How Much Should I Feed My Cat? A Simple Guide
If you’ve ever stood in the kitchen holding a scoop and wondered whether your cat really needs another spoonful, you’re not alone. Feeding a cat sounds easy until you read the back of the bag. The chart says one thing, your vet says another, and your cat insists she’s starving. She says that every day, by the way.
The good news is that the question has a fairly clear answer once you know your cat’s weight and a few other details. You can work through the steps below, or skip straight to our how much should I feed my cat calculator and get a daily amount in a few seconds.
Why the feeding chart on the bag is only a starting point
Pet food packaging has to cover every cat, so the guidance is broad. It usually gives a range, and it tends to lean generous. A neutered indoor cat who spends most of the day on the sofa needs far less than an active young cat who runs the house at 3 a.m.
Small mistakes add up quickly. A cat that needs about 250 calories a day and gets just 20 extra will gain roughly two pounds in a year. On a 10 pound cat, that’s a fifth of her body weight. Obesity in cats is linked to diabetes, joint pain and a shorter life, so getting the amount right matters.
How vets work out a cat’s daily calories
Vets don’t guess. They start with something called resting energy requirement, or RER. This is the energy a cat needs just to stay alive while lying still. The formula is:
RER = 70 × (weight in kg) ^ 0.75
Then they multiply that number by a factor that fits the cat’s life stage:
| Cat type | Multiply RER by |
|---|---|
| Neutered adult | 1.2 |
| Unneutered adult | 1.4 |
| Overweight, losing weight | 0.8 |
| Kitten (4 to 12 months) | about 2 |
| Young kitten (under 4 months) | about 2.5 to 3 |
For a typical neutered adult, that works out to roughly this:
| Cat weight | Calories per day (approx.) |
|---|---|
| 3 kg (6.6 lb) | 190 |
| 4 kg (8.8 lb) | 240 |
| 5 kg (11 lb) | 280 |
| 6 kg (13 lb) | 320 |
Those are estimates, not rules. They’re a very good place to start, though, and much better than eyeballing a scoop.
Turning calories into actual food
Calories are useful, but you feed your cat in cups and cans. This is where it gets confusing, because foods vary a lot.
Dry food usually has 350 to 400 calories per cup. Wet food in a standard 3 oz (85 g) can is usually 70 to 100 calories. So a 4 kg neutered cat needing about 240 calories would eat roughly two thirds of a cup of dry food, or around three small cans of wet food.
The only way to be sure is to check the label on your own food. Look for “kcal per cup”, “kcal per can” or “kcal per kg”. If you feed a mix of wet and dry, work out each portion separately so the total adds up to her daily target. That’s the step most people skip, and it’s where the extra calories sneak in.
What changes the number
Weight is the biggest factor, but not the only one. A few things can move her daily needs up or down:
- Neutering. Spayed and neutered cats burn fewer calories, which is why the multiplier drops.
- Activity. A cat with a catio and a toy obsession needs more than a cat who naps 18 hours a day.
- Age. Kittens need a lot of fuel to grow. Senior cats often slow down, though some older cats lose weight and need more.
- Pregnancy and nursing. Mothers can need two or three times their normal amount.
- Health conditions. Kidney disease, diabetes and thyroid problems all change feeding advice. If your cat has any of these, follow your vet’s plan, not a calculator.
If you’re not sure how old your cat is in human terms, our cat age calculator can help you work out her life stage, which makes the feeding choice easier.
How often should you feed her?
Most adult cats do well on two to four small meals a day. Cats are natural grazers, so many prefer several small meals to one big one. Leaving a bowl of dry food out all day can work for some cats, but it makes portion control hard, and plenty of cats will eat out of boredom.
If your cat inhales her food, try a puzzle feeder or a slow-feed bowl. It stretches mealtime and gives her something to do.
Using the calculator
Our cat food calculator does the maths for you. Here’s how it works:
- Enter your cat’s weight.
- Add her age or life stage.
- Say whether she’s neutered and how active she is.
- Choose wet, dry or a mix.
- Read your daily amount, then split it into meals.
Treat the result as your starting point. Every cat is a little different, so watch how she responds over the next few weeks.
How to tell if you’re feeding the right amount
Numbers are only half the story. Your cat’s body will tell you the rest. You should be able to feel her ribs under a thin layer of fat, like running your hand across the back of your knuckles. From above, she should have a visible waist. From the side, her belly should tuck up slightly.
Weigh her once a month. If she’s gaining and shouldn’t be, cut her daily food by about 10 percent and check again in two weeks. If she’s losing weight without a plan, check with your vet, since that can be a sign of illness.
Don’t forget the treats
Treats count. Keep them to about 10 percent of her daily calories, and take that amount out of her meals. A few crunchy treats can easily add up to 30 or 40 calories, which is a big slice for a small cat.
The bottom line
There’s no single answer to “how much should I feed my cat,” because every cat is different. But there is a method: work out her daily calories, check what’s in your food, split it into meals, and adjust based on her body shape and weight. Start with the how much should I feed my cat calculator, keep an eye on her, and talk to your vet if anything seems off. Your cat will still ask for more. That’s just part of owning one.