Cat Calorie Calculator: How Many Calories Does Your Cat Need?
Reviewed by the veterinary team at Heights Animal Hospital Updated August 24, 2026 6 min read
The short answer
- A typical 10 lb neutered indoor cat needs about 260 calories a day: roughly two and a half 3 oz cans, or about ½–¾ cup of dry food.
- Feline factors are much lower than canine ones: 1.2 × RER for a neutered adult versus 1.6 for a dog.
- Cats must lose weight slowly: 0.5 to 1% of body weight per week. Crash dieting a cat can cause fatal fatty liver disease.
- A cat that stops eating for 48 hours is a medical emergency, regardless of the target on any calculator.
Cats are obligate carnivores with small stomachs, a preference for many small meals, and an unusually strong tendency to gain weight once neutered and kept indoors. Around 60% of cats in the United States are now overweight or obese. The calculator below uses feline-specific energy factors, converts the result into the food actually in your cupboard, and applies the slow weight-loss rate that feline medicine demands.
Cat Calorie Calculator
Enter your cat's weight and life stage for a daily calorie target, a portion in cans or cups, and a weight-loss rate that is safe for a feline liver.
Typical 3 oz pate: 90–110 kcal per can. Check the label.
Daily calorie requirement
–
- Resting (RER)
- – at complete rest
- Feed per day
- –
- Per meal
- – if split into 3 meals
- Treat budget
- – 10% daily maximum
How the number was built
| Step | Calculation | Result |
|---|
Never starve a cat thin. When a cat goes into rapid negative energy balance, fat floods the liver faster than it can be processed and hepatic lipidosis (fatty liver disease) can follow. It is life-threatening and it can develop in a matter of days. Target 0.5 to 1% of body weight per week, keep food intake continuous, and involve your veterinarian in any feline weight-loss plan.
How many calories a cat needs, by weight
Feline energy requirements are calculated the same way as canine ones (resting energy requirement first, then a multiplier) but the multipliers are much lower. A neutered indoor cat sits at just 1.2 × RER, which is why cats gain weight so readily on a portion that looks small.
| Cat's weight | RER | Neutered adult × 1.2 | Intact adult × 1.4 | Indoor / inactive × 1.0 | Weight loss × 0.8 of target |
|---|---|---|---|---|---|
| 5 lb | 129 | 155 | 181 | 129 | 104 |
| 6 lb | 149 | 179 | 209 | 149 | 119 |
| 8 lb | 184 | 221 | 258 | 184 | 147 |
| 10 lb | 218 | 261 | 305 | 218 | 174 |
| 12 lb | 249 | 299 | 349 | 249 | 199 |
| 14 lb | 280 | 336 | 392 | 280 | 224 |
| 16 lb | 309 | 371 | 433 | 309 | 247 |
| 18 lb | 337 | 405 | 472 | 337 | 270 |
| 20 lb | 366 | 439 | 512 | 366 | 293 |
To convert that into food: a 3 oz pate can is usually 90–110 kcal, a 5.5 oz can is 150–200 kcal, and a cup of dry cat food is typically 300–500 kcal. A 10 lb neutered cat needing about 260 calories a day therefore eats roughly two and a half small cans, or a little over half a cup of dry food, which is far less than most owners pour.
Why cats gain weight so easily indoors
Three factors stack up. Neutering lowers metabolic rate and raises appetite. Indoor life removes almost all of the energy expenditure a hunting cat would use. And free-choice dry food, left down all day, makes intake invisible, nobody notices a cat eating 40 extra calories a day, but that is roughly 4 lb of body weight over a year on a cat that should weigh 10.
Measure, do not pour
Use a kitchen scale or a proper measuring cup for dry food, and count cans for wet. A “scoop” is not a unit.
Feed multiple small meals
A hunting cat eats 10–20 tiny meals a day. Three or four scheduled meals suits feline physiology far better than one big bowl.
Make them work for it
Food puzzles and treat balls add activity and slow intake. Cats fed from puzzles show measurable improvements in weight and behaviour.
Consider wet food
Wet food is around 75–80% water, so a satisfying volume carries far fewer calories, and the extra water intake supports urinary tract health.
Feline weight loss: slower is safer
This is the single most important difference between managing a fat cat and a fat dog. Cats mobilise body fat to the liver when they go into negative energy balance, and if that happens too fast (or if a cat simply stops eating) the liver becomes overwhelmed. The result is hepatic lipidosis, a serious and potentially fatal condition that often requires hospitalisation and assisted feeding.
Target 0.5–1% of body weight per week, no faster • never withhold food entirely • if your cat refuses the new food and eats nothing for 24–48 hours, stop and call your veterinarian • weigh every 2 weeks • expect the whole process to take months, not weeks • in a multi-cat home, feed separately so you know who ate what.
A cat is generally considered overweight at about 10–19% above ideal weight and obese at 20% or more. On a 9-point body condition scale, each point above 5 corresponds to roughly 10% over ideal. Since a healthy domestic cat often weighs only 9–10 lb, a single extra pound is already 10%: the equivalent of about 15 lb on an average adult human.
