Find out exactly how many calories your cat needs each day, personalized to their weight, age, neutered status, and lifestyle.
Editorially ReviewedThis is a starting estimate based on your cat's weight, life stage, and status. Split the total across 2–3 small meals per day. Adjust based on body condition and your vet's guidance.
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The formula behind your cat's daily calories.
Lifestyle changes calorie needs significantly.
Appetite and weight changes to watch for.
More calculators for cat owners.
We use the standard veterinary formula for feline maintenance energy requirements, based on the AAFP (American Association of Feline Practitioners) and AAHA Nutritional Guidelines, the WSAVA Global Nutrition Guidelines, and the Merck Veterinary Manual. The same underlying math used by veterinarians worldwide is what powers this calculator.
Like dogs, a cat's daily calorie need is calculated in two steps. First we compute their Resting Energy Requirement — the calories burned just to stay alive at rest. Then we multiply by a life-stage and activity factor to get the Maintenance Energy Requirement, which is the actual daily feeding target.
| Cat Weight | Neutered Indoor Adult | Intact / Active Adult | Senior Cat |
|---|---|---|---|
| 5 lb | 120 cal | 140 cal | 110 cal |
| 7 lb | 155 cal | 180 cal | 140 cal |
| 9 lb | 190 cal | 220 cal | 170 cal |
| 10 lb | 205 cal | 240 cal | 190 cal |
| 12 lb | 235 cal | 275 cal | 215 cal |
| 15 lb | 280 cal | 325 cal | 255 cal |
| 18 lb | 320 cal | 375 cal | 295 cal |
RER is calculated identically for cats and dogs because the formula is based on metabolic body weight rather than species:
RER = 70 × (weight in kg)0.75
For example, a 10 lb cat weighs about 4.5 kg. Their RER is 70 × (4.5)0.75 ≈ 70 × 3.09 ≈ 216 calories per day. That's their absolute minimum just to keep their body running — no movement, no growth, no extra anything.
MER multiplies the RER by an activity factor that reflects life stage, neutered status, and lifestyle. Cats have much lower multipliers than dogs of equivalent size, which surprises many owners. A 10 lb neutered indoor cat needs roughly 250 calories per day; a 50 lb dog with the same body type would need 1,000+. Cats are remarkably efficient.
Here are the multipliers we use:
The single biggest difference between two same-weight cats' calorie needs is whether they're indoor or outdoor. Indoor cats spend most of the day sleeping and conserving energy. An outdoor cat — especially one that hunts — may burn 30-40% more calories per day. If you have a cat that splits time between indoor lounging and serious outdoor adventures, lean toward the higher activity bracket and adjust based on body condition.
The combination of indoor-only lifestyle and ad-libitum feeding (food always available) is the most common cause of feline obesity. Up to 60% of indoor cats in the U.S. are estimated to be overweight or obese, according to the Association for Pet Obesity Prevention. Scheduled meals at calculated portions is the most effective preventive measure.
This calculator gives you a strong starting estimate. Several real-world factors will push that number up or down:
Once you know your cat's daily calorie target, converting to portions requires knowing the calorie density of your specific food. The pet food industry is required to disclose this in the U.S. on every label as "kcal/cup" or "kcal/can."
A practical approach for a typical 10 lb neutered indoor cat needing 250 calories per day:
Many feline veterinarians recommend at least some wet food daily because of the hydration benefit — cats have a notoriously weak thirst drive, and dehydration contributes to urinary and kidney issues over time.
Always work with your veterinarian on your cat's diet plan, especially if you notice:
A neutered adult cat at a healthy weight typically needs 20-25 calories per pound of body weight per day. A 10 lb neutered indoor cat needs roughly 200-250 calories daily.
An intact or very active cat needs about 25-30 calories per pound. Kittens need significantly more — up to 100 calories per pound for very young kittens, decreasing as they grow.
Most veterinarians recommend scheduled meals (2-3 per day) over free-feeding. Free-feeding makes it impossible to detect appetite changes (an early sign of illness), encourages overeating in food-motivated cats, and complicates weight management.
Scheduled meals also align with cats' natural pattern of multiple small hunts per day.
Indoor cats are typically much less active than outdoor or working cats, so their maintenance energy needs are lower.
A neutered indoor cat needs about 1.2 times their resting energy requirement, while an active outdoor cat may need 1.4-1.6 times their RER. Most house cats fall into the lower range, which is why feline obesity is so common.
Run your hands along your cat's sides — you should be able to feel the ribs without pressing hard. From above, you should see a visible waist behind the ribs. From the side, the belly should tuck up slightly toward the hind legs.
If you can't feel ribs, or the belly hangs low and swings when walking, your cat is likely overweight. Body Condition Score (BCS) charts from your vet give a more precise measurement.
Yes, and they add up faster than most owners realize. Treats should make up no more than 10% of your cat's daily calories. For a 10 lb cat needing 250 calories per day, that's just 25 calories — about 2-4 small treats depending on the brand.
A few extra treats per day can cause a cat to gain 1-2 pounds per year, which is significant on a small frame.
Per ounce, dry food is far more calorie-dense (around 300-500 cal/cup) than wet food (around 70-100 cal per 3 oz can). However, wet food has much higher water content, which is important for kidney health, especially for indoor cats.
Many cat owners use a combination — wet food for hydration and dry food for grazing — but portions must be tracked carefully because mixing makes it easy to overfeed.