How much wet food should my cat eat?
Start from your cat's daily calories, then divide by the calories in one can of the food you buy. The calculator does both, from the AAHA's veterinary guidelines.
Calories first, then cans
"One can a day" can't be right for every cat, because cans differ in size and recipe, and cats differ in weight and lifestyle. The reliable way is in two steps:
- Your cat's daily calories. The AAHA's guidelines start from resting energy, 70 × body weight in kg to the power 0.75, and multiply it by a life-stage factor: 1.2–1.4 for a neutered adult, 1.4–1.6 for an intact adult, 1.0 for an inactive cat or one that gains weight easily, and 2.5 for a growing kitten.
- The food's calories. Divide the daily calories by the kcal per can printed on the label.
For a 10 lb neutered adult that's 261–305 kcal a day. With a can that lists 95 kcal, 261 ÷ 95 and 305 ÷ 95 give 2.7 to 3.2 cans a day.
Daily calories by weight
For adult cats at a healthy weight, from the AAHA formula. Use your cat's current weight, if a vet agrees it's a healthy one.
| Cat's weight | Neutered adult | Intact adult | Inactive or gains easily |
|---|---|---|---|
| 6 lb (2.7 kg) | 178–208 kcal | 208–237 kcal | 148 kcal |
| 8 lb (3.6 kg) | 221–258 kcal | 258–294 kcal | 184 kcal |
| 10 lb (4.5 kg) | 261–305 kcal | 305–348 kcal | 218 kcal |
| 12 lb (5.4 kg) | 299–349 kcal | 349–399 kcal | 249 kcal |
| 14 lb (6.4 kg) | 336–392 kcal | 392–448 kcal | 280 kcal |
| 16 lb (7.3 kg) | 371–433 kcal | 433–495 kcal | 310 kcal |
Daily energy = 70 × kg0.75 × the AAHA life-stage factor, rounded. A starting estimate: AAHA notes indoor and less active cats may need less, and to adjust by watching weight and body condition.
Finding the calories on the can
The AAHA guidelines note that AAFCO requires calorie content on dog and cat food labels, treats included. Look for the line that gives kcal per can, and use that number. Wet food is mostly water: Cornell says canned cat food is at least 75% water, against 6–10% for dry food, which makes it a good source of water but means a can holds far fewer calories than the same weight of kibble.
Mixing wet and dry food
Split the calories, not the volume. If half the day's calories come from wet food, a 10 lb neutered cat gets about 131–153 kcal from cans and the rest from kibble, measured by the kcal per cup on the bag. Choose "Wet and dry" in the calculator and set the wet share.
How many meals?
The calculator only divides the day's amount into the meals you choose. On how to feed, the American Association of Feline Practitioners' feeding consensus statement says one bowl left out, or one or two large meals, doesn't meet cats' behavioral needs. It suggests feeding programs suited to each home, often with frequent small meals, puzzle feeders and food in different places. Cornell advises refrigerating the unused part of an opened can.
Treats count too
WSAVA advises keeping treats under 10% of a cat's daily calories; Cornell says 10–15% at most. Set the treat share in the calculator and it takes those calories out of the food.
Check, then adjust
Every number here is a starting point. AAHA's advice is to adjust by watching body weight and body condition, which your vet can score. Cornell describes obesity as 20% or more above normal weight, judged on a 9-point body condition score where 4.5 to 5 is ideal. For a cat that's overweight or underweight, pregnant or nursing, ill or on a prescription diet, the amount should come from your veterinarian. See the cat weight chart for average adult weights by breed.
Questions owners ask
How many cans of wet food should a cat eat a day?
It depends on the calories in the can, which vary a lot between foods and can sizes. Work out your cat's daily calories, then divide by the kcal per can on the label. A 10 lb neutered adult needs about 261–305 kcal a day on the AAHA's guidelines, so with a 95 kcal can that's about 2.7–3.2 cans.
Is one can of wet food a day enough for a cat?
Only if that can holds about as many calories as your cat needs in a day. Check the calorie line on the label and compare it with the calculator's result.
Can I feed my cat only wet food?
Yes, if it's complete and balanced for your cat's life stage. Cornell notes that some cats prefer canned food, some dry and some a mix, and that the choice can be a matter of what your cat prefers once the food is complete and balanced.
Should I leave wet food out all day?
Cornell advises refrigerating any unused part of an opened can. It notes that dry food suits free-choice feeding because it doesn't dry out.
How much wet food should a kitten eat?
Growing kittens need more calories for their weight: the AAHA guidelines use 2.5 times resting energy, against 1.2–1.4 for a neutered adult. Choose Kitten in the calculator's life stage for a weaned kitten.