Cat food cans and pouches carry a feeding table, usually by weight band, with a suggested number of cans per day. It is a convenient start, but cats vary: neutered or not, lean or heavy, active or lazy, and often eating dry food or treats as well. The calorie method cuts through the variation. Work out what your cat needs in a day and divide by the kcal in one can. This guide shows the sum, offers tables for cats of 3 to 6 kg on three common can strengths, covers mixed feeding, storage and cost and lists the questions to ask your vet. The Cat Food Cans per Day Calculator does the arithmetic.
The formula
cans per day = daily calories ÷ kcal per can
For a neutered adult, daily calories are 1.2 × 70 × weight ^ 0.75: 238 kcal for a 4 kg cat. With 85 kcal per can, the cat needs 238 ÷ 85 = 2.8 cans a day when wet food is its only food.
Finding the kcal per can
| Label says | How to get kcal per can |
|---|---|
| kcal per can or pouch | Use it |
| kcal per 100 g | × can weight in g ÷ 100 |
| kcal per kg | × can weight in kg |
| Nothing | Ask the maker, or estimate from the analysis |
An 85 g can at 100 kcal per 100 g has 85 kcal. A 156 g can at 109 kcal per 100 g has 170 kcal. Labels sometimes show “kcal per 100 g ME” for metabolisable energy, which is the right figure to use.
Cans per day by cat weight
The table assumes neutered adults on wet food only.
| Cat | Daily kcal | 70 kcal cans | 85 kcal cans | 100 kcal cans | 170 kcal cans |
|---|---|---|---|---|---|
| 3 kg | 191 | 2.7 | 2.3 | 1.9 | 1.1 |
| 4 kg | 238 | 3.4 | 2.8 | 2.4 | 1.4 |
| 5 kg | 281 | 4.0 | 3.3 | 2.8 | 1.7 |
| 6 kg | 322 | 4.6 | 3.8 | 3.2 | 1.9 |
If your cat is intact (1.4), multiply by 1.17; if inactive (1.0), by 0.83. Always check weight and body condition, and adjust by about 10% if the trend is wrong. Our guide to how many calories a cat needs explains the factors.
Mixed wet and dry feeding
A common pattern is wet food at some meals and dry at others. The method: pick the share, convert calories to cans and grams.
| Wet share | Wet kcal | Cans of 85 kcal | Dry kcal | Dry grams (3,800 kcal/kg) |
|---|---|---|---|---|
| 25% | 60 | 0.7 | 178 | 47 |
| 50% | 119 | 1.4 | 119 | 31 |
| 75% | 179 | 2.1 | 60 | 16 |
(For a 4 kg cat needing 238 kcal.) Half a can of 85 kcal is 43 kcal, which is 18% of the cat’s day. Adding it to a full dry ration would overfeed by that much. See wet vs dry cat food for the full comparison and how much wet food a cat should eat for per-gram figures.
Dividing cans into meals
Cats often prefer several small meals. 2.8 cans a day might be four meals of 0.7 can. Cover leftovers and refrigerate them, and serve at room temperature. If the cat leaves wet food, take it away after the time on the label and note how much was eaten; if the cat habitually leaves some, you may be offering too much per meal. Weigh the food rather than counting spoons if precision matters.
Cost per can and per day
Cost per day is cans per day times price per can. A 4 kg cat eating 2.8 cans at 0.70 a can costs 1.96 a day, 58.80 a month. Per 1,000 kcal, that can costs 0.70 ÷ 85 × 1,000 = 8.24. A dry food at 6 per kg and 3,800 kcal/kg costs 1.58 per 1,000 kcal. Compare using the Pet Food Price per 1,000 kcal Calculator. Our guide on how much cat food costs per month gives more tables.
Kittens, seniors and special diets
Kittens use 2.5 times resting energy: a 2 kg kitten needs 295 kcal, which is 3.5 cans of 85 kcal, usually split over four meals. Seniors vary, so ask your vet. Cats on prescription diets should follow the vet’s feeding instructions; do not substitute cans of a different diet. Pregnant and nursing cats have higher needs and should be fed on your vet’s advice.
