How Many Calories Does a Cat Need a Day?
Cats are obligate carnivores with unique metabolic requirements. Unlike omnivores, feline metabolism relies heavily on continuous gluconeogenesis from dietary protein. Daily calorie requirements are determined in two stages:
- Resting Energy Requirement (RER): The baseline metabolic energy needed for cellular maintenance, organ function, and thermoregulation at complete rest.
- Maintenance Energy Requirement (MER): The actual daily energy requirement after adjusting for neuter status, life stage (kitten vs. adult vs. senior), and activity level.
Feline Calorie Calculator: Resting & Maintenance Energy Math
Here is a worked clinical example for a typical indoor, neutered 10 lb (4.54 kg) adult cat:
10 lb × 0.453592 = 4.536 kg(4.536)^0.75 = 3.11170 × 3.111 = 217.8 ≈ 218 kcal/day- Neutered Adult (1.2×):
218 × 1.2 = 261 kcal/day - Inactive / Senior (1.0×):
218 × 1.0 = 218 kcal/day - Weight Loss (0.8×):
218 × 0.8 = 174 kcal/day
Cat Calorie Calculator by Weight (Pounds & Kilograms)
Server-rendered feline calorie tables. Verified against published NRC 2006 equations.
Cat Calories by Weight (Pounds: 4 to 20 lb)
| Weight (lb) | Weight (kg) | Base RER (kcal) | Neutered Adult (1.2–1.4×) | Inactive (1.0×) | Weight Loss (0.8×) |
|---|---|---|---|---|---|
| 4 lb | 1.8 kg | 109 kcal | 131–153 kcal | 109 kcal | 88 kcal |
| 5 lb | 2.3 kg | 129 kcal | 155–181 kcal | 129 kcal | 103 kcal |
| 6 lb | 2.7 kg | 148 kcal | 178–208 kcal | 148 kcal | 119 kcal |
| 7 lb | 3.2 kg | 167 kcal | 200–233 kcal | 167 kcal | 133 kcal |
| 8 lb | 3.6 kg | 184 kcal | 221–258 kcal | 184 kcal | 147 kcal |
| 9 lb | 4.1 kg | 201 kcal | 241–281 kcal | 201 kcal | 161 kcal |
| 10 lb | 4.5 kg | 218 kcal | 261–305 kcal | 218 kcal | 174 kcal |
| 11 lb | 5 kg | 234 kcal | 280–327 kcal | 234 kcal | 187 kcal |
| 12 lb | 5.4 kg | 249 kcal | 299–349 kcal | 249 kcal | 200 kcal |
| 13 lb | 5.9 kg | 265 kcal | 318–371 kcal | 265 kcal | 212 kcal |
| 14 lb | 6.4 kg | 280 kcal | 336–392 kcal | 280 kcal | 224 kcal |
| 15 lb | 6.8 kg | 295 kcal | 354–413 kcal | 295 kcal | 236 kcal |
| 16 lb | 7.3 kg | 310 kcal | 371–433 kcal | 310 kcal | 248 kcal |
| 18 lb | 8.2 kg | 338 kcal | 406–473 kcal | 338 kcal | 270 kcal |
| 20 lb | 9.1 kg | 366 kcal | 439–512 kcal | 366 kcal | 293 kcal |
Cat Calories by Weight (Kilograms: 1.5 to 10 kg)
| Weight (kg) | Weight (lb) | Base RER (kcal) | Neutered Adult (1.2–1.4×) | Inactive (1.0×) | Weight Loss (0.8×) |
|---|---|---|---|---|---|
| 1.5 kg | 3.3 lb | 95 kcal | 114–133 kcal | 95 kcal | 76 kcal |
| 2 kg | 4.4 lb | 118 kcal | 141–165 kcal | 118 kcal | 94 kcal |
| 2.5 kg | 5.5 lb | 139 kcal | 167–195 kcal | 139 kcal | 111 kcal |
| 3 kg | 6.6 lb | 160 kcal | 191–223 kcal | 160 kcal | 128 kcal |
| 3.5 kg | 7.7 lb | 179 kcal | 215–251 kcal | 179 kcal | 143 kcal |
| 4 kg | 8.8 lb | 198 kcal | 238–277 kcal | 198 kcal | 158 kcal |
| 4.5 kg | 9.9 lb | 216 kcal | 260–303 kcal | 216 kcal | 173 kcal |
| 5 kg | 11 lb | 234 kcal | 281–328 kcal | 234 kcal | 187 kcal |
| 6 kg | 13.2 lb | 268 kcal | 322–376 kcal | 268 kcal | 215 kcal |
| 7 kg | 15.4 lb | 301 kcal | 361–422 kcal | 301 kcal | 241 kcal |
| 8 kg | 17.6 lb | 333 kcal | 400–466 kcal | 333 kcal | 266 kcal |
| 9 kg | 19.8 lb | 364 kcal | 436–509 kcal | 364 kcal | 291 kcal |
| 10 kg | 22 lb | 394 kcal | 472–551 kcal | 394 kcal | 315 kcal |
Unlike dogs, cats cannot tolerate sudden calorie deficits or fasting. Rapid calorie restriction triggers massive peripheral fat mobilization to the liver, causing feline hepatic lipidosis (fatty liver syndrome). This condition can lead to acute liver failure within days without medical intervention.
Cat Breeds Directory: Breed-Specific Calorie & Nutrition Guides
Access tailored portion guides, average breed weights, and feeding advice for all 76 cat breeds:
Frequently Asked Questions About Cat Calorie Needs
How many calories does a cat need a day?
An average indoor neutered adult cat weighing 10 lbs (4.5 kg) needs approximately 218 to 260 kcal/day to maintain body weight. Calorie needs scale by metabolic body weight (70 × kg^0.75) and life stage. Inactive or senior cats require fewer calories (about 200–218 kcal/day), while intact active cats require 260–305 kcal/day.
How much should I feed a 10 lb cat?
A healthy 10 lb (4.5 kg) neutered adult cat has an RER of 218 kcal/day. Using the standard AAHA neutered multiplier of 1.2×, the cat requires 261 kcal/day. In commercial wet food (typically ~70–90 kcal per 3 oz can), this equates to roughly 3 cans per day, or 1/2 to 2/3 cup of typical dry kibble (~380 kcal/cup).
How many calories should an overweight cat eat to lose weight?
Overweight cats should be fed approximately 0.8× RER calculated from their target (ideal) body weight. For example, if a cat currently weighs 15 lbs but has a target weight of 10 lbs (4.5 kg), use the 10 lb RER (218 kcal) × 0.8 = approximately 174 kcal/day. Weight loss must be monitored closely to ensure the rate does not exceed 0.5% to 1.0% of body weight per week.
Why is rapid weight loss dangerous for cats (hepatic lipidosis)?
When a cat experiences severe calorie restriction or stops eating for more than 48 hours, peripheral body fat is mobilized rapidly to the liver. Because felines have unique protein and liver metabolism, fat accumulates in liver cells, leading to feline hepatic lipidosis (fatty liver disease), which can be fatal without intensive medical care. Never put a cat on a crash diet.
How do kitten calorie requirements differ from adult cats?
Kittens have very high energy requirements to support skeletal growth, muscle formation, and play. Kittens under 4 months of age need approximately 2.5× RER. Kittens between 4 and 12 months need about 2.0× RER. For example, a 4 lb kitten under 4 months requires about 273 kcal/day.