How Much to Feed a Cat

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how much to feed a cat

Kate Barrington /

As with all carers of animals, one of the basic questions that we need to answer every day for our cats is: “how much should I feed my cat?”

This article will help you discover how much food you should be feeding, so that you can ensure that your cat stays at their optimal body weight.

Firstly, What Type of Food Should Cats Eat?

What to Feed a Cat

It’s critical to feed your cat a nutritionally complete and balanced diet that contains all of the nutrients your cat needs to thrive.

You can meet a healthy cat’s nutritional needs met by feeding the right amount of the right type of food every day.  This diet should give your cat the correct quantities of carbohydrates, fats, minerals, vitamins and proteins/ amino acids, including essential nutrients like taurine.

The easiest way to do this is to use a nutritionally balanced complete commercial pet food, whether wet cat food (canned cat food) or dry cat food (kibble) or a mixture of the two types.

Good quality food should be fed in the right quantities, with other aspects (like grain-free or specific ingredients) being far less important than many owners may believe.

Cat treats can also be offered, in limited quantities. Fresh water, of course, is calorie-free and should always be available to cats. A cat’s litter box should be monitored by cat carers. Normal feces is an important guide to the suitability of a diet to an individual cat.

The daily food offered to a cat is an important contributor to their overall health.

Why Is It So Common for Cats To Become Overweight or Obese?

Overweight Cat How Much to Feed a Cat

An estimated 50% of cats over the age of five carry too much bodyweight, making them either overweight or obese. Too much food is the main contributor to excessive bodyweight, so it’s essential to make sure your cat is eating the right amount.

It has become increasingly common for pet cats to become overweight or obese, with estimates that around 50% of cats over the age of five years carry too much body weight. Cat carers are often not aware that their pets are overweight or obese, yet an overweight cat is more likely to suffer health issues such as diabetes, heart disease, arthritis, kidney disease, and a shorter life span.

The most common reason for cats becoming overweight or obese is simply that cat carers offer their cat more food than their cat needs.

That’s why it’s so important to know how much food you should offer your cat every day, so that your cat avoids preventable health problems later in life.

Cats, just like humans, enjoy eating: it’s one of the great pleasures of life, and a cat’s diet is one of the most important parts of their day. And because cat carers like to make their pets happy, it’s all too easy to want to give them extra food, to give them even more enjoyment in life.

Also Read: The 10 Best Cat Foods

However, we all need to step back and recognise that while feeding a pet makes them happy in the immediate moment, if we give them too much food, the excessive food intake causes serious discomfort, poor health, and a shorter life in the long term.

So if we genuinely care about helping them achieve their best possible lives, we should be disciplined about how much food we feed them so that they stay at a healthy weight.

What Sort of System Should I Use for Feeding My Cat?

How to Choose a System for Feeding Your Cat

The way you feed your cat can be almost as important as how much you feed them.

In the past, many people have given their cats free choice , free-feeding, or ad libitum i.e. offering them as much in their food bowl as they wish to eat. In particular, a bowl of dry food (kibble) has often been continually topped up, allowing the cat to eat this whenever they wish to do so.

It is now recognised that feeding cats using this method is likely to lead to cats eating too much, leading them to be overweight or obese. Instead, cat carers should calculate the correct daily amount to feed, and either weigh this amount daily, or use a feeding container to give the measured amount every day as their cat’s food supply.

Whichever method is used to calculate how much a cat should be fed, it is impossible to generalize for every individual cat, because of several variables that are not the same between different animals.

The first three variables can be factored into calculations:

  • Age: growing animals need more food, and the precise quantity varies depending on how fast that cat is growing. Meanwhile, older cats (senior cats) tend to be less active, with reduced energy needs.
  • Size: larger animals have higher daily energy needs compared to smaller animals.
  • Neutered status: if a cat has been spayed or neutered, then they generally have lower energy needs than entire animals.Other significant variables between animals that are more difficult to specify include:
  • Activity level: outdoor cats spend more time moving than indoor cats, so they need more energy. As well as this broad difference, individual cats, whether indoor or outdoor, have different levels of activity that can be hard to monitor or calculate.
  • Metabolic rate: some individual cats have a faster resting metabolic rate than other cats, meaning that they need more food than others to supply their basic energy needs every day. Again, this is not something that can be easily calculated by owners.

Here’s How To Start To Work Out How Much To Feed.

How to Calculate How Much to Feed Your Cat

Several factors go into determining how much your cat needs to eat.

The starting point is to establish five facts about your cat.

