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Feline Calorie Calculator

With feline obesity becoming a growing problem, it is becoming increasingly important for us to monitor how many calories our cats are consuming. Much like humans, cats have a recommended daily calorie intake, which is dependent on their life stage and their ideal weight. Use the feline calorie calculator below to calculate how many calories your cat needs and how many calories they should be consuming if they need to lose weight.

You will need to know your cat’s ideal weight, which you can find out from your vet, although for an average adult cat, an ideal weight is typically 4-5kg or 8-10lbs.

See below for some tips on safe weight loss.


Not working? View the feline calorie calculator in a separate window

About the Feline Calorie Calculator

The feline calorie calculator uses a basic formula to determine the resting energy requirements (RER) of  felines. The result is a good estimate of how many calories per day you should feed your cat in order to maintain body weight (calorie requirements). To safely lose weight, it is recommended that you feed your cat 80% of their RER, which is shown in the calculator as ‘Calorie Requirements for Weight Loss’.

Neutered cats require fewer calories per day to maintain body weight than intact cats. Kittens also have a much higher calorie requirement. This is reflected in the results. See Pet Obesity Prevention for more details.

If you have any questions or recommendations for the calculator, you can get in touch here.

Safe Feline Weight Loss Tips

Below are some tips for helping your cat to lose weight safely:

  • A safe weight loss goal is around 0.5kg (~1lb) a month
  • Avoid rapid weight loss as this can cause additional problems
  • Switch to a ‘light’ diet manufactured by a reputable manufacturer
  • Don’t give human food as treats (although boiled fish or boneless chicken may be given as a special treat very occasionally)
  • Give specially formulated feline treats that are low in calories
  • Put down multiple small meals as opposed to a couple of big meals
  • Carefully monitor calorie consumption – including main meals, treats or any additional meals
  • Consider keeping a calorie journal
  • Offer fresh water if your cat is begging for food, often this alternative will be enough to satisfy them
  • If your cat continues to beg, offer a very small food portion
  • In multi-cat households, ensure cats are fed individually so you can be sure of what each cat has eaten
  • Try introducing some extra play time (10-15 minutes a day) to get your cat moving and burning some calories

10 comments

  1. Hi,my beloved cat has become over weight. I was given the Royal Canin obesity wet and dry food for her. I am a little confused trying to understand the portions on the packets. She is 5 kg . So on the back of the wet food it stated for 5 kg 2 + 3/4. Does that mean 2 packets of wet and 3/4 of dry food? And if I feed her twice a day I just half the quantity? Thanks Kris

  2. Hi kris,
    My wee fur baby weighed in at 5.5kg and her target weight is to get to around 4kg. I have been feeding royal canin satiety support for 10weeks, she gets 40g per day of dry food, I don’t use wet stuff.
    In this time she has lost around 500g so far and it’s really starting to show.
    Hope this helps, and keep up with the diet you’ll both be a lot happier in the long run.
    ^ also I wouldn’t use this calculator as a guide as get calorie intake is 122 from what I feed and this says she should be on around 200, which is probably were her problems as a sedate house cat have began x

  3. I feed my cat 1/2 cup total every day. She gets 1/4 cup in the morning and the same at 7 pm. She is now 6.8 kg. The thing is, her food is only totaling 221 calories for the amount I’m giving her. Her sister, who I feed the same amount to, is skinny. They are both very very active playful cats. What’s the problem? I’d like to ideally get her to the 5-6 kg weight.

  4. can anyone give me any advice, i have two cats 1 is a healthy 4kg the other is a chubby 6kg, i need to get some weight off her but they feed together and i am at work all day, any advice will be welcome.

  5. I seem to be having the opposite problem from everyone else. My kitty has kidney disease and is not eating even with an appetite stimulant from the vet. I need to find a way to put weight on him and used the calculator to figure out how many calories a day he needs to maintain 7 pounds. Right now the only thing he will touch is baby food and then he only licks it off my fingers. I am really worried about him.

    • Had issues with both dogs .. Too picky..Never would eat dry food.. Wouldn’t eat so I started cooking for them .. Bad idea.. Weight gain..smallish dogs someone just dropped off on dirt road ;(… Anyway, a PetSmart employee had same issue.. Dogs not eating..listless..eyes were dull ..I tried everything. ..was spending abt. $60.00 per week .. So I tried her suggestion …mix one TEASPOON of melted coconut oil in dry food
      ( I use BLUE Buffalo )….they woof it down ..even the senior girl… I’m so happy with this .. And yes they have their vet visits !!

    • Jenny, my cat also is very skinny due to CRF. He will eat cat food, but eats so little of that that he is starving. So, I now feed him baby food supplemented with vitamins and use a phosphorous binder. He is eating more than just licking if off of my finger. Is your cat receiving subcutaneous fluids? Do you give him Pepcid AC? If he felt better, he might eat better. Some people feed their cats with a feeding tube or with a syringe.

  6. Jenny, I would recommend asking about getting an esophageal tube put in. It’s an easy surgical procedure, and can save your cat’s life. Not eating enough can lead to pancreatitis and death very quickly. The etube saved my cat. I’m so glad I asked my vet to do it. I was easily able to syringe high calorie food right into his stomach. The other option was force feeding. There was no way that was going to work. Good luck!

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