Cat Calorie Calculator — Daily kcal by Life Stage & BCS
How many calories does your kitty need each day? This calculator applies the NRC RER × DER feline equations with feline-specific activity factors — adjusting for neuter status, life stage, and body-condition score (BCS) — then converts the total to cups or grams of your specific food brand. Cats over BCS 6 face a 2-3× higher diabetes risk, so daily calories really matter.
Calculator
Ribs palpable without excess fat. Waist clearly observed behind ribs when viewed from above. Abdominal tuck visible from the side.
Wet food vs dry food: how do calorie needs change?
| Aspect | Wet (canned) food | Dry kibble |
|---|---|---|
| Typical kcal density | 70-120 kcal / 3 oz can | 300-450 kcal / cup |
| Moisture content | 70-80% | 6-10% |
| Daily portion (10 lb adult) | 2-3 cans | 0.5-0.6 cup |
| Helps urinary health | Yes — high water intake | No — risk of dehydration |
| Best for diabetes | Yes (low-carb wet) | No (carb-heavy) |
| Cost per day | $1.20-2.50 | $0.30-0.70 |
Frequently Asked Questions
How many calories does a cat need per day?
For a typical neutered indoor adult cat: RER × 1.2 (where RER = 70 × weight_kg^0.75). A 10 lb (4.5 kg) cat needs RER 217 × 1.2 = 260 kcal/day.
Do senior cats need more or fewer calories?
Senior cats (11+) often need more calories due to reduced protein and fat absorption — the opposite of dogs. Weight loss in senior cats is a red flag for hyperthyroidism, kidney disease or diabetes.
How do I know if my cat is overweight?
Body-condition score 4–5 is ideal. 6 is overweight, 7+ is obese. Check: can you easily feel ribs through a thin fat layer? Is there a visible waist from above? Obesity doubles diabetes risk.
How many times a day should I feed my cat?
2–3 meals per day for adults; kittens need 4+. Free-feeding (kibble always out) is a leading cause of feline obesity. Automatic feeders with portion control work well.
How many calories does a kitten need?
Kittens need approximately 2.5× RER — roughly 100–150 kcal/lb/day depending on age. High-quality kitten food (AAFCO-labeled for growth) should be fed until 12 months.
Should I weigh-loss my cat with prescription food?
For BCS 7+ cats, prescription therapeutic weight-loss diets (Hill's Metabolic, Royal Canin Satiety) are more effective than simply reducing regular food, and less likely to cause hepatic lipidosis. Consult your vet.
Sources & References
- [1]NRC Nutrient Requirements of Dogs and Cats — National Research Council (2006)
- [2]AAFP Nutrition Guidelines — American Association of Feline Practitioners
- [3]Feline obesity prevalence and management — Association for Pet Obesity Prevention
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