Cat Calorie Calculator
Calculate your cat's daily calorie needs using the RER (Resting Energy Requirement) formula — the gold standard in feline nutrition. Adjusts for weight, life stage, body condition, and spay/neuter status.
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Cat Calorie Formula Explained
Daily Calories = RER × Life Stage Factor
Cats are obligate carnivores — their calorie needs are met primarily through protein and fat. Unlike dogs, cats cannot efficiently use carbohydrates for energy.
| Life Stage | Multiplier | Example (10 lb cat) |
|---|---|---|
| Kitten | 2.5 × RER | ~360 kcal/day |
| Adult Neutered | 1.2 × RER | ~215 kcal/day |
| Adult Intact | 1.4 × RER | ~250 kcal/day |
| Senior | 1.1 × RER | ~200 kcal/day |
| Weight Loss | 0.8 × RER | ~170 kcal/day |
| Pregnant/Nursing | 2.0-4.0 × RER | ~430-570 kcal/day |
Frequently Asked Questions
Spaying and neutering reduces metabolic rate by approximately 20-30% in cats. Hormonal changes lead to decreased activity and altered energy metabolism. This is why many cats gain weight after the procedure — they're being fed the same amount but burning fewer calories.
Wet food (canned) is generally better for weight management because it's lower in calories per volume (70-150 kcal/can vs. 300-500 kcal/cup of dry) and has higher moisture content, which helps cats feel fuller. The high water content (75-80%) also supports urinary tract health — a common concern in cats.