Cat Resting Energy Calculator
Here’s a comprehensive table summarizing all you need to know about cat resting energy:
| Factor | Formula/Value | Description |
|---|---|---|
| Resting Energy Requirement (RER) | 30 x (body weight in kg) + 70 | Calculates energy required at rest2 |
| Maintenance Energy Requirement (MER) for neutered adult | 1.2 x RER | Energy needed for maintenance4 |
| MER for intact adult | 1.4 x RER | Energy needed for maintenance4 |
| Basal Metabolic Rate (BMR) | 0.75 x body weight (kg) x 70 | Used to estimate basic energy needs |
| Daily Energy Requirement (DER) for growing kittens | 2.5 x RER | Energy needed for growth4 |
| DER for obese-prone cats | 1.0 x RER | Energy needed for weight management4 |
| DER for weight loss | 0.8 x RER | Energy needed for weight loss4 |
| Alternative RER calculation | 70 x (body weight in kg)^0.75 | More accurate for very small or large cats14 |
| Simplified ME for active cats | 60 x BW | Where BW is body weight in kg5 |
| Simplified ME for older/inactive cats | 45 x BW | Where BW is body weight in kg5 |
Additional Considerations
- Metabolic Weight (MW): MW = BW^0.67 (where BW is body weight in kg). This is often used for more precise energy calculations5.
- NRC Recommendation: ME = 100 x BW^0.67. However, this may overestimate calorie needs by up to 50%5.
- Alternative for less active/neutered cats: ME = 75 x BW^0.675.
- Factors Affecting Energy Requirements:
- Age
- Sex
- Reproductive status (intact or neutered)
- Body composition (lean or fat)
- Activity level
- Environmental temperature5
- Energy Density of Food: The amount of nutrients in food depends on its energy density. Cats typically stop eating when they’ve reached their daily energy requirement5.
Remember that these formulas provide estimates, and individual cats may have different needs based on their specific circumstances. Always consult with a veterinarian for personalized dietary advice.