How much should a cat weigh?

How Much Should A Cat Weigh?

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How much should a cat weigh?

Cats don’t vary in size as much as dogs do; however, there can be quite a difference between breeds of cat. Some are small and muscular, long and lean or large and solid. The answer is on a par with how long is a piece of string? It can be narrowed down, but it is still dependent on the build of the individual cat.

I have four cats ranging in weight from 3.8 kg to 6 kg. Three are oriental type breeds and one domestic shorthair. The 3.8 kg Tonkinese is on the small side, and the 6 kg cat is on the large side (and needs monitoring to make sure he doesn’t gain more weight).

How much should a cat weigh?

The following table is a guideline only, evaluating a cat’s body condition is a more accurate way to determine if a cat is overweight or underweight.

Small to medium cats or breeds3.5 to 5.5 kg (7.7 to 12.1 pounds)
Large cats or breeds6-8 kg (13 to 17.6 pounds)

Evaluating body condition

The number on the scales can give you a general picture of your cat’s weight, however as we know, cats come in all shapes and sizes and therefore instead of focusing entirely on a number on the scales, a better way to determine if your cat is overweight or underweight is to go by look and feel.

  • Ribs: You should be able to feel the ribs when you run your hands along your cat’s sides, but they should have a thin covering of fat over them. Ribs which can easily be seen or felt are an indicator your cat is underweight. If you can’t feel the ribs at all, he is overweight.
  • Spine: The same goes for the spine, you should be able to feel it when you run your fingers along the back, but it shouldn’t be overly noticeable. If you stand over your cat, you should see the torso tuck in where the ribs finish. An exaggerated tuck is a sign of an underweight cat; overweight cats may have no tuck at all.
  • Keep a record: Veterinarians usually routinely weigh cats during visits, it is a good idea to make a note of your cat’s weight when he is fit and well so that you can use this number to determine any weight gain or weight loss in the future. Make a file for your cat where all of his veterinary papers are stored and keep a note of his healthy weight in there.

Either way, you should see a veterinarian to determine if there is a medical reason your cat is underweight or overweight.

Causes of weight loss in cats

  • Inadequate amount of food – Underfeeding, inter-cat bullying or a deficient diet.
  • Hyperthyroidism – This endocrine disease is usually due to a benign tumour of the thyroid gland.
  • Diabetes mellitus – As glucose is unable to enter the cells, the body will become starved of energy, so it begins to break down fat stores as an alternative fuel source.
  • Kidney disorders such as acute or chronic kidney disease and glomerulonephritis
  • Addison’s disease – An endocrine disorder of the adrenal glands which results in a deficiency in the production of corticosteroids.
  • Cancer – Many types of cancer can lead to weight loss and wasting in cats.
  • Dental problems, which can make eating painful.
  • Intestinal parasites such as roundworm, cryptosporidium, giardia – Weight loss can occur if the parasite is competing with the cat for nutrients (in the case of roundworms), or by causing vomiting and diarrhea in cats.
  • Exocrine pancreatic insufficiency – A disease caused by a failure of the pancreas to secrete adequate levels of pancreatic enzymes which result in an inability to digest food.
  • Feline Immunodeficiency Virus – Viral infection, similar to HIV in humans.
  • Feline leukemia virus – FeLV is a viral infection caused by reovirus, which is in the same family as the feline immunodeficiency virus. It is an oncovirus, meaning it can cause cancer. It also suppresses the immune system.
  • Heartworm disease
  • Inflammatory bowel disease
  • Liver disease
  • Pancreatitis – An inflammation of the pancreas due to pancreatic enzymes which begin to break down and digest the organ.
  • Pyometra – Infection of the uterus.
  • Stress – Can lead to a loss of appetite.

Causes of weight gain in cats

  • Overfeeding
  • Acromegaly
  • Hypothyroidism
  • Pregnancy

How much should a cat eat?

There are several factors in determining how much your cat should eat. A kitten will eat more frequently but smaller meals. A pregnant or lactating cat will need to eat more than an adult cat. A young and active cat will consume more than a sedentary cat. Therefore there are no hard and fast rules.

I generally let my cats gauge how much food to feed them. They are fed half a can of cat food twice a day, with biscuits to free feed.



Julia has been a published cat author for over twenty years with an emphasis on detail and accuracy. Her knowledge of cats continues to grow through research and ensuring she constantly stays up to date on the latest health and cat care information and guidelines to ensure the information on Cat-World remains up to date.Full author bio     Contact Julia