RER Resting Energy Requirement Calculator


Calculating the resting energy requirement (RER) of a pet is essential for ensuring proper nutrition and health management. By determining the amount of energy an animal needs at rest, owners and veterinarians can tailor their diet and care accordingly. This article presents a simple yet accurate RER calculator along with an explanation of its usage and formula.

How to Use

To utilize the RER calculator, follow these steps:

  1. Input the weight of the animal in kilograms.
  2. Select the appropriate activity level from the provided options.
  3. Click the “Calculate” button to obtain the resting energy requirement.


The Harris-Benedict equation is commonly used to estimate resting energy expenditure. The formula for calculating RER is as follows:

Example Solve

Let’s consider a 10 kg dog with a sedentary lifestyle:


Q: What is the Harris-Benedict equation?
A: The Harris-Benedict equation is a formula used to estimate the basal metabolic rate (BMR) and, by extension, resting energy expenditure.

Q: How accurate is the RER calculator?
A: The RER calculator provides a reliable estimate based on the Harris-Benedict equation. However, individual variations in metabolism and health conditions may affect its accuracy.

Q: Can this calculator be used for all animals?
A: While the Harris-Benedict equation is commonly applied to dogs and cats, it may not be suitable for all species. Consult a veterinarian for specific nutritional recommendations.


The RER calculator offers a convenient way to determine the resting energy requirement of pets, aiding in their nutritional management. By understanding and utilizing this tool effectively, pet owners can promote their companions’ well-being and longevity.

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