How Much Wet Food Should a Cat Eat a Day?

Quick answer A neutered adult cat eating only wet food of about 1,000 kcal/kg needs roughly 1 gram per calorie: 141 g for a 2 kg cat, 191 g for 3 kg, 238 g for 4 kg and 281 g for 5 kg. Check the kcal per can on your own label, because wet foods vary.

Wet cat food looks like plenty, which is exactly why it is easy to get the amount wrong in either direction. A can of 85 g looks small for a hungry cat, and a pouch of 100 g looks generous, yet what matters is the calories inside. This guide shows how to work out how much wet food a cat should eat, how to convert grams into cans and pouches, how to combine wet with dry and how to read the calorie information on the label.

Start from the calories

The daily energy for a neutered adult cat is 1.2 × RER, where RER = 70 × weight in kg ^ 0.75. For the full explanation, see our guide on how many calories a cat needs. Then:

grams of wet food = daily calories ÷ (kcal per kg ÷ 1,000)

For a food of 1,000 kcal/kg, that means one gram per kilocalorie, which makes the arithmetic easy: a cat that needs 238 kcal eats 238 g.

Wet food by weight and can size

Cat weight	Daily calories	Wet food at 1,000 kcal/kg	Cans of 85 g	Pouches of 70 g
2 kg (4.4 lb)	141	141 g	1.7	2.0
2.5 kg (5.5 lb)	167	167 g	2.0	2.4
3 kg (6.6 lb)	191	191 g	2.2	2.7
3.5 kg (7.7 lb)	215	215 g	2.5	3.1
4 kg (8.8 lb)	238	238 g	2.8	3.4
4.5 kg (9.9 lb)	260	260 g	3.1	3.7
5 kg (11 lb)	281	281 g	3.3	4.0
6 kg (13.2 lb)	322	322 g	3.8	4.6

The columns assume an energy of 1,000 kcal per kg, which is a typical figure but not a standard. If your wet food has fewer calories per gram, the amount goes up: a 4 kg cat on a 800 kcal/kg food needs 238 ÷ 0.8 ≈ 298 g. If it has more, the amount goes down. The Cat Food Cans per Day Calculator takes your can size and energy and shows cans per day, per week and per month.

Reading kcal per can

Many labels, especially in North America, give calories per can or per pouch rather than per kilogram. The sum is then:

cans per day = daily calories ÷ kcal per can

For a 4 kg cat needing 238 kcal and a can with 85 kcal, that is 2.8 cans. If the label gives kcal per kg instead, convert: kcal per can = kcal per gram × grams in the can. A can of 85 g at 1,000 kcal/kg holds 85 kcal. If a can lists 70 kcal and weighs 85 g, the food is about 820 kcal/kg and the cat needs about 3.4 cans.

A worked example

A neutered 4 kg cat eats a wet food that comes in 85 g cans with 75 kcal each.

Daily calories: 238 kcal.
Cans: 238 ÷ 75 ≈ 3.2 cans a day, about 270 g.
Four meals: about 0.8 can each, or 68 g.
Treats: no more than about 24 kcal; subtract them from the meals.
Cans a month: about 3.2 × 30 ≈ 95 cans.

The monthly figure helps with budgeting, and the Cat Food Cost Calculator turns the calories and the price into cost per day and per month.

Mixing wet and dry

Mixed feeding is very common. The easiest approach is to choose the share of calories that comes from wet food, then convert each share:

Share of calories from wet	4 kg cat: wet food	4 kg cat: dry food (3,800 kcal/kg)
100%	238 g	0 g
75%	179 g	16 g
50%	119 g	31 g
25%	60 g	47 g
0%	0 g	63 g

Notice that moving from all wet to half wet reduces the wet portion by half, and adds only 31 g of dry food. People often add a full portion of each and end up with double the calories. Our cat feeding chart by weight lists the numbers for other weights.

Meals and freshness

Number of meals. Two to four a day suits most cats; some prefer more small meals.
Fridge storage. Cover opened cans and keep them cold; bring to room temperature before serving if your cat prefers it.
Uneaten food. Wet food left out for a long time becomes unappetising and less safe, so discard leftovers after a short time, as the manufacturer advises.
Bowls. Wash daily. Some cats dislike deep or narrow bowls.
Water. Always offer fresh water, even if the cat eats wet food.

Treats and extras on a wet diet

Treats still count. The usual limit is 10% of daily calories (WSAVA and AAHA), about 24 kcal for a 4 kg cat. Lickable treats, toppers and food used to hide medicines count too, so subtract them from the wet portion. The Cat Treat Calorie Calculator shows how many fit.

Should a cat eat only wet food?

Many cats thrive on wet food, mixed feeding or dry food, as long as the food is complete and balanced and the calories are controlled. Wet food provides a lot of water, which some owners value, and it is easy to portion by can. It is also more expensive per calorie than most dry foods. The right choice depends on your cat’s health, preferences and your budget, and your vet can advise on special needs such as urinary or kidney conditions.

