 3.8 |
An intact adult needs roughly 15% more, a very active or outdoor cat more still, and a senior slightly less. Our cat food calculator applies those factors and works from your label rather than an assumed can.
How to read a can label
The number you want is stated as kcal per can or kcal per kilogram, usually in small print near the guaranteed analysis. If the label gives kcal per kilogram, multiply by the can weight in kilograms: a 3 oz can is 0.085 kg, so a food listed at 1,000 kcal/kg is 85 calories per can.
Feeding guides printed on the can are conservative and generic, and they tend to assume an average cat that does not exist. The calorie number is the reliable figure on the label; the feeding chart beside it is a suggestion.
Splitting wet and dry
Feeding both is common and perfectly sound. The mistake that causes weight gain is feeding a full wet portion and a full dry portion, which is two complete diets.
Split by calories, not by volume:
- Take the daily calorie total. For our 9 lb cat, 240 kcal.
- Decide the share. Half and half gives 120 kcal each.
- Convert each share with that food's own label. 120 kcal of 90-calorie cans is 1.3 cans. 120 kcal of 400 kcal/cup dry food is 0.3 cups.
The two portions together equal the same daily total. Any split works as long as the calories add up.
Why wet food portions look so large
Wet food is roughly 75% water, so it is about four times less calorie-dense by weight than kibble. Three cans a day looks like a great deal of food next to a third of a cup of dry, but the calories are identical.
That water is the main argument for wet food. Cats evolved from desert animals and drink poorly relative to their needs, so moisture arriving inside the food supports urinary tract health in a way a water bowl often does not.
How many meals
Two to three meals a day suits most adult cats, and matches how they eat naturally, which is many small meals rather than one large one. Kittens need more frequent feeding. Wet food should not sit out for more than an hour or two at room temperature.
If your cat begs constantly, that is usually not hunger. Cats ask for attention using the behaviour that has worked before, and food is what usually worked. Splitting the same daily total into more, smaller meals often solves it without adding calories.
Frequently asked questions
My cat eats less than the chart says. Is that a problem?
Not necessarily. The chart is an average and individual needs vary by 20% either way. Body condition is the real measure: you should feel the ribs easily without pressing, and see a waist from above. A cat holding steady weight in good condition is eating the right amount, whatever the chart says.
Is wet food better than dry?
Both can be complete diets, and the moisture content is wet food's genuine advantage. Dry food is cheaper per calorie and can be left out safely. Many cats do well on a mix, which is why the split method above exists.
How much should a kitten eat?
Considerably more per pound than an adult, because growth is expensive. A growing kitten uses a factor of about 2.5 times resting needs against 1.2 for a spayed adult, so a 5 lb kitten can need more food than a 9 lb adult cat.
What if I am switching brands?
Change over 7 to 10 days, mixing an increasing share of the new food, and recalculate the portion because the new food almost certainly has a different calorie density. A same-size can can differ by 40 calories between brands.
Does an overweight cat just eat less of the same?
Weight loss in cats needs to be slow and supervised, because rapid calorie restriction can cause serious liver problems. Talk to your veterinarian before putting a cat on a reduced-calorie plan rather than cutting the portion yourself.