“How much should I feed my cat?” sounds simple, but it’s the question behind one of the most common health problems veterinarians see: feline obesity. Feed too little and a cat loses condition; feed too much — far more common — and the extra weight raises the risk of diabetes, joint pain and a shorter life. This guide gives you a clear method: estimate daily calories by weight and activity, check the result against your cat’s body condition, and adjust. It draws on guidance from the AVMA, the Cornell Feline Health Center and the ASPCA.
Step 1: Estimate daily calories
A useful rule of thumb for a lean, indoor adult cat is roughly 20 calories per pound of body weight per day. So a healthy 10-pound cat needs about 200 calories daily. That figure shifts with the cat’s situation:
- Indoor / less active: lean toward the lower end — sedentary cats burn fewer calories.
- Active / young adult: a bit more to fuel movement and play.
- Overweight, on a weight-loss plan: your vet will set a calorie target based on the cat’s ideal weight, not current weight.
- Kittens, pregnant or nursing cats: substantially higher — see our feeding guide by age.
Then translate calories into portions using the kcal-per-cup or kcal-per-can figure printed on your food. A cup of one kibble might be 300 calories while another is 450 — which is exactly why eyeballing portions fails. The choice between formats also affects calorie density, covered in our wet vs dry cat food guide.
Step 2: Check the body condition score
Calorie math is a starting estimate; your cat’s body is the real verdict. Veterinarians use a body condition score (BCS) — a hands-on, eyes-on check that’s more reliable than the scale alone, because a 12-pound cat can be perfect or chubby depending on frame.
Run the check weekly: feel along the ribs (you should feel them like the back of your hand), look down from above for an hourglass waist, and view from the side for a slight tummy tuck. Drifting toward “ribs hard to find, waist gone”? Trim the portion. Too thin? Increase it — and rule out illness with your vet.
Step 3: Avoid the overfeeding traps
Most overfeeding is accidental. A few habits quietly tip the balance:
- The bottomless bowlTopping up dry food all day makes intake invisible. Switch to measured meals so you actually know how much goes in.
- Uncounted treatsTreats should stay under about 10% of daily calories. A handful of treats can be a quarter of a small cat’s daily energy — subtract them from meals.
- Trusting the bag chartFeeding charts are averages and often run high. Use them as a start, then adjust down if the cat gains.
- Multi-cat free accessOne cat hogs the bowl while another misses out. Feed separately so each gets its right portion.
Worked example: putting it together
Numbers feel abstract until you run a real one, so here’s a typical case. Suppose you have a 10-pound indoor adult cat at an ideal body condition. Using the rule of thumb, you’d start around 200 calories per day. You feed a dry food that lists 400 calories per cup, which means roughly half a cup spread across two meals — about a quarter cup each. If you also give two small wet-food meals at 35 calories each, that’s 70 calories from wet, leaving about 130 calories for dry, or roughly a third of a cup of kibble for the day. The exact split matters less than the total: keep the daily calories near the target and let body condition fine-tune it.
Now layer in treats. If you hand out a few that add up to 20 calories, subtract those from the meals so the total still lands near 200. This is the discipline that separates a cat that holds a healthy weight from one that slowly creeps up — the treats aren’t “extra,” they’re part of the daily budget. Recalculate whenever the cat’s weight, age or activity changes, and always anchor the math to the food’s own calorie label rather than a generic cup-to-cup assumption.
How life stage and lifestyle shift the math
The 20-calories-per-pound figure is a baseline for a lean adult, but real cats live across a wide range. Kittens, as covered in our feeding guide by age, need far more energy per pound to fuel growth. Intact, highly active, or outdoor cats burn more than couch-loving indoor cats. Pregnant and nursing queens have dramatically higher needs. And many cats slow down after being spayed or neutered, which lowers their energy requirement — a common reason a once-lean cat starts gaining if portions aren’t trimmed to match.
Because of this variation, treat any formula as a hypothesis to test, not a final answer. Weigh your cat on the same scale every couple of weeks, run the body condition check, and adjust the portion by about 10% in the appropriate direction when the trend drifts. Small, steady corrections beat dramatic swings — and consistency in feeding pairs naturally with the consistency that makes training a cat work.
Frequently Asked Questions
How many calories does a cat need per day?
A typical lean indoor adult cat needs roughly 20 calories per pound per day, so a 10-pound cat needs about 200 calories. Active or growing cats need more; overweight or sedentary cats need less. These are starting estimates — your veterinarian can set a precise target.
How do I know if my cat is overweight?
Use a body condition score. In an ideal cat you can easily feel the ribs under a thin fat layer, see a waist from above, and notice a slight tummy tuck from the side. If the ribs are hard to feel and the waist is gone, the cat is likely overweight.
Why is overfeeding so common in cats?
Free-feeding dry food, generous treats and eyeballed portions all add up quietly. Because cats are small, even a little extra each day causes weight gain over time. Measuring every meal and counting treats in the daily total is the simplest fix.
Should I follow the feeding chart on the bag?
Only as a starting point. Bag charts are population averages and often run high. Start there, then adjust over a few weeks based on your cat’s body condition, reducing the amount if the cat gains weight.
Sources
- American Veterinary Medical Association (AVMA) — Pet obesity & nutrition
- Cornell Feline Health Center — Obesity & feeding your cat
- ASPCA — General cat care & nutrition