  1. How old are they?
  2. How much do they weigh currently?
  3. Are they neutered or entire?
  4. Are they active (e.g. outdoor) or inactive (e.g. indoor)?
  5. Are they currently the correct weight, are they underweight, or overweight? Please read our article on body condition score to discover this important fact about your own cat.These five facts are used to help to work out how much to feed, using one of several different possible methods.You also need to note what type of food you are using, and get a notebook to record how much food you feed every day, recording the number of sachets of most food (or tins of canned food), and the weight, in grams, of dry cat food.

You Can Also Calculate How Much To Feed Your Cat by Reading the Label

A Devon Rex cat enjoying a meal.

Cats, just like humans, enjoy eating: it’s one of the great pleasures of life, and a cat’s diet is one of the most important parts of their day.

Most commercial pet foods include a guide to feeding quantities on the label of the packaging. Typically there is a chart, with the cat’s weight in the left column, and the recommended amount of food in the right column e.g 8.8lbs (4kg) and 2.3 ounces (65g) for dry food, or 8.8lbs (4kg) and 2 sachets or pouches for wet food, or a mixture, such as 1 ounce (28g) dry food plus one sachet of wet food.

Some people prefer to work with volumes (e.g. cups) rather than absolute weights, but the challenge is that dry food varies in density, so it’s better to work with weight on the first occasion, but place the volume of food in the container of your choice (e.g. a plastic cup) and draw a line with a permanent marker so that you can see how much volume this makes. Then on future occasions, you can simply use the plastic cup, up to your line, as a daily guide.

Sometimes there are different recommendations for active (outdoor) and inactive (indoor) cats, neutered or entire cats, and for cats that are obese, overweight, or at their correct body weight.

These recommended amounts represent the manufacturer’s calculation of the correct amount of daily food for an average cat.

Often, a range of recommended quantities is given, rather than a single specified amount. This is recognition of the fact that it is impossible to say precisely how much any individual cat should be fed: there is always variation based on a number of factors.

There is an untrue myth that pet food manufacturers deliberately overstate the recommended feeding amounts on the label in an attempt to make people use more pet food. In fact, the recommended feeding amounts do represent a reasonable estimate that is useful for many cat owners who may not be able to calculate correct feeding quantities using other methods.

How Much To Feed a Cat by Age?

Cat looking and eating.

There is an untrue myth that pet food manufacturers deliberately overstate the recommended feeding amounts on the label in an attempt to make people use more pet food.

Growing kittens need comparatively more food than adult cats, because they need nutrients to allow their body to grow. This can be difficult to calculate precisely, and professional veterinary nutritionists have charts and guides that may be applied.

For most cat carers, it is simpler to recognise that kittens do have higher requirements, and that it is rare for kittens to become overweight or obese. Using the broad guidelines on the packaging, it is fairly safe to say that kittens can be fed almost as much food as they wish to eat at each mealtime, within reasonable limits.

  • If the kitten is still chasing the bowl, looking for more food when they have finished, they should be offered a little more.
  • If the kitten routinely does not finish the food that is offered in the bowl, they should be offered less the next time.

How Much To Feed a Cat by Weight?

Two adorable kittens eating together.

The recommended daily caloric intake can be calculated using a formula to work out the Resting energy requirement (RER)

Once a cat has passed kittenhood, and has stopped growing, it is possible to work out how much to feed based on their body weight. The recommended daily caloric intake can be calculated using a formula to work out the resting energy requirement (RER):

RER=70 x (body weight in kg) to the power of 0.75 or 70 x (weight in kg ^ 0.75)

To work out the “to the power of 0.75” part of the equation, you can either use a calculator that allow you to use exponents,  or you can multiply the weight in kilograms by itself 3 times (e.g. 4x4x4 for a 4kg cat), then work out the square root of that sum, twice.

This calculation will give you the resting energy requirement for your cat in kilocalories. You then need to multiply this by a different factor depending on your individual cat to estimate their total daily energy needs, with possible variables listed below.

How Much To Feed a Cat Chart

Cat enjoying a meal.

Neutered adult cat 1.6 x RER
Entire adult cat 1.8 x RER
Inactive adult cat 1.2-1.4 x RER
Cat aiming to lose weight 1.0 x RER for ideal weight
Cat trying to gain weight 1.2-1.8 x RER for ideal weight
Very active outdoor cat 2.0-4.0 x RER

You should remember that an individual cat’s needs may vary by as much as 50% from these calculated values, and that it is always necessary to modify feeding quantities depending on  how a cat’s body weight changes over time.

Once the daily recommended number of kilocalories has been calculated, you then need to discover how many kilocalories are in the food that you are offering. This depends on the ingredients in the food. You can usually discover this, if not on the food label, by visiting the pet food manufacturer’s website, or by contacting them directly.

This method will allow you to calculate for yourself, from first principles,  approximately how much food you should be feeding your cat.