Storing and serving cans
Unopened cans should be kept in a cool, dry place, and checked for damage and dates. Once opened, cover and refrigerate, and use within the label’s time. Warm cold food to room temperature, since many cats refuse it cold. Use a shallow dish, and wash it after each meal. Do not mix new food on top of old in the bowl.
Common mistakes
- Relying on the can’s table.
- Mixing up can sizes.
- Adding wet food on top of the full dry ration.
- Forgetting treats.
- Leaving food out for hours.
- Not adjusting when weight changes.
- Switching brands suddenly.
Worked examples for three cats
Three cats with the same cans (85 kcal) but different needs.
| Cat | Weight | Factor | Daily kcal | Cans if wet only | If 50% wet |
|---|---|---|---|---|---|
| Small spayed female | 3 kg | 1.2 | 191 | 2.3 | 1.1 |
| Average neutered male | 5 kg | 1.2 | 281 | 3.3 | 1.7 |
| Indoor cat prone to weight gain | 5 kg | 1.0 | 234 | 2.8 | 1.4 |
The third cat weighs the same as the second but needs half a can fewer, because the vet has set a lower factor for an inactive cat. Half a can is 43 kcal, or 18% of 234. If the owner uses the can’s table, which may suggest 3.5 cans for a 5 kg cat, the cat will gain weight. Always work from calories, and adjust by about 10% from monthly weigh-ins.
Serving wet food through the day
Cats like small meals. A 2.8-can day can be four meals of 0.7 can, served at, say, 7:00, 12:00, 17:00 and 21:00. Keep an open can covered in the fridge, and bring a portion to room temperature before serving. Use a clean dish each time. Discard anything left after the time the label gives. Measuring with a kitchen scale is easier than judging fractions of a can: 0.7 of an 85 g can is 60 g.
| Fraction of an 85 g can | Grams | kcal at 1.0 kcal/g |
|---|---|---|
| 0.25 | 21 | 21 |
| 0.5 | 43 | 43 |
| 0.7 | 60 | 60 |
| 1 | 85 | 85 |
Mixing flavours and brands
Cats enjoy variety, but variety can complicate the arithmetic if cans differ in calories. Work out the calories in each can, and count calories, not cans. Keep a note of which flavours and brands your cat accepts. If you rotate brands, introduce a new one in small amounts, since cats can be sensitive. If your cat has a health condition, ask your vet which foods are suitable before mixing.
Questions owners ask in more depth
Why does my cat get fewer cans than the label says? Label tables are generous and cover a wide range of cats. Your cat’s calories depend on its weight, neutering and activity. Calculate, then check weight.
My cat only eats half a can at a time. Is that fine? Yes, if the total over the day matches the target. Refrigerate the rest, cover it and use it within the label’s time.
Can I feed one flavour only? If the food is complete and balanced, yes. Some cats prefer variety, and rotating within a range is fine; count the calories of each.
What if my cat leaves the jelly? Jelly or gravy contains water and some calories. If the cat habitually leaves it, the cat eats fewer calories than you think, and the label’s kcal per can may overestimate intake. Watch weight.
Is it OK to give the same can to two cats? Feed each cat its own measured portion. Sharing one bowl makes it impossible to know who ate what.
What should I do if my cat suddenly refuses cans? A change in appetite can signal illness, especially in older cats. Call your vet if your cat refuses food for a day, or sooner for a kitten or a cat with a health condition.
