This wet cat food calculator tells you how many cans to feed per day and per meal, how many to buy each week and month, and what that costs. Pick your cat’s weight, life stage and the can or pouch you buy. Feeding a mix of wet and dry? It splits the calories for you.
How much wet food should a cat eat per day?
Most healthy adult cats that are spayed or neutered need about 25 calories per pound of body weight a day. For a 10 lb cat, that’s roughly 260 kcal. On an all-wet diet, it comes to about three and a quarter 3 oz cans a day or about one and a half 5.5 oz cans, depending on how many calories your brand packs in.
| Cat’s weight | Calories/day (neutered adult) | 3 oz cans (80 kcal) | 5.5 oz cans (160 kcal) |
|---|---|---|---|
| 6 lb (2.7 kg) | 178 kcal | 2 1/4 cans | 1 1/8 cans |
| 8 lb (3.6 kg) | 221 kcal | 2 3/4 cans | 1 3/8 cans |
| 10 lb (4.5 kg) | 261 kcal | 3 1/4 cans | 1 5/8 cans |
| 12 lb (5.4 kg) | 299 kcal | 3 3/4 cans | 1 7/8 cans |
| 14 lb (6.4 kg) | 336 kcal | 4 1/4 cans | 2 1/8 cans |
Treat these as starting points. Calories per can swing a lot between brands (a 3 oz can might hold anywhere from about 60 to over 100 kcal), so type in the number from your label for an exact answer. Is your cat 14 lb or more? Check the cat weight chart first. Plenty of cats that size are carrying extra weight and should be fed for their ideal weight instead.
How to read a wet cat food label
- Calorie content is usually printed as “kcal/kg” and “kcal/can” (or “kcal per pouch”). Use the per-can number in the calculator.
- Can size is listed in ounces and grams. A “3 oz” can is 85 g, and a “5.5 oz” can is 156 g.
- “Complete and balanced” (an AAFCO statement in the US) means the food can be the only thing your cat eats. Toppers, broths and “complement” foods aren’t complete, so they shouldn’t make up the whole diet.
- Feeding guides on the can are written for an average cat. Lots of indoor, neutered cats need less than the label says.
Wet vs dry food: why so many owners mix
Wet food is about 75–80% water. That helps cats who don’t drink much, and it supports urinary and kidney health. It also has fewer calories per mouthful, so cats feel full on less, which is handy if you’re watching their weight.
Dry food has its own perks. It’s cheaper, holds up in the bowl longer and works in puzzle feeders. A mix gets you some of both. Choose “half wet, half dry” (or another split) and the calculator shows the portion for each.
Tips for feeding wet food
- Split the day’s food into two to four small meals. That’s closer to how cats naturally eat than one big bowl.
- Keep opened cans covered in the fridge and use them within 2–3 days. Serve at room temperature, since a lot of cats turn their nose up at cold food. Don’t microwave it until it’s hot.
- Don’t leave wet food out all day. Pick up leftovers after about 30 minutes to 2 hours, sooner in warm weather.
- Switch foods slowly over 7–10 days, mixing in a bit more of the new food each day.
- Weigh your cat monthly. If they gain or lose weight you didn’t plan for, adjust portions by about 10%.
How the calculator works
First we work out your cat’s resting energy requirement (RER = 70 × body weight in kg0.75). Then we multiply it by a life-stage factor: 1.2 for a neutered adult, 1.4 intact, 1.0 for inactive cats, 0.8 for weight loss (at ideal weight), 1.1 for healthy seniors and 2.5 for kittens. The wet-food share of those calories gets divided by the kcal in one can or pouch. Weekly and monthly totals are rounded up so you don’t run short.
Frequently asked questions
How many cans of wet food should my cat eat a day?
About 3 to 3 1/2 small cans for a 10 lb cat. That’s for a typical adult eating only wet food, or about 1 1/2 large (5.5 oz) cans. Smaller or less active cats need less, and kittens need more per pound.
Is one can of wet food a day enough for a cat?
No, not on its own. One 3 oz can (about 80 kcal) is only a third of what an average adult cat needs. It works as part of a mixed diet if the rest comes from dry food. Try the “1/4 wet” option to see how much kibble to add.
How much wet food should a kitten eat?
About 2.5 times their resting energy, split into 3–4 meals. A 4 lb kitten needs roughly 270 kcal a day, or about three and a half 3 oz cans. Recalculate every couple of weeks while they grow.
Can I leave wet cat food out all day?
Better not. Wet food spoils at room temperature and draws flies. Offer measured meals and take away whatever isn’t eaten within a couple of hours.
How many ounces of wet food should a cat eat a day?
Usually 8–10 oz a day for an adult on an all-wet diet. That’s roughly 1 oz per pound of body weight. The calculator shows ounces and grams for your cat.