Common mistakes

Feeding “a can” without checking its calories.
Adding a full portion of dry food to a full portion of wet.
Forgetting that a can’s kcal differ between brands and flavours.
Leaving food out for hours.
Using the same amount as the cat grows or loses weight.
Making sudden changes in diet.

Wet food costs, per day and per month

Wet food is usually more expensive per calorie than dry, so it helps to know what a day costs. The sum is: cost per day = cans per day × price per can. The numbers are illustrations.

Cat	Calories	Cans of 85 kcal	At 0.80 a can	At 1.20 a can
3 kg	191	2.2	1.80 a day (54 a month)	2.70 a day (81 a month)
4 kg	238	2.8	2.24 a day (67 a month)	3.36 a day (101 a month)
5 kg	281	3.3	2.64 a day (79 a month)	3.96 a day (119 a month)

A difference of 0.40 a can becomes more than 30 a month for a 4 kg cat. If you feed a mix, the wet share of the calories drives the cost. The Cat Food Cost Calculator works out the cost from your own prices and calories.

Tins, pouches, trays and sachets

Wet food is sold in several packs, with different sizes and calories:

Pack	Typical size	Notes
Can or tin	80 to 400 g	Larger cans need covering and refrigerating after opening
Pouch or sachet	70 to 100 g	Easy to portion, more packaging
Tray	85 to 100 g	Easy to serve; check the calories
Multi-serve pot	Varies	Portion carefully

The key is to read the calories on your pack, not the size of the pack. A 100 g pouch with 70 kcal and a 85 g can with 85 kcal are different. If a pack is not used in one meal, store the rest in a covered container in the fridge and use it within the time the maker states.

A day on a wet-only diet

For a 4 kg neutered cat on a food of 1,000 kcal per kg, 238 g a day, four small meals look like this:

Time	Meal	Amount
7 am	Breakfast	60 g
12 pm	Lunch	60 g
5 pm	Dinner	60 g
10 pm	Late meal	58 g

If you are out all day, an automatic feeder with ice packs for wet food can help, or ask someone to serve a midday meal. Do not leave wet food out for hours.

A neutered 4 kg cat needs about 238 kcal. A sample day of mixed feeding:

Meal	Food	Amount	kcal
Morning	Wet pâté at 1.0 kcal/g	100 g	100
Midday	Dry food at 3.6 kcal/g	20 g	72
Evening	Wet pâté at 1.0 kcal/g	60 g	60
Treats	Small pieces		6
Total			238

Mixing changes the grams but not the calories, so always recalculate when you change brand. Opened cans should be covered and kept in the fridge, and the label will say for how long. Ask your vet about the right balance for your cat.

Storing and serving wet food

Cover opened cans and keep them in the fridge for the time on the label. Serve at room temperature, since many cats dislike food straight from the fridge, and remove uneaten food after the period the label recommends. Wash bowls after every meal, because wet food spoils faster than dry, and use a shallow dish to avoid whisker discomfort.

Quick summary

Wet food grams = daily calories ÷ kcal per gram.
A neutered 4 kg cat needs about 238 kcal: about 238 g of a 1,000 kcal/kg food, or 2.8 cans of 85 kcal.
If a label lists kcal per can, divide the calories by it to get cans a day.
For mixed feeding, split calories first, then convert each share.
Keep treats under 10% of daily calories and never leave wet food out for long.
Use the Cat Food Cans per Day Calculator with your can’s numbers.

Frequently asked questions

How much wet food should a cat eat a day?

Calories divided by kcal per gram. A neutered 4 kg cat needs about 238 kcal, so about 238 g of a 1,000 kcal/kg food, nearly 3 cans of 85 g.

How many cans of cat food a day?

Divide the daily calories by kcal per can. A 4 kg neutered cat needs 238 kcal, so with 85 kcal per can that is about 2.8 cans.

Can I feed only wet food?

Many cats do well on wet food alone if it is complete and balanced for their life stage. Ask your vet if you are unsure.

How do I mix wet food with dry food?

Split the day's calories between them, then convert each share to grams. If half the calories are wet, a 4 kg cat gets about 119 g of wet food.

How often should I feed wet food?

Two to four meals a day is common. Keep the daily total the same and discard uneaten wet food after a short time.

Is the calorie content the same for all wet foods?

No. Some are around 700 or 800 kcal per kg and some more than 1,000, so read the label.

How many treats can a cat have on a wet diet?

No more than about 10% of daily calories, which is about 24 kcal for a 4 kg cat.

Sources

Reviewed by the CalcuPaw Veterinary Review Team

Last reviewed 18 Oct 2026 · Meet the review team · This guide is general information, not veterinary advice.