How Much Should a Kitten Eat? By Age

Quick answer Kittens use about 2.5 times the resting energy requirement (70 × kg^0.75), far more per kilogram than adult cats. A 1.5 kg kitten needs about 237 kcal a day, which is roughly 59 g of a 4,000 kcal/kg dry food or 237 g of a 1,000 kcal/kg wet food, spread over 3 to 4 meals.

A kitten is growing at a speed that adult cats never match, and its appetite shows it. Pound for pound, a kitten eats far more than an adult cat. This guide explains how much a kitten should eat by weight, how to convert calories into grams of wet and dry food, how many meals a day suit a growing kitten, what to do about weaning, and when to move on to adult food.

Why kittens need so much energy

A kitten spends energy on normal activity and on building a body: bone, muscle and organs. The NRC, Merck and WSAVA tables give a kitten a factor of 2.5 times the resting energy requirement (RER), compared with 1.2 for a neutered adult cat. RER itself is:

RER (kcal/day) = 70 × weight in kg ^ 0.75

So the daily energy for a kitten is:

kitten energy = 2.5 × 70 × weight in kg ^ 0.75

The factor describes an average kitten. Some are more active than others, and body condition and weight gain are better guides than the arithmetic alone.

Kitten calories and grams by weight

Kitten weight	Daily energy	Dry food only (4,000 kcal/kg)	Wet food only (1,000 kcal/kg)
0.5 kg (1.1 lb)	104 kcal	26 g	104 g
1 kg (2.2 lb)	175 kcal	44 g	175 g
1.5 kg (3.3 lb)	237 kcal	59 g	237 g
2 kg (4.4 lb)	294 kcal	74 g	294 g
3 kg (6.6 lb)	399 kcal	100 g	399 g
4 kg (8.8 lb)	495 kcal	124 g	495 g

The dry and wet columns assume foods of 4,000 and 1,000 kcal per kg; your kitten food will differ. If you feed both, split the calories between them first and then convert each share to grams. The Kitten Food Calculator takes your own weight, age and food energy.

A worked example

A 10-week-old kitten weighs 1.5 kg and eats a kitten food that lists 4,000 kcal/kg.

RER = 70 × 1.5 ^ 0.75 ≈ 95 kcal.
Kitten energy = 2.5 × 95 ≈ 237 kcal a day.
Dry food = 237 ÷ 4.0 ≈ 59 g a day.
Divided over four meals, each is about 15 g.

Two weeks later the kitten may weigh 1.9 kg, and the daily amount rises to about 280 kcal. Weigh weekly and recalculate rather than keeping one amount for the whole of kittenhood.

Weaning and very young kittens

Kittens under four weeks old drink their mother’s milk or a suitable milk replacer, and they need a feeding plan from your vet. For this reason the calculator does not give amounts for kittens under four weeks. Weaning onto solid food is gradual, and it usually begins when kittens show interest in the mother’s food. Offer a soft, moistened kitten food in a shallow dish and let the kitten explore. If you have an orphaned kitten, a vet check on day one is essential.

If the kittens were born at home, our guide to how long cats are pregnant explains the timeline and what to prepare before the birth, and it links to the kitten care points that follow.

How many meals a day?

Young kittens have small stomachs and need frequent meals. The calculator suggests 3 to 4 meals a day. Younger kittens often take four or more, and many owners drop to three as the kitten grows. Practical points:

Divide the daily total into equal portions in advance.
Keep meal times regular.
Remove uneaten wet food after a short time; fresh food is safer and more appealing.
Always have fresh water out.

Ask your vet if you are unsure about your kitten’s schedule, especially for very small or underweight kittens.

Wet, dry or mixed?

Both can work for kittens if they are labelled complete and balanced for growth. Some points to bear in mind:

Wet food is easy to eat for small kittens and has a high water content, but it is low in calories per gram, so portions look large.
Dry food is calorie-dense, so portions look small and are easy to overfeed.
Mixed feeding is common; calculate calories for each food separately, as in our guide to how much to feed an adult cat.

For wet food in cans or pouches, the Cat Food Cans per Day Calculator converts calories into cans.

Choosing a kitten food

Choose a food labelled for growth (kitten) or “all life stages”, and check that it states it is complete and balanced. Ask your vet for a recommendation; they know your kitten’s age, breed and any health conditions. Avoid changing foods repeatedly, because frequent switches upset the stomach and can create fussiness. When you do change, mix a little of the new food into the old and increase it over about a week.

Treats and extras

Kittens do not need treats, but they are useful for play and training. WSAVA and AAHA suggest treats stay below 10% of the day’s calories. For the 1.5 kg kitten above, that is roughly 24 kcal. Use tiny pieces and reduce meals slightly. The Cat Treat Calorie Calculator shows how many treats fit the allowance. Do not give milk or table scraps as a substitute for kitten food.

When to switch to adult food

Growth slows as the kitten approaches adult size, and the energy factor falls from 2.5 towards the adult factor (1.2 for a neutered cat). AAFP/AAHA’s life stage guidelines treat a cat as a kitten until about one year of age, though some larger breeds mature later. A sensible plan:

Ask your vet when to move to adult food, which depends on your kitten’s size, breed and neutering status.
Switch gradually over about a week.
Recalculate calories using the adult factor and the cat’s adult weight; see how much to feed a cat.
Keep monitoring weight and body condition, because many cats gain weight after neutering.