Kittens, seniors and pregnant queens
- Kittens need roughly 2.5 × RER, fed as three or four meals a day on a diet labelled for growth or all life stages. Their requirement changes monthly.
- Adult maintenance is where portion control begins, usually right after neutering, when requirements drop by around 25–30%.
- Senior cats are a special case. From about 11 years, many cats begin losing lean body mass and their ability to digest fat and protein declines. Older cats often need more calories and more protein, not fewer. Unintended weight loss in a senior cat is a red flag, not a diet success.
- Pregnant and nursing queens need 2–4 × maintenance, and should be fed a growth diet free-choice during peak lactation.
Appetite changes are medical information
Has not eaten for 24–48 hours • is losing weight while eating normally or ravenously (think hyperthyroidism or diabetes) • is drinking or urinating noticeably more • is vomiting more than occasionally • has bad breath or is dropping food (dental pain) • has become suddenly food-obsessed or food-avoidant.
Cats are exceptionally good at hiding illness, and appetite is often the only early clue an owner gets. A calculator can tell you what to feed; it cannot tell you why a cat has stopped eating. That part needs an exam.
Frequently asked questions
How many calories does my cat need per day?
Calculate 70 × (weight in kg)0.75, then multiply by 1.2 for a neutered adult, 1.4 for an intact adult, 1.0 for an inactive indoor cat or 2.5 for a growing kitten. A 10 lb neutered cat needs about 260 calories a day; an 8 lb cat about 220; a 15 lb cat about 350. These are starting points: individual cats vary by up to 20%.
How much wet food should I feed my cat a day?
Divide the daily calorie target by the calories per can. A typical 3 oz pate can holds 90–110 kcal, so a 10 lb neutered cat needing 260 kcal eats about two and a half small cans a day. Larger 5.5 oz cans hold 150–200 kcal, so the same cat would need about one and a half. Always check your own label: pate, chunk-in-gravy and stew formulas differ substantially.
How much dry food should a cat eat daily?
Most dry cat foods contain 300–500 kcal per cup, so a 10 lb neutered cat needing about 260 calories eats only around ½ to ¾ of a cup a day. Dry food is calorie dense and easy to over-serve, which is why measuring it (ideally by weight) matters more than for wet food.
How fast can a cat safely lose weight?
0.5 to 1% of body weight per week, which is half the rate considered safe for dogs. For a 15 lb cat that is roughly 1–2 ounces a week. Faster loss, or any period of not eating, risks hepatic lipidosis. A serious fatty liver condition that can develop within days. Feline weight loss should always be planned and monitored with your veterinarian.
Should I feed my cat wet food, dry food, or both?
Both can be complete and balanced; what matters is the calorie total and your individual cat. Wet food carries more water, which supports urinary and kidney health, and delivers fewer calories per satisfying mouthful, which helps with weight control. Dry food is convenient and works well in food puzzles. Mixed feeding is perfectly reasonable as long as you count the calories from both.
Is free feeding bad for cats?
For most indoor, neutered cats, yes. Leaving dry food down all day makes intake impossible to track, hides the appetite loss that is often the first sign of illness, and is closely associated with obesity. Measured meals (three or four small ones) suit feline physiology better and let you notice immediately when something changes.
How many calories should a kitten eat?
About 2.5 × their resting energy requirement. A 4 lb kitten needs roughly 275 calories a day, which is far more per pound than an adult cat. Feed a diet labelled complete for growth or all life stages, offer three or four meals daily, and recalculate every month as they gain.
My cat is always hungry. What does that mean?
It may be behavioural: boredom, learned begging, or genuinely insufficient calories. But persistent hunger combined with weight loss is a classic sign of hyperthyroidism in cats over eight, and of diabetes mellitus at any age. Both are common, both are diagnosed with straightforward blood tests, and both are very treatable when caught early. If your cat is eating well and still losing weight, book an exam rather than increasing the food.
Worried about your cat's weight or appetite?
Heights Animal Hospital in Jackson Heights, NY provides wellness exams, diagnostics, surgery and urgent care. A calculator is a starting point. An exam is the answer.
References
- National Research Council (NRC), Ad Hoc Committee on Dog and Cat Nutrition. Nutrient Requirements of Dogs and Cats. National Academies Press, 2006.
- World Small Animal Veterinary Association (WSAVA) Global Nutrition Committee. “Nutritional Assessment Guidelines” and Global Nutrition Toolkit calorie tables. wsava.org.
- Association of American Feed Control Officials (AAFCO). Dog and Cat Food Nutrient Profiles. aafco.org.
- Brooks D, Churchill J, Fein K, et al. “2014 AAHA Weight Management Guidelines for Dogs and Cats.” JAAHA 2014;50(1):1-11.
- Cline MG, Burns KM, Coe JB, et al. “2021 AAHA Nutrition and Weight Management Guidelines for Dogs and Cats.” JAAHA 2021;57(4):153-178.
- Center SA. “Feline hepatic lipidosis.” Veterinary Clinics of North America: Small Animal Practice 2005;35(1):225-269.
- American Association of Feline Practitioners / International Society of Feline Medicine. Feline-friendly nutrition and weight management resources. catvets.com.