1. What is RER and MER?

RER (Resting Energy Requirement) is the number of calories needed for basic bodily functions at rest. MER (Maintenance Energy Requirement) is the total daily calories needed based on activity level and life stage.

2. How Does the Calculator Work?

The calculator uses the following equations:

Where:

• \( weight_{kg} \) — Body weight in kilograms
• \( factor \) — Multiplier based on life stage and activity level

Explanation: The RER equation estimates basal metabolic needs, while the MER adjusts for actual energy requirements based on the pet's condition.

3. Importance of Calorie Calculation

Details: Accurate calorie estimation is crucial for maintaining healthy weight, supporting growth, pregnancy/lactation, and managing weight loss programs.

4. Using the Calculator

Tips: Enter weight in kilograms and select the appropriate life stage/activity level. For weight conversion: 1 kg = 2.2 lbs.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between RER and MER?
A: RER is the minimum calories needed at complete rest, while MER includes calories for normal activity and life stage needs.

Q2: How accurate are these calculations?
A: They provide good estimates but individual needs may vary by ±20%. Monitor weight and adjust as needed.

Q3: What if my pet is overweight?
A: Use the weight loss factors (1.0 for mild, 0.8 for significant weight loss) and aim for 1-2% body weight loss per week.

Q4: Can I use this for all pets?
A: These equations work best for dogs and cats. Other species may require different calculations.

Q5: Should I feed exactly the MER amount?
A: MER is a starting point. Adjust based on body condition score, weight trends, and veterinary advice.