How Many Cans of Dog Food Per Day?

Quick answer Cans per day = the dog's daily calories ÷ kcal per can. A neutered 20 kg dog needs about 1,059 kcal, which is 2.7 cans of a 400 kcal can or 3.2 cans of a 330 kcal can if the dog eats only wet food. If wet food is half the calories, halve it: about 1.3 cans of 400 kcal.

The side of a can of dog food usually carries a feeding table by weight. It is easy to follow and easy to get wrong. The table does not know whether your dog is neutered, whether it also eats dry food, how many treats it gets or whether the dog is on a diet. The reliable way is to work from calories: decide what your dog needs in a day and divide by the calories in a can. This guide shows the sum, gives tables for dogs from 5 to 40 kg on two common can strengths, shows how to handle mixed feeding and explains storage and cost. The Dog Food Cans per Day Calculator does the arithmetic with your numbers.

The formula

cans per day = daily calories ÷ kcal per can

Daily calories for a neutered adult are 1.6 × 70 × weight ^ 0.75. For a 20 kg dog that is 1,059 kcal. If a can has 400 kcal, the dog needs 1,059 ÷ 400 = 2.65 cans a day when wet food is the whole diet.

Finding the kcal in a can

Labels show energy in different ways. Convert what you find:

Label says	How to get kcal per can
kcal per can	Use it directly
kcal per 100 g	kcal per 100 g × can weight in g ÷ 100
kcal per kg	kcal per kg × can weight in kg
No energy	Ask the maker, or estimate with the Dog Food kcal Calculator

A 400 g can with 100 kcal per 100 g has 400 kcal. A 300 g can at 110 kcal per 100 g has 330. Our guide to reading a dog food label explains the energy statement.

Cans per day by dog size

The table assumes neutered adults and wet food as the only food.

Dog	Daily kcal	330 kcal cans	400 kcal cans
5 kg	374	1.13	0.94
10 kg	630	1.91	1.57
20 kg	1,059	3.21	2.65
30 kg	1,436	4.35	3.59
40 kg	1,781	5.40	4.45

For a 20 kg dog, that is 3.2 cans of 330 kcal or 2.65 of 400 kcal. The difference between can strengths is large, so never guess. If your can is a different size, divide by its own kcal. Intact dogs need 1.8 times resting energy and inactive dogs 1.4, so adjust the calories first.

Mixed feeding: wet as part of the day

Many owners give half a can on top of dry food. Work out the share:

Wet share	20 kg dog wet kcal	Cans of 400 kcal	Dry kcal	Dry grams (3,800 kcal/kg)
10%	106	0.26	953	251
25%	265	0.66	794	209
50%	530	1.32	530	139
75%	794	1.99	265	70

Half a can is 200 kcal, which is 19% of the dog’s day. If you add half a can without reducing the dry food, the dog gets 19% too many calories. Our guide to feeding wet and dry together covers the arithmetic, and the Dog Wet & Dry Food Calculator splits the day for you.

Puppies, seniors and weight loss

Puppies under about 17 weeks use 3.0 times resting energy, then 2.0, so cans per day change every couple of weeks as weight rises; see the puppy feeding chart. A dog on a weight-loss plan eats from the goal weight’s calories, not the current weight’s. Senior dogs vary; ask your vet. For prescription diets in cans, follow your vet’s feeding instructions.

Cost per can and per day

The cost per day is cans per day times the price per can. A 20 kg dog on 2.65 cans at 1.50 a can costs 3.98 a day, 119 a month. The same calories from a dry food at 4.00 per kg cost about 1.18 a day. Cans are dearer per 1,000 kcal in most cases, so many owners use them for part of the day. The Pet Food Price per 1,000 kcal Calculator compares them.

Food	Price	kcal	Cost per 1,000 kcal
Can, 400 kcal	1.50	400	3.75
Can, 330 kcal	1.30	330	3.94
Dry, 3,600 kcal/kg	4.00 per kg	3,600 per kg	1.11

Storage and serving

Once opened, cover a can and keep it in the fridge, using it within the time on the label. Serve at room temperature, since cold food is less appealing. Remove uneaten food from the bowl after the time the label gives. Wash bowls after wet meals. Unopened cans should be stored in a cool, dry place; check the best-before date. Do not feed from a damaged or bulging can.

Fitting cans into meals

If you divide the day into two meals, serve half the cans at each; for 2.65 cans, that is 1.3 cans per meal. Tins that cannot be divided neatly can be rounded to the nearest quarter, with the dry food adjusted to compensate. Keep a note of the plan on the fridge so that everyone feeds the same.

Common mistakes

Using the can’s table instead of calories.
Adding wet food on top of the full dry portion.
Mixing up 330 and 400 kcal cans.
Forgetting treats.
Leaving opened cans out of the fridge.
Not recalculating when weight changes.
Comparing price per can instead of per 1,000 kcal.

Worked examples for three dogs

Three dogs with different cans and needs.

