Free Cat Calorie Calculator
A cat calorie calculator estimates your cat's daily caloric needs (kcal/day) using veterinary RER and MER formulas. Enter weight, life stage, activity, and body condition to get a personalized feeding target.
Spayed or neutered indoor cat
Most dry cat foods are 300-500 kcal/cup. Check the bag's calorie statement. Leave blank to use 350 kcal/cup as a default.
Daily Calorie Needs
Note: This calculator provides estimates based on standard veterinary RER/MER formulas (sourced from Ohio State Veterinary Medical Center and WSAVA guidelines). Cats with kidney disease, diabetes, hyperthyroidism, or other medical conditions have different needs - please consult your veterinarian for a personalized feeding plan.
How the Cat Calorie Calculator Works
Cat caloric needs are estimated using two veterinary formulas. First the Resting Energy Requirement (RER) - the baseline calories a cat burns at rest:
RER is then multiplied by a Maintenance Energy Requirement (MER) factor based on life stage and activity:
- Kitten 0-4 months: RER x 2.5
- Kitten 4-12 months: RER x 2.0
- Intact adult: RER x 1.4
- Neutered adult: RER x 1.2
- Inactive / obese-prone adult: RER x 1.0
- Active / outdoor adult: RER x 1.6
- Weight loss (using ideal weight): RER x 0.8
- Weight gain (using ideal weight): RER x 1.2-1.4
- Pregnant: RER x 2.0
- Lactating queen: RER x 2.0-6.0 (default 4.0)
Quick Cat Calorie Reference (Neutered Adult)
| Weight | RER | Daily kcal | Cups/day |
|---|---|---|---|
| 6 lbs (2.7 kg) | 148 | 178 | 0.5 |
| 8 lbs (3.6 kg) | 184 | 221 | 0.6 |
| 10 lbs (4.5 kg) | 218 | 262 | 0.7 |
| 12 lbs (5.4 kg) | 249 | 299 | 0.9 |
| 15 lbs (6.8 kg) | 295 | 354 | 1 |
| 18 lbs (8.2 kg) | 338 | 406 | 1.2 |
Cat Calorie Calculator FAQ
How many calories does my cat need per day?+
Most healthy adult cats need between 180 and 280 kcal per day, depending on weight, activity, and reproductive status. A 10 lb neutered indoor cat typically needs around 200 kcal/day, while an active outdoor cat or intact adult of the same weight may need 230-260 kcal/day.
How do you calculate cat calories?+
Cat calorie needs are calculated by first finding the Resting Energy Requirement (RER): RER = 70 x (body weight in kg)^0.75. The RER is then multiplied by a Maintenance Energy Requirement (MER) factor based on life stage, activity, and reproductive status. Neutered adults use 1.2x RER, intact adults use 1.4x, and active cats use 1.6x.
How many calories does a 10 lb cat need?+
A typical 10 lb (4.5 kg) neutered adult indoor cat needs about 200 kcal per day. An intact adult cat at the same weight needs around 230 kcal/day, and an active or outdoor cat may need 270 kcal/day. Reduce by ~20% if your cat needs to lose weight.
Should I feed my cat fewer calories to lose weight?+
Yes, but cautiously. Aim for the cat's ideal body weight, then multiply that ideal weight's RER by 0.8 to get a safe weight loss target. Never reduce calories abruptly because cats can develop hepatic lipidosis (fatty liver disease) if they lose weight too quickly. Always consult your veterinarian before starting a feline weight loss plan.
How many calories are in a cup of cat food?+
Most dry cat foods contain between 300 and 500 kcal per cup, with an average around 350 kcal/cup. Wet/canned cat food typically contains 70-100 kcal per 3 oz can. Always check the calorie content (kcal/cup or kcal/can) printed on your specific food's label, as calorie density varies widely between brands and formulas.
Is my cat overweight?+
Use the Body Condition Score (BCS): you should be able to feel your cat's ribs with a light touch (not see them protruding), see a slight waist when viewed from above, and a slight tummy tuck from the side. If the ribs are hard to feel under a fat layer, no waist is visible, and there's a sagging belly, your cat is likely overweight.
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