Our cat years to human years chart shows how the first year of a cat’s life maps onto human ages and life stages.

Checking that growth is on track

A healthy kitten:

Gains weight steadily week by week.
Has a bright coat, clear eyes and plenty of energy.
Has firm stools and a good appetite.
Feels solid, with ribs that can be felt but are not sharply visible.

Keep a simple weight record with the date and weight, weekly in the first months. If your kitten loses weight, stops eating, seems lethargic or has persistent diarrhoea or vomiting, contact your vet promptly, because kittens can deteriorate quickly.

Common kitten feeding mistakes

Using the adult cat amount, which underfeeds a growing kitten.
Using the kitten amount for an adult, which overfeeds.
Free-feeding without tracking the daily total.
Forgetting to recalculate as weight rises.
Changing foods suddenly.
Giving cow’s milk, which many cats digest poorly.
Ignoring the 10% treat limit.

The first week at home

A new kitten is excited and sometimes stressed, which can affect appetite for a day or two. Help it settle:

Give a quiet room with food, water, a litter tray and a bed.
Keep the food the kitten was eating at the breeder or rescue for at least the first days.
Offer meals at regular times, and stay nearby to see how much the kitten eats.
Change food only gradually, once the kitten has settled.
Book a vet visit for a first check, and bring any feeding notes from the previous home.

A kitten that refuses food for more than a day, or seems weak or unwell, needs to be seen by a vet promptly.

Weighing and recording growth

Kittens are small enough to weigh on kitchen scales in a shallow box. Weigh weekly at the same time of day and write it down. In the first months, weight rises steadily, and a record lets you spot slow gains early.

Date	Age in weeks	Weight	Daily calories (2.5 × RER)	Meals

Recalculating calories each week keeps the plan in step with growth. The Puppy & Kitten Age Calculator shows age in weeks from a birth date.

Fussy kittens

Fussiness is common in young kittens. Before changing anything:

Check that the food is fresh and at room temperature, since cold wet food can be unappealing.
Try a shallow dish, because some kittens dislike deep bowls.
Make sure the amount offered is not larger than the kitten needs, since a full kitten refuses food.
Reduce treats and snacks.

If a kitten is lively, gaining weight and eating something, a short fussy phase is usually not a worry. If it is also quiet, losing weight or has diarrhoea or vomiting, call your vet.

Feeding kittens from the same litter

Litter-mates often eat at different speeds, and the faster ones can take more. Feed from separate bowls, space them apart and watch that each kitten finishes its own food. Weigh each kitten individually to catch the one that is falling behind. When kittens leave the litter, it helps to ask the breeder or rescue for details of the food and meal times.

A simple timeline

Age	What usually happens	What to do
Under 4 weeks	Nursing or bottle-fed	Follow your vet’s plan
About 4 weeks	Weaning begins	Offer moistened kitten food in a shallow dish
8 to 12 weeks	Independent eating, often four meals	Weigh weekly, recalculate calories
3 to 6 months	Rapid growth continues	Three to four meals, adjust to weight
6 to 12 months	Growth slows	Ask your vet about moving to adult food
About 1 year	Adult life stage	Switch gradually and use the adult factor

The timeline is a rough guide, since kittens develop at different rates and breeds mature at different ages. If you have the mother cat as well, the cat pregnancy guide explains what to expect before the birth.

Quick summary

Kittens need about 2.5 × RER, where RER = 70 × kg ^ 0.75.
A 1.5 kg kitten needs about 237 kcal: about 59 g of 4,000 kcal/kg dry food or 237 g of 1,000 kcal/kg wet food.
Feed 3 to 4 meals a day and recalculate as the kitten grows.
Kittens under four weeks need a plan from your vet.
Keep treats under 10% of calories and switch to adult food gradually.
Use the Kitten Food Calculator for your kitten’s numbers.

Frequently asked questions

How much should a kitten eat a day?

About 2.5 × 70 × weight in kg ^ 0.75 kcal. A 1.5 kg kitten needs about 237 kcal a day. Convert to grams using the kcal per kg on the food.

How many times a day should kittens eat?

The CalcuPaw kitten calculator suggests 3 to 4 meals a day. Very young kittens may need more, and your vet will advise on your kitten's age and health.

How much wet food should a kitten eat?

At 1,000 kcal/kg, a 1.5 kg kitten needs about 237 g of wet food a day if wet food is the only food. Wet foods differ, so read the label.

What about kittens under four weeks old?

Kittens under 4 weeks are nursing or bottle-fed and need a feeding plan from your vet. The calculator does not give amounts for them.

When should I switch from kitten food to adult food?

Kittens usually move to adult food as growth finishes, often around a year of age. Ask your vet to confirm for your kitten and switch gradually over about a week.

Can I free-feed a kitten?

Some kittens manage it, but free-feeding makes it hard to track intake and can lead to overeating. Planned meals with a daily total are easier to adjust.

Do kittens need treats?

They do not need them, but small treats can help training and bonding. Keep treats under 10% of daily calories and reduce meals to match.

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.