Dog	Weight	Daily kcal	Can	Cans if wet only	If 25% wet
Small neutered	8 kg	533	400 kcal	1.33	0.33
Medium neutered	20 kg	1,059	330 kcal	3.21	0.80
Large intact	35 kg	1,612 × 1.8 ÷ 1.6 = 1,813	400 kcal	4.53	1.13

(For the large intact dog, the neutered figure of 1,612 kcal is multiplied by 1.8 ÷ 1.6 to give the intact figure.) A quarter of the calories as wet food is easy to manage: about 0.3 of a can for the small dog and 1.1 cans for the large one. Round to the nearest quarter and adjust the dry food to match.

Splitting cans between meals and dogs

If you feed two meals a day, divide the cans equally. For 3.21 cans, that is 1.6 cans per meal, which is awkward; round to 1.5 and add a little more dry food to compensate. For several dogs, feed each from its own bowl, with the amount written on a card. Do not guess by eye; weigh the contents of a can once to learn how many grams it holds, and weigh portions. A 400 g can divided into quarters gives 100 g portions, each 100 kcal at 1.0 kcal/g.

Cans for puppies, seniors and dogs on diets

Puppies’ needs rise quickly, so the number of cans changes every couple of weeks; see the puppy feeding chart. A puppy of 5 kg under 17 weeks needing 702 kcal would eat 1.75 cans of 400 kcal if wet only. For seniors, the target may be lower or higher depending on weight and health, so ask your vet. For dogs on weight-loss plans, use the plan’s calories, not the current weight’s, and consider a weight-management can designed for satiety. In all cases, weigh the dog regularly and adjust.

Questions owners ask in more depth

The can says one can per 5 kg. Is that right? That is a rule of thumb for a typical dog on a typical can. For a neutered 20 kg dog it gives 4 cans, which would be 1,600 kcal of a 400 kcal can, 51% over the 1,059 kcal target. Calculate from calories.

Can I feed cans to a puppy? Yes, if the can is complete and balanced for growth. Calculate from the puppy’s calories, which are higher per kilogram, and recalculate as it grows.

Do cans cause loose stools? A sudden change in diet can. Introduce wet food gradually, and call your vet if loose stools persist.

What about large cans of 1 kg or more? Divide the contents into portions, refrigerate and use within the label’s time. Weigh portions rather than guessing.

Is a can a complete meal? Only if the label says so. Some cans are complementary and should be mixed with another food.

Can my dog share a can with my cat? No. Dog and cat foods differ in nutrients, and cats in particular need food made for cats.

Pouches, trays and multipacks

Wet dog food also comes in pouches and trays, with kcal per unit. Work out the cost per unit and per 1,000 kcal. A case of 12 cans of 400 kcal at 15.60 is 1.30 a can, or 3.25 per 1,000 kcal. A dog eating 2.65 cans a day uses 80 cans a month, nearly seven cases. Plan storage space accordingly; cans take room. Rotate stock, with older cases at the front, and check dates.

Cans per day	Cans a month	Cases of 12	Cost at 1.30 a can
0.5	15	1.25	19.50
1.0	30	2.5	39.00
2.65	80	6.6	103.35
4.5	135	11.3	175.50

Wet food in a food-dispensing toy

Wet food can be used in lick mats and stuffable toys to keep a dog busy. Measure the portion first, count it in the day’s calories and freeze it if the toy suits, following the maker’s guidance. It slows eating and offers enrichment. Supervise your dog with new toys.

A weekly review

Once a week, add up the cans the dog ate, divide by seven and compare with the target, such as 2.65 cans of 400 kcal for a neutered 20 kg dog. Note the dog’s weight and body condition, and whether any treats or scraps were given. If the average is above target and weight is rising, trim by a quarter of a can. Keep a note on your phone, and bring it to vet visits. The habit takes two minutes and prevents slow drift in weight.

Quick summary

Cans per day = daily calories ÷ kcal per can.
A neutered 20 kg dog needs 2.65 cans of 400 kcal or 3.2 cans of 330 kcal if wet only.
For mixed feeding, divide the wet share of calories by kcal per can and cut the dry food.
Compare cost per 1,000 kcal, not per can.
Refrigerate opened cans and use them in time.
Use the Dog Food Cans per Day Calculator.

Frequently asked questions

How many cans of dog food should I feed a day?

Divide the dog's daily calories by the kcal in one can. A neutered 20 kg dog on 400 kcal cans needs about 2.7 a day if wet food is the only food.

How do I find the kcal in a can?

The label may show kcal per can or per 100 g. Multiply kcal per 100 g by the can weight in grams ÷ 100.

What if I feed wet and dry together?

Decide the wet share of calories and divide that share by kcal per can.

Can I split a can between meals?

Yes. Cover and refrigerate the rest and use within the time on the label.

Are cans cheaper than dry food?

Usually not per 1,000 kcal. Compare using the cost per 1,000 kcal.

How many cans for a small dog?

A neutered 5 kg dog needs about 374 kcal, 0.9 of a 400 kcal can.

How many cans for a puppy?

Use the puppy's calorie target (3.0 times resting energy before about 17 weeks, then 2.0).

Sources

NRC (2006) Nutrient Requirements of Dogs and Cats, National Academies Press
Pure arithmetic: cans = daily kcal ÷ kcal per can

Reviewed by the CalcuPaw Veterinary Review Team

Last reviewed 19 Oct 2026 · Meet the review team · This guide is general information, not veterinary advice.