A cat calorie calculator takes the guesswork out of feeding your cat. Cats have very specific caloric needs based on their weight, age, activity, and health goals — overfeeding is the leading cause of feline obesity, and underfeeding can cause muscle loss. Enter your cat's details below to get a personalized daily calorie target and feeding guide.
Cat Profile
Life stage multiplier used: —
Daily Feeding Guide
Dry Food (kibble)
~380 kcal/cup average — check your bag
Wet Food (3 oz can)
~90 kcal/can average — check your label
Raw Food
~500 kcal per 100g average
Meal Frequency Recommendation
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Treat Allowance (10% rule)
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Treats should be no more than 10% of daily calories. Reduce main meals accordingly.
How to Use the Cat Calorie Calculator
Feline obesity affects an estimated 60% of domestic cats in the United States, making overfeeding the most common nutritional problem in pet care. This cat calorie calculator uses the veterinary RER × life stage factor method to give you an accurate daily calorie target and practical feeding amounts for dry, wet, or raw food.
Step 1: Enter your cat's weight
Use your cat's current body weight from a recent vet visit or home scale. Toggle between kg and lbs depending on your preference. If your cat is overweight, use the current weight — the calculator adjusts the calorie target downward based on body condition score and goal.
Step 2: Select life stage and body condition
Kittens under 12 months need roughly twice the calories per kg of body weight compared to adults, due to their rapid growth. Senior cats (7+) typically need slightly fewer calories but higher protein. Body condition score (BCS) affects the life stage multiplier — an obese cat gets a lower multiplier to safely reduce caloric intake.
Step 3: Set activity level and neuter status
Spaying or neutering reduces a cat's metabolic rate by approximately 20–30% — this is one of the most common reasons cats gain weight after being fixed. Indoor-sedentary cats need about 20% fewer calories than indoor-active cats. Outdoor cats expend significantly more energy on territory patrol and thermoregulation.
Step 4: Choose your health goal
For weight loss, the calculator applies a 15–20% calorie reduction from maintenance. Never restrict a cat's calories by more than 20% without veterinary supervision — severe caloric restriction can trigger hepatic lipidosis (fatty liver disease) in cats, which is potentially fatal. For weight gain (underweight cats), the calculator adds 15–20%.
Reading the feeding guide
The feeding guide converts your cat's daily calorie target into practical food amounts. Because calorie density varies widely between brands, always check your specific food's calorie content on the bag or can (listed as kcal/cup or kcal/can). Use the calculated amounts as a starting point and adjust based on your cat's weight trend over 2–4 weeks.
The 10% treat rule
Treats should make up no more than 10% of your cat's daily calorie intake. A single commercial cat treat typically contains 1–5 calories. If you give treats, subtract their caloric value from the main meal portions. Using your cat's regular dry kibble as training treats is an effective way to reward without adding extra calories.
FAQ
Is this cat calorie calculator free?
Yes, completely free with no signup required. All calculations run in your browser using established veterinary RER formulas — no data is sent to a server.
How many calories does the average cat need per day?
A healthy adult indoor cat weighing 4 kg (8.8 lbs) needs approximately 200–250 calories per day to maintain weight. Kittens need significantly more per kg of body weight (up to 2× adult needs). Senior cats typically need 10–20% fewer calories than adults. Outdoor cats may need 20–30% more due to activity.
What is RER and how does the cat calorie calculation work?
RER stands for Resting Energy Requirement — the calories needed for basic bodily functions at rest. The formula is RER = 70 × (weight in kg)^0.75. This baseline is then multiplied by a life stage factor (e.g., 1.2× for spayed/neutered adults, 1.6× for kittens, 0.8× for obese cats needing weight loss) to get the Daily Energy Requirement (DER).
How do I convert calories to cups of dry cat food?
Most dry cat foods contain 300–450 calories per cup (240 ml). Check the kcal/cup information on your specific food's bag or manufacturer website. Divide your cat's daily calorie requirement by the kcal/cup to get the cups per day. The calculator uses an average of 380 kcal/cup as a baseline — always check your specific food's label.
How many calories are in a can of wet cat food?
Wet cat food typically contains 70–120 calories per 3 oz (85g) can, and 150–200 calories per 5.5 oz (156g) can. Pâté-style foods tend to be higher in calories than gravy-style foods of the same weight. Always check the guaranteed analysis or calorie content on your specific food label.
How many meals a day should I feed my cat?
Most adult cats do well with 2–3 meals per day at set times (timed feeding). Free-feeding dry food works for cats that self-regulate, but tends to cause obesity in most domestic cats. Kittens under 6 months benefit from 3–4 smaller meals. Senior cats with dental issues often prefer wet food or softened kibble.
Should I consult a vet before changing my cat's diet?
Yes — especially if your cat is overweight, has a medical condition (diabetes, kidney disease, hyperthyroidism), or is very old or young. This calculator provides general guidelines based on established formulas, but your vet can adjust recommendations based on bloodwork, body condition score, and medical history.