For many people, this type of calculation is too complex, and they prefer to simply follow the manufacturer’s guide on the label, modifying this over time depending on how their pet’s body weight changes.

Cat Feeding Schedule

Cat eating dry food.

Cats in the wild are hunting carnivores, consuming small meals frequently as they catch small prey throughout the day. Ideally, a feeding regime at home should follow the same pattern, with smaller meals being offered more frequently, e.g. four times daily.

Also Read: The Complete Feeding Guide From Kittens To Seniors

Many people, for reasons of convenience, feed their cats less often, but the frequency should never be less than twice daily e.g. morning and evening.


Cat growling while eating.

The exact quantity of food fed every day is an important variable to ensure long term feline health. It’s important to record how much food is fed every day, and to monitor your cat’s body condition every month. Weight gain, or weight loss, can then be monitored. If your cat starts to become overweight, you need to feed less food every day, and if they start to become underweight, you need to offer more food every day.

Ideally, you should weigh your cat every month to monitor how their body weight changes: you can do this using electronic scales (e.g. at your local veterinarian’s office) or you can stand on your own bathroom scales holding your cat, then weigh yourself afterwards to work out the difference.

Frequently Asked Questions About How Much to Feed a Cat

How much should you feed your indoor cat?

Indoor cats are generally less active than outdoor cats, so they burn up less energy, and require a lower number of kilocalories in their daily food. Indoor cats should be fed the lower level of recommended quantity on recommended levels on food packaging.

How much dry food should I feed my cat?

You should use the guidelines on the label on the food packaging as a starting point, offering your cat more or less over time, depending on their body weight. If your cat is becoming overweight, you should feed less, and if they seem underweight, you should offer more.

Why are my cats so hungry all the time?

If cats become used to being fed too much food, it can be difficult for them to get used to a restricted amount of feeding. Cats enjoy the act of eating, just like humans, and so you need to find ways to give them enjoyment in different forms, such as getting new toys to play with, or simply by engaging with them more as their carer.

Over time, most cats learn to adapt to the new way of feeding, and they become less hungry. If your cat does continue to seem hungry all the time, you should take them to your DVM veterinarian for a health check in case there is an underlying health reason for this (such as hyperthyroidism). If it turns out that your cat is in full health, but simply very hungry despite being fed the correct amount of food, your veterinarian may be able to suggest a type of high quality cat food that is more likely to make your cat feed full (satiated).

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About Dr. Pete Wedderburn, DVM

Dr Pete Wedderburn qualified as a vet from Edinburgh in 1985 and has run his own 4-veterinarian companion animal practice in County Wicklow, Ireland, since 1991. Pete is well known as a media veterinarian with regular national tv, radio and newspaper slots, including a weekly column in the Daily Telegraph since 2007. Pete is known as "Pete the Vet" on his busy Facebook, Instagram and Twitter pages, regularly posting information on topical subjects and real-life cases from his clinic. He also write a regular blog at His latest book: “Pet Subjects”, was published by Aurum Press in 2017.

13 thoughts on “How Much to Feed a Cat”

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  1. Hamza

    Hello Pete Wedderburn,
    First of all, thanks for sharing such a wonderful information with us. I’ve read your complete Bio and I think you must have answer to my question.
    Please tell me which food I should feed to my cat, the age of the cat is 11 years.
    I’ve heard that dry cat food is not good for older cats.

    Please let me know the answer in details, as I’m planning to write a complete details about wet and dry cat food for different cat age groups.


    1. small mallory photoMallory Crusta

      Hello Hamza, thank you for commenting!

      If you have any further questions specific to your situation, I’ll happily forward them to Dr. Pete Wedderburn.
      For now, however, I believe we already have a couple of articles that should give you the information you need. You can start with our article on The Best Cat Food for Senior Cats. Secondly, our veterinarian-reviewed Cat Feeding Guide breaks down how much to feed a cat at all life stages.
      Again, please let me know if you have further questions for Dr. Wedderburn and I’ll pass them on.

  2. Misha

    Hi, thank you so much for this article! I was wondering how I should measure my cats food if I feed them a mix of wet and dry food?

    1. small mallory photoMallory Crusta

      Hi Misha, you don’t have to measure your cat’s food, but doing so is a great way to control their calorie intake and be sure that they’re getting the appropriate amount for their size. Remember that the calories in dry food add up very quickly, so you could easily go overboard with a combination of both. Hope this helps! – Mallory

  3. Erin

    Hi there, the formula for calculating RER / calorie intake is written ambiguously. Is it supposed to be:
    A. 70 x (weight in kg ^ 0.75)
    B. (70 x weight in kg) ^ 0.75
    These result in pretty massively different numbers, and with no reference values to compare against, it’s impossible to tell which one is the intended result.


