Why switch a cat to wet food at all?

Water. Wet food is mostly water, kibble is mostly not, and many cats drink too little to make up the difference; more water in the food means more dilute urine, which vets like for the bladder and kidneys. Wet food is also easier on old teeth and harder to overeat. Kibble wins on price and convenience, which is why half and half is a common landing point.

How long does it take to switch a cat to wet food?

Ten days for a cat that goes along with it, three weeks for one that does not. The steps are the same: a quarter of the calories as wet food, then half, then three quarters, then all, each held for two or three days, or longer if the cat is picking round the new food.

What if my cat refuses the wet food?

Go back to the last mix the cat ate, and try the wet food slightly warmed, in a shallow dish, at the meal the cat is hungriest. Never leave a cat unfed to force the point: an overweight cat that eats nothing for a day or two can develop hepatic lipidosis, a liver failure. A cat that has eaten nothing for 24 hours needs the old food back and a call to the vet.

How many pouches a day for a cat?

2.5 pouches of 90 kcal for a 4 kg indoor cat on wet food alone, 2.7 for a 5 kg cat; at half and half it is 1.3 pouches plus 30 g of kibble for the 4 kg cat. Pouches labelled 70 or 110 kcal change the count in proportion.

Does wet food cost more?

Per calorie, several times more: the cost guide puts a 3,800 kcal/kg kibble at 6 per kg against 90 kcal pouches at 0.70 and the pouches come out about five times dearer per 1,000 kcal. Half and half splits the difference and keeps most of the water benefit.

Switching a cat from dry to wet food: a 10-day plan with the pouches

Published 2026-09-17 · 5 min read

A 4 kg (8.8 lb) indoor cat needs about 226 kcal a day: 60 g of a 3,800 kcal/kg kibble, or 2.5 pouches of 90 kcal, or half and half at 1.3 pouches plus 30 g. Cats resist new food more than dogs and pay a higher price for skipping meals, so the switch below takes ten days, moves a quarter at a time, and stops wherever you want it to: at half wet, or all the way.

Cat food calculator

Why not all at once

Cats decide what food is in the first months of life and treat anything new with suspicion; a sudden change is the most common reason a cat stops eating. A cat that stops eating, especially an overweight one, risks hepatic lipidosis within days, which is the reason every step here is small and every step is optional. The calories never change; only the share that comes from the pouch does.

The 10-day plan for a 4 kg cat

226 kcal a day throughout, in three meals. Pouches are 85 g at 90 kcal, kibble 3,800 kcal/kg. Serve the pouch and the kibble in the same bowl for the first days, then separately if the cat prefers.

Pouches and grams per day during a 10-day switch (4 kg indoor cat)
Day	Wet share	Pouches a day	Kibble (g)	Per meal (3 meals)
Day 1	25% wet	0.6	45	0.21 pouch + 15 g
Day 2	25% wet	0.6	45	0.21 pouch + 15 g
Day 3	50% wet	1.3	30	0.42 pouch + 10 g
Day 4	50% wet	1.3	30	0.42 pouch + 10 g
Day 5	50% wet	1.3	30	0.42 pouch + 10 g
Day 6	75% wet	1.9	15	0.63 pouch + 5 g
Day 7	75% wet	1.9	15	0.63 pouch + 5 g
Day 8	75% wet	1.9	15	0.63 pouch + 5 g
Day 9	100% wet	2.5	0	0.84 pouch + 0 g
Day 10	100% wet	2.5	0	0.84 pouch + 0 g

Stopping at day 5 leaves the cat on half and half, a good permanent arrangement; days 6 to 10 finish the move to wet food only.

By weight

Daily portion on kibble only, half and half, and pouches only (indoor line)
Cat weight	Calories	Kibble only (g)	Half and half	Pouches only
3 kg (6.6 lb)	202	53	1.1 + 27 g	2.2
4 kg (8.8 lb)	226	60	1.3 + 30 g	2.5
5 kg (11 lb)	247	65	1.4 + 33 g	2.7
6 kg (13.2 lb)	266	70	1.5 + 35 g	3

What helps

Warm the wet food to about body temperature (a few seconds, and stir so there are no hot spots); it smells more and cats eat with their nose. Offer the new mix at the hungriest meal, usually the first of the day. Use a shallow, wide dish so whiskers do not touch the sides. Take away what is not eaten within an hour rather than leaving wet food out. Do not switch brand of kibble and add wet food in the same week; one change at a time.

After the switch

Weigh the cat after four weeks. Wet food is harder to overfeed than a bottomless bowl of kibble, so a cat that was creeping up in weight often stops; a cat that has lost weight it did not need to lose gets one more pouch a week until it stabilises. The cat food calculator gives pouches and grams for any wet share and your own foods; how much wet food to feed a cat has the tables for 70 to 110 kcal pouches, and how much it costs to feed a cat per month shows what the change does to the bill.

Frequently asked questions

Why switch a cat to wet food at all?: Water. Wet food is mostly water, kibble is mostly not, and many cats drink too little to make up the difference; more water in the food means more dilute urine, which vets like for the bladder and kidneys. Wet food is also easier on old teeth and harder to overeat. Kibble wins on price and convenience, which is why half and half is a common landing point.
How long does it take to switch a cat to wet food?: Ten days for a cat that goes along with it, three weeks for one that does not. The steps are the same: a quarter of the calories as wet food, then half, then three quarters, then all, each held for two or three days, or longer if the cat is picking round the new food.
What if my cat refuses the wet food?: Go back to the last mix the cat ate, and try the wet food slightly warmed, in a shallow dish, at the meal the cat is hungriest. Never leave a cat unfed to force the point: an overweight cat that eats nothing for a day or two can develop hepatic lipidosis, a liver failure. A cat that has eaten nothing for 24 hours needs the old food back and a call to the vet.
How many pouches a day for a cat?: 2.5 pouches of 90 kcal for a 4 kg indoor cat on wet food alone, 2.7 for a 5 kg cat; at half and half it is 1.3 pouches plus 30 g of kibble for the 4 kg cat. Pouches labelled 70 or 110 kcal change the count in proportion.
Does wet food cost more?: Per calorie, several times more: the cost guide puts a 3,800 kcal/kg kibble at 6 per kg against 90 kcal pouches at 0.70 and the pouches come out about five times dearer per 1,000 kcal. Half and half splits the difference and keeps most of the water benefit.

Figures come from the calculators on this site and the published feeding equations (NRC 2006, WSAVA, AAHA). Individual animals vary by up to 30%: adjust by body condition, and ask your vet before changing the diet of a puppy or kitten, a pregnant or nursing animal, or one with an illness.