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Cat MER Calculator Library

Proper nutrition plays a vital role in ensuring the health and well-being of our feline companions. To accurately determine a cat’s maintenance energy requirements (MER), the Cat MER Calculator library serves as a reliable tool. This article aims to provide insights into understanding cat energy requirements and how the Cat MER Calculator library can be used to create your own tools to calculate them.

Fediaf Nutritional Guidelines

The Cat MER Calculator library bases its calculations on the Fediaf Nutritional Guidelines. These guidelines, established by the European Pet Food Industry Federation, are widely recognized and respected in the field of feline nutrition. By aligning with these guidelines, the Cat MER Calculator library ensures accurate and optimal energy recommendations for cats.

Understanding Cat Energy Requirements

Several factors influence a cat’s daily energy requirements. Understanding these factors is crucial for providing tailored nutrition. Here are some key considerations:

  • Weight: A cat’s weight directly affects its energy needs. Overweight and underweight cats require different calorie intakes to maintain or achieve a healthy weight.
  • Age: Energy requirements change as cats progress through different life stages. Kittens, adult cats, and senior cats have varying needs.
  • Activity Level: The level of physical activity also impacts energy requirements. Indoor and outdoor cats have different activity levels, and their diets should reflect this.
  • Unique Circumstances: Factors like neutering, lactation, and pregnancy require adjustments to a cat’s diet to support their specific needs.

The Cat MER Calculator Library

The Cat MER Calculator library is a user-friendly library that simplifies the process of calculating cat energy requirements. Here’s what you need to know:

  • Purpose: The Cat MER Calculator library assists cat owners and professionals in determining precise energy recommendations for their feline companions.
  • Functionality: By providing essential inputs such as weight, age, and activity level, the library generates personalized energy intake suggestions.
  • Ease of Use: The user-friendly interface of the Cat MER Calculator library ensures accessibility and convenience for cat owners seeking accurate energy calculations for their cats.

To explore and utilize the Cat MER Calculator library, visit the npmjs package page. On HuiskattenInfo.nl you can find een live example here (In Dutch).


The MerCalculator library is released under the MIT license, which grants users the freedom to use, modify, and distribute the software. While the license allows for individual choices regarding proprietary modifications, we encourage users to embrace the spirit of openness and collaboration by making their derived tools freely available to benefit the wider community. The source code is available at Github.

Application in Real Life

The Cat MER Calculator library finds practical application in various real-life scenarios:

  • Pregnancy: During pregnancy, it is crucial to provide the mother cat with adequate energy intake. The Cat MER Calculator library helps determine the optimal dietary adjustments for a pregnant cat to support both the mother and her unborn kittens.
  • Lactation: Lactating cats require increased energy to produce milk and support nursing kittens. The Cat MER Calculator library aids in calculating the additional energy requirements for lactating cats, ensuring their nutritional needs are met.
  • Neutering: After neutering, cats’ energy requirements change, and adjustments to their diet become necessary to prevent obesity. The Cat MER Calculator library assists in determining the appropriate energy intake to maintain a healthy weight post-neutering.


Understanding cat energy requirements is essential for providing cats with a balanced and tailored diet. The Cat MER Calculator library, with its reliance on the Fediaf Nutritional Guidelines and precise calculations, is a valuable resource for cat owners. By utilizing this user-friendly tool, cat owners can ensure their feline companions receive the optimal energy intake needed for their specific circumstances. For accurate energy recommendations and enhanced feline nutrition, embrace the power of the MerCalculator library.

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