How many calories should an average indoor cat eat per day?

Most healthy adult domestic cats weigh between 8 and 11 pounds (3.6 to 5 kg) and require roughly 180 to 230 calories per day to maintain a healthy body condition score.

How many wet food cans does my cat need per day?

A standard 85 g (3 oz) can typically contains 70 to 85 kcal. A 10 lb cat requiring ~215 kcal/day needs approximately 2.5 to 3 small cans per day if fed an exclusively wet diet.

How do I calculate calories for an overweight cat safely?

Always calculate calories based on your cat’s estimated ideal target weight rather than their heavy scale weight, using a weight loss factor of 0.8× RER. Never starve a cat; steady weight loss of 1% to 1.5% of body weight per week protects against feline hepatic lipidosis.

Cats • nutritionVerified Formula

Cat Calorie Calculator

Computes resting energy (RER) and daily maintenance energy (MER) for cats and kittens based on weight, neuter status, and activity.

Parameters

Calculated Output

Estimated Daily Energy Requirement

261kcal/day218 kcal/day (RER)

Expected Range: 235 – 287 kcal/day

What This Result Means

A cat weighing 10 lbs with this profile requires approximately 261 kcal/day.

Calculation Details & Equivalents

Resting Energy Requirement (RER)

218 kcal/day

Life Stage Multiplier

1.2×

Equivalent 3 oz Wet Cans (~80 kcal/can)

~3.3 cans/day

Equivalent Dry Kibble (~380 kcal/cup)

~0.69 cups/day

Veterinary & Animal Science Advisory

This calculator provides evidence-based estimates derived from published veterinary equations (NRC, WSAVA, FAO). Outputs are intended for educational and decision-support guidance only. Always consult a licensed veterinarian or qualified specialist for clinical diagnosis, treatment planning, or prescription drug administration.

Understanding the Cat Calorie Calculator

What This Calculator Does

Knowing your cat's daily calorie needs is the single most effective way to prevent feline obesity and support a long, active life. Our cat calorie calculator computes both baseline Resting Energy Requirement (RER) and daily Maintenance Energy Requirement (MER) using official veterinary equations from the National Research Council (NRC) and WSAVA.

How to Use This Calculator

Simply enter your cat’s current weight and select their life stage or activity level. The calculator first finds their resting metabolic rate using the allometric scaling formula, then applies validated veterinary multipliers to establish their daily feeding calorie target.

Key Factors That Affect the Result

Indoor and neutered cats have lower baseline metabolic rates and burn about 20% to 25% fewer calories than intact or outdoor hunting cats.
Kittens require up to 2.5 times their resting calories to fuel rapid skeletal and muscular development.
Safe weight loss requires a moderate, steady calorie reduction (0.8× RER of target weight), never a sudden crash diet.
Wet canned food provides high satiety and moisture, making calorie control easier without leaving your cat feeling hungry.

Why This Matters for Your Cats

Maintaining a lean body weight reduces the risk of feline osteoarthritis, type 2 diabetes, and urinary tract disease. Understanding your cat’s daily calorie target empowers you to read pet food labels with confidence and portion meals accurately.

Veterinary Advisory: This calculator provides educational guidance based on standard veterinary nutrition guidelines. Always consult your veterinarian before starting any significant weight loss program.

Reviewed & verified by Dr. Imad Khan, DVM, MSc · Doctor of Veterinary Medicine & Masters in Poultry Science · View editorial credentials →

Formula & Mathematical Methodology

Standard Mathematical Formula

RER = 70 × (Body Weight in kg)^0.75 | MER = RER × Life Stage Factor (1.2 neutered adult, 1.4 intact, 0.8 safe weight loss, 2.5 growing kitten)

Formula Variables Defined

BWCat Body Weight(kg or lbs)

Current body weight of cat

RERResting Energy Requirement(kcal/day)

Basal calories required at rest to support vital organs

MERMaintenance Energy Requirement(kcal/day)

Total daily calories needed including daily activity

Step-by-Step Calculation Example

Example: 4.5 kg (10 lb) Indoor Neutered Cat

A 4.5 kg (10 lb) domestic shorthair adult indoor cat.

Convert weight to kg: 10 lbs ÷ 2.20462 = 4.54 kg
Calculate RER: 70 × (4.54)^0.75 = 217 kcal/day
Apply indoor neutered multiplier (1.0–1.2×): ~215–225 kcal/day

Final Output: 217 kcal/day (Range: 195 – 239 kcal/day)

Key Assumptions

The cat is consuming a complete and balanced commercial cat diet.

Biological Limitations

Neutered indoor cats have lower baseline metabolic rates and require close portion monitoring.
Rapid feline weight loss carries a risk of hepatic lipidosis (fatty liver syndrome); weight loss should never exceed 1% to 2% of body weight per week.

Verified Scientific & Veterinary Sources

Version: 1.2.0•Methodology Reviewed: 2026-09-14

1. Nutrient Requirements of Dogs and Catstextbook

National Research Council (NRC) Committee on Animal Nutrition (2006). National Academies Press, Washington, D.C.

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2. WSAVA Global Nutrition Guidelines & Calorie Calculator Referenceguideline

World Small Animal Veterinary Association (WSAVA) Global Nutrition Committee (2021). Journal of Small Animal Practice

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