Cat Daily Calorie & Energy Calculator (RER / MER)
Calculate your cat's exact daily food calorie target based on clinical feline metabolic formulas (WSAVA guidelines), weight, activity, and weight goals.
Input Parameters
Enter weight and select lifestyle / goal.
Daily Target Calories (MER)
Veterinary Tip
Cats are obligate carnivores. Ensure daily food intake consists of high-protein wet or dry food with sufficient moisture content.
Daily Feline Calorie Requirements by Weight & Status
| Body Weight | Basal RER (kcal) | Neutered Indoor (1.2×) | Weight Loss Goal (0.8×) | Active Outdoor (1.6×) |
|---|---|---|---|---|
| 3.0 kg (6.6 lbs) | 159 kcal | 191 kcal/day | 127 kcal/day | 255 kcal/day |
| 4.0 kg (8.8 lbs) | 198 kcal | 237 kcal/day | 158 kcal/day | 316 kcal/day |
| 5.0 kg (11.0 lbs) | 234 kcal | 281 kcal/day | 187 kcal/day | 375 kcal/day |
| 6.0 kg (13.2 lbs) | 268 kcal | 322 kcal/day | 215 kcal/day | 429 kcal/day |
Calculation Methodology & Biological Principles
Feline WSAVA Equations
Resting Energy Requirement (RER) scales by metabolic surface mass. Life-stage factors adjust energy output for neuter status, outdoor exercise, pregnancy, or weight management goals.
Veterinary Disclaimer
All calculations are for guidance only. Consult your veterinarian before implementing strict weight loss plans to prevent feline hepatic lipidosis.
Frequently Asked Questions
What is RER for cats and how is it calculated? ▼
Resting Energy Requirement (RER) is the basal energy a cat consumes at rest. For cats weighing between 2 kg and 10 kg, standard veterinary nutrition uses RER = 70 × (Body Weight in kg)^0.75.
How many calories does an average house cat need per day? ▼
An average neutered adult indoor cat weighing 4 kg (8.8 lbs) requires approximately 180 to 200 kcal per day to maintain healthy body condition.
How many calories should a kitten or pregnant cat eat? ▼
Growing kittens require 2.0 to 2.5 times their basic RER. Pregnant or lactating queens require 2.0 to 6.0 times their basal RER to support developing kittens and milk production.