Cat Calorie Calculator: How Many Calories Does My Cat Need Per Day?

How Many Calories Does a Cat Need Per Day?

Feeding your cat the right number of calories is one of the most important things you can do for their long-term health. Too few calories leads to malnutrition; too many leads to obesity, which affects nearly 60% of domestic cats in the US. Our cat calorie calculator above uses the same RER (Resting Energy Requirement) formula used by veterinarians to give you a precise daily calorie target.

How Is a Cat’s Calorie Requirement Calculated?

The formula vets use is based on metabolic body weight:

RER = 70 × (body weight in kg)^0.75

Then the RER is multiplied by a life stage factor to get the daily calorie need (also called MER — Maintenance Energy Requirement).

Cat Calorie Requirements by Weight

Cat Weight	Neutered Adult	Active Adult	Kitten
5 lbs (2.3 kg)	130 kcal	160 kcal	325 kcal
8 lbs (3.6 kg)	180 kcal	220 kcal	450 kcal
10 lbs (4.5 kg)	210 kcal	260 kcal	525 kcal
12 lbs (5.4 kg)	240 kcal	295 kcal	600 kcal
15 lbs (6.8 kg)	280 kcal	345 kcal	700 kcal

Calories in Common Cat Foods

• Wet cat food (3 oz can): ~70–100 kcal
• Dry cat food (1 cup): ~300–500 kcal
• Semi-moist pouches: ~120–180 kcal
• Raw food (per oz): ~45–55 kcal

Always check the label — calorie density varies widely between brands. If you also have a dog, our Dog Food Protein Calculator can help balance their diet too.

Signs Your Cat Is Eating Too Many Calories

• 🔴 Difficulty grooming or reaching their back
• 🔴 Rounded belly that sags when walking
• 🔴 Can’t feel ribs without pressing firmly
• 🔴 Lethargy and reduced playfulness
• 🔴 Breathing heavily after minimal activity

If you suspect your cat is overweight, a weight loss calculator can help you set safe calorie reduction targets.

How Often Should I Feed My Cat?

• Kittens (under 6 months): 3–4 meals per day
• Adult cats: 2 meals per day
• Senior cats: 2–3 smaller meals per day
• Pregnant/nursing cats: Free-feed or 3–4 meals per day

Frequently Asked Questions

How many calories does a 10 lb cat need per day?

A neutered 10 lb (4.5 kg) adult cat needs approximately 200–210 kcal per day. An active or intact cat of the same weight needs closer to 250–260 kcal.

How many calories are in a can of wet cat food?

Most 3 oz cans of wet cat food contain 70–100 kcal. A 5.5 oz can typically provides 150–200 kcal. Always check the label for the exact ME (metabolizable energy) value.

Should I feed my cat wet or dry food?

Both can be nutritionally complete. Wet food helps with hydration and is lower in calories per gram, making it better for weight management. Dry food is more calorie-dense and convenient. Many vets recommend a mixed wet and dry diet for optimal health.

How do I know if I’m underfeeding my cat?

Signs include visible spine or hip bones, dull coat, lethargy, excessive meowing for food, and weight loss. A routine pet blood test can also reveal nutritional deficiencies.

Conclusion

Getting your cat’s calorie intake right is one of the simplest and most impactful things you can do for their health. Use our cat calorie calculator above as your starting point, then adjust based on your cat’s body condition score and your vet’s guidance. Every cat is different — the calculator gives you a science-based starting point, not a rigid rule.

Questions about your cat’s diet? Drop a comment below!