  4. Romane

    Hello Dr!
    I’ve been wanting to do this calculation for a while, my cat is 9kg and approaching 10 y-o (we’re not responsible for his weight he was from a multiple cat household and ate all the other cat’s food) I was just wondering if the cat’s size (lenght/height) mattered? Thanks in advance 🙂

    1. small mallory photoMallory Crusta

      Hi Romane, yes—an individual cat’s build does play a part in how much they need to eat and what constitutes a healthy weight for them. That’s why people will generally use a body composition chart when making this calculation. You might appreciate our cat weight calculator (it also tells you how much your cat needs to eat to reach their goal weight).

  5. Angela

    I have an 8-years old can who is a rescue. He is somewhat of a Jekal and Hyde animal, quite unpredictable. He will be nuzeling around my legs quite frequently and also sleeps quite a lot during the day. If I pet him when he is lying down after he has finished a sleep, he will ‘attack’ me and go away from me. He goes in and out quite frequently during the day obviously when I am at home (I prefer to leave him indoors with a bit of food if I am going out for the day). As soon as I am home, night or day, I let him go outside for a while. I love him but I don’t think he loves me. I have no idea what his previous home was like. He is definitely not a lap cat. I am wondering if a female cat would be a bit more agreeable. It would be a shame if I got rid of him and he became a ‘rescue’ once again, but as I live alone I would like a more affectionate animal. He doesn’t play with toys. I was brought up on a farm so I love all animals. However, in those days, back in the 1940’s, most of the animals had to earn their keep. Cats catching mice and rats – dogs attending to the sheep when necessary, etc.. I came to London in 1946 and had several loving cats over the following years. Any suggestions pm how to better manage Finch would be most appreciated.

    1. small mallory photoMallory Crusta

      Hi Angela, apologies for the late reply! Hope all is well. Your new cat seems like a very independent kitty. Sensitivity around petting is normal for a lot of cats, especially those who weren’t well-socialized in their earlier life. It may take some more time for him to become more comfortable with you, and you may need to learn to understand the ways in which he is affectionate. Rubbing against your legs shows that your cat regards you as part of his home territory, which is a part of bonding. You may find that he doesn’t like to be petted after a nap, but does like to be rubbed on the face in the same places that he uses to nuzzle you. Perhaps you can develop a less physical bond, enjoying his personality and learning each other’s schedules. Adopting a second cat might be risky given that he’s an older cat and may be set in his ways, but you could consider adopting a kitten who you can socialize and “mold” a bit more. Caring for two cats at once shouldn’t be much more demanding than one, so I don’t think you need to “replace” him. Additionally, I wouldn’t assume that a female cat will be more friendly, but a kitten most likely would be more moldable. Hope this helps!

  6. Simm Gottesman

    Don’t really know how old our cat Ella Boop really is – but she is spayed & you only mention neutered – but assume you mean both – she is maybe part Bengal or full Bengal & seems very smart & I was inspired to ask you for advice – because of your kind answers above – to others who asked about their cats – I was told that because she looks like she is part Bengal or full Bengal – the lady who was fostering her – after she was found – told me ONLY feed her RAW MEAT – so I have been thinking that a small 6 1/2 pound cat – that may have been a kitten when I first got her – as she did get a little bigger after I adopted her – tho, I was told by my sister, Niki who has helped thousands of homeless animals get homes – that because of the way her teeth looked she most likely was not a kitten when I got her & instead was any where from 2- 6 years old when I got her – so, I am still considering her about 3-5 years old – So, is she now considered an adult cat⁉️🙁 And have only been feeding her raw meat⁉️ as we have now had her for for about 3 years & here is the bigger question – i have been using colloidal silver on her eye as she was diagnosed as having Herpes conjunctivitis – in her right eye & an ear infection – when we first got her & she still has it from when I first got her & had used antibiotics & spent so much money – on so many different vets – that I just stopped as I was also told – it is NOT CURABLE⁉️ & So, now I just clean out the white gunk that shows up in her eye with an eye wash & after put some colloidal silver in her eye & use a small plug in ozone wand in her ear & her ear & eye are better for a while & she seems to do better – but then I need to do it again⁉️😢 wonder if you can suggest a better eye wash for her – or if I could send a photo of her ⁉️🙁

    1. Avatar photoDr. Pete Wedderburn, DVM Post author

      Hi Simm and thanks for your query. Yes, I mean spayed OR neutered. In my opinion, there is no need for Bengal cats to be fed only raw meat – this is an untrue myth. Any complete cat food will suffice.
      As for herpes virus, if you read our article on this here you should be able to learn everything you need to know about this condition. In general, my advice is to just bathe affected eyes using a wad of cotton wool soaked in mildly salty water (a teaspoonful of salt in a pint of boiled water, cooled down). Hope this helps.