Pouches, trays and multipacks
Pouches and trays are measured the same way, by kcal per unit. Multipacks complicate budgeting, so work out the cost per can: a pack of 12 for 8.40 is 0.70 each. A cat eating 2.8 cans a day uses 84 cans a month, which is seven packs of 12. Keep a note of how long a pack lasts. For a 4 kg cat, 12 cans last 4.3 days. If your cat is on a mixed diet with 1.4 cans a day, a pack lasts 8.6 days. Use the Cat Food Cans per Day Calculator and the Pet Food Run-Out Date Calculator to plan reorders.
| Daily cans | Cans a month | Packs of 12 a month | Cost at 0.70 a can |
|---|---|---|---|
| 1.4 | 42 | 3.5 | 29.40 |
| 2.0 | 60 | 5.0 | 42.00 |
| 2.8 | 84 | 7.0 | 58.80 |
| 3.4 | 102 | 8.5 | 71.40 |
Allergies, sensitivities and special diets
If your cat has a diagnosed food allergy or sensitivity, your vet may recommend a particular diet and ask you to avoid others. In that case, do not use the can’s table or the mixing advice here; follow your vet’s plan, and check labels carefully for hidden ingredients. Keep a food diary and bring it to appointments.
A weekly review
Once a week, spend two minutes on the numbers: how many cans did the cat eat in total, did it leave any, what did it weigh, and did anyone give extras? Divide the week’s cans by seven to get the daily average, and compare with the target of 2.8 cans for a 4 kg neutered cat. If the average is above target and weight is rising, trim by a quarter can. If it is below and the cat is thin, ask your vet before raising it. A weekly check takes little time and prevents slow drift. Keep the numbers in a note on your phone, with the date and weight, and bring them to vet visits.
Quick summary
- Cans per day = daily calories ÷ kcal per can.
- A neutered 4 kg cat needs 2.8 cans of 85 kcal (238 kcal), if wet only.
- For mixed feeding, divide the wet share by kcal per can and cut the dry food.
- Compare cost per 1,000 kcal, not per can.
- Refrigerate opened cans, serve at room temperature and watch weight.
- Use the Cat Food Cans per Day Calculator.
Frequently asked questions
How many cans of cat food should a cat eat a day?
Divide the cat's daily calories by the kcal per can. A neutered 4 kg cat on 85 kcal cans needs about 2.8 a day if wet food is the only food.
How do I find the calories in a cat food can?
Look for kcal per can or per 100 g on the label. Multiply kcal per 100 g by the can weight in grams ÷ 100.
What if I feed wet and dry?
Decide what share of calories is wet, divide it by kcal per can, and reduce the dry food by the same calories.
Can I feed a cat one can a day?
Only if one can supplies its daily calories, or if the rest comes from other food. Check the numbers.
How long can an opened can stay in the fridge?
Follow the label, covering the can and serving at room temperature.
Are pouches the same as cans?
The sum is the same, using the kcal on the pouch.
How many cans for a kitten?
Use the kitten's calories (2.5 times resting energy) and divide by kcal per can.
Sources
- NRC (2006) Nutrient Requirements of Dogs and Cats, National Academies Press
- Pure arithmetic: cans = daily kcal ÷ kcal per can
Related calculators
- Cat Food Cans per Day CalculatorFind out how many cans of wet food your cat needs each day, week and month.
- Cat Food CalculatorWork out your cat's daily calories and how to split them between wet and dry food.
- Cat Calorie CalculatorWork out how many calories your cat needs each day, from its weight and life stage.
Keep reading
- How Much Wet Food Should a Cat Eat a Day?How much wet food a cat needs a day: grams and cans by weight, how kcal per can works, mixing wet with dry and how to avoid overfeeding with pouches and tins.
- Wet vs Dry Cat Food: Calories, Water and CostWet and dry cat food compared on water, calories per gram, grams needed, cost per 1,000 kcal and storage, with a worked example and a mixed-feeding plan.
- How Many Calories Does a Cat Need a Day?How many calories a cat needs: the RER formula, factors for neutered, intact, inactive and kitten cats, a calorie table by weight and how to adjust.
- How Overweight Is My Cat? Percent Over IdealHow far over ideal weight is a cat? (current − ideal) ÷ ideal × 100, the 10% per body-condition-point rule, a 4 kg ideal table and a worked 5.4 kg cat.