Maintenance Energy Requirements (MER) Calculator for Cats 

Introduction 

Nutrition is a crucial factor in maintaining the health of pets. It can contribute to longer, healthier lives and lower the risk of certain health issues. Feeding the correct diet in the appropriate amount is essential. Pets should be fed to maintain an ideal body condition. Estimates of Maintenance Energy Requirement (MER) (which provides a “daily calorie allowance”) or feeding recommendations on pet food labels based on the pet’s weight can provide a starting guideline for how much to feed.  

Using the MER Calculator for Cats 
Numerous equations are available to estimate MER. Each equation may yield a different estimate, but all are based on the needs of an “average” dog or cat. However, individual pets’ needs can vary. The (MER) calculator for cats is an interactive tool designed to help you easily and quickly calculate the daily caloric needs of your pet, taking into account its individual needs. It provides tailored nutritional recommendations based on the following factors: 

  • Age group (1–6, 7–11, 12–15, and 15+ years of age) 
  • Weight 
  • Body Condition Score, a subjective and semi-quantitative method that uses visual and palpable characteristics to assess body fat and estimate a pet’s optimal body weight, regardless of breed or body size 
  • Weight goal (maintain or not maintain weight) 

Check out this video demonstrating how to use the calculator. 

MER and Weight Loss 

During development of a weight loss plan for an overweight or obese pet, MER can be calculated based on the pet’s current body weight or on target body weight. When making MER recommendations, it is important to note that drastic calorie restriction increases the risk of creating nutrient deficiencies, so obese pets should be monitored closely during weight loss. Rather than rapid weight loss, gradual loss, i.e., 0.5% up to 1–2% of body weight per week for cats, helps maintain lean body mass, mitigate rebound weight gain, and reduce the risk of hepatic lipidosis. 

Read more in the Nutritional and Behavioral Strategies for Preventing and Managing Excess Weight monograph. 

MER and Aging 
Remember, as cats age, their caloric needs will evolve. While adult cats show a decrease in energy requirement up to about 12 years, energy requirements for cats over 12 years of age may increase due, at least in part, to a reduced ability to digest fat and protein. Regularly reassessing daily caloric needs using tools like the MER calculator is essential for preventing obesity or malnutrition. 

Learn more about Feeding Senior Cats.