How much food you should give your cat is a critical question for their health. Overfeeding leads to obesity, while underfeeding leads to malnutrition. In this guide, you will learn how to calculate the correct portion amount based on your cat's individual needs.
1. Calculating Daily Calorie Needs
1.1 Basic Formula: RER (Resting Energy Requirement)
The energy requirement of a cat at rest:
Example: For a 4 kg cat, RER = 70 × 4^0.75 = 70 × 2.83 = 198 kcal/day
1.2 Activity Factor (MER)
For actual daily requirement, multiply RER by the activity factor:
| Condition | Factor | For a 4 kg cat |
|---|---|---|
| Neutered (indoor cat) | 1.2 | 238 kcal |
| Not neutered (indoor cat) | 1.4 | 277 kcal |
| Active/outdoor | 1.6 | 317 kcal |
| Weight loss goal | 0.8 | 158 kcal |
| Weight gain goal | 1.8 | 356 kcal |
| Kitten (4-12 months) | 2.0-2.5 | 396-495 kcal |
| Pregnant (last 3 weeks) | 1.6-2.0 | 317-396 kcal |
| Nursing | 2.0-6.0 | 396-1188 kcal |
2. Quick Portion Table by Weight
2.1 Dry Food (Average 350-400 kcal/100g)
| Cat Weight | Neutered (indoor) | Active | Kitten |
|---|---|---|---|
| 2 kg | 30-35g | 40-45g | 50-60g |
| 3 kg | 40-45g | 50-55g | 65-80g |
| 4 kg | 50-55g | 60-70g | 80-100g |
| 5 kg | 55-65g | 70-80g | 95-120g |
| 6 kg | 65-75g | 80-90g | - |
| 7 kg | 70-80g | 85-100g | - |
2.2 Wet Food (Average 80-100 kcal/100g)
| Cat Weight | Neutered (indoor) | Active |
|---|---|---|
| 2 kg | 150-180g | 200-220g |
| 3 kg | 200-230g | 260-290g |
| 4 kg | 250-280g | 320-350g |
| 5 kg | 290-330g | 370-410g |
| 6 kg | 330-370g | 420-470g |
2.3 Mixed Feeding (Dry + Wet)
Example: 4 kg neutered cat, 250 kcal daily requirement
- Morning: 100g wet food (~90 kcal)
- Evening: 40g dry food (~160 kcal)
- Total: ~250 kcal ✓
3. Special Situations by Age
3.1 Kittens (0-12 months)
Because kittens grow rapidly, they need 2-3 times more calories than adults:
| Age | Number of Meals | Portion Note |
|---|---|---|
| 2-3 months | 4-5 | Free feeding or frequent small meals |
| 3-6 months | 3-4 | Upper limit of package recommendation |
| 6-12 months | 2-3 | Slow transition to adult portions |
3.2 Senior Cats (7+ years)
- Metabolism slows down → Calorie need decreases by 20-30%
- However, protein need does NOT decrease
- Reduce portion size, increase quality
3.3 Neutered Cats
- Metabolism slows by 20-25%
- Appetite may increase
- Portion control is critical
- Choose neutered cat food (low calorie)
4. How to Measure the Correct Portion?
4.1 Use a Kitchen Scale
Estimating by eye DECEIVES! Research shows that 50% of cat owners estimate portions incorrectly.
4.2 Use of Measuring Cup
Use the measuring cup provided by the food brand. Different foods have different densities!
5. Free Feeding vs. Controlled Feeding
5.1 Free Feeding (Ad Libitum)
Advantages:
- Cat eats whenever they want
- Practical
Disadvantages:
- High risk of obesity
- Difficult to track consumption
- Problematic in multi-cat households
5.2 Controlled Feeding (Recommended)
Advantages:
- Portion control
- Noticing changes in appetite
- Weight management
6. Body Condition Score (BCS)
Is the portion correct? Check your cat's body condition:
| Score | Condition | Signs | Action |
|---|---|---|---|
| 1-3 | Thin | Ribs are clearly visible, waist is very prominent | Increase portion, vet check-up |
| 4-5 | Ideal | Ribs easily felt, slight waist tuck | Continue |
| 6-7 | Overweight | Ribs difficult to feel, waist indistinct | Reduce portion by 10-15% |
| 8-9 | Obese | Ribs not felt, hanging belly | Veterinary diet, reduce by 20-30% |
7. Common Mistakes
7.1 Following Package Recommendations Blindly
Recommendations on the package are usually for active, non-neutered cats. For neutered indoor cats, reduce by 20-30%.
7.2 Not Accounting for Treats
Treats also contain calories! Max 10% of daily calories should come from treats.
7.3 Feeding by Multiple People
Family members must be coordinated. If everyone feeds separately, obesity is inevitable!
8. Practical Calculation Example
Scenario: 5 kg, neutered, indoor cat
Step 1: RER = 70 × 5^0.75 = 70 × 3.34 = 234 kcal
Step 2: MER = 234 × 1.2 (neutered factor) = 281 kcal/day
Step 3: Food calorie value: 380 kcal/100g (look at the package)
Step 4: Daily portion = 281 ÷ 380 × 100 = 74g dry food
Step 5: Divide into 2 meals = Morning 37g + Evening 37g
Conclusion
Correct portioning is the key to maintaining your cat's healthy weight. Use a kitchen scale, check body condition regularly, and adjust according to individual needs.
Remember: Every cat is an individual. Package recommendations are a starting point; adjust according to your cat's condition.
References
AAHA. (2021). AAHA Nutrition and Weight Management Guidelines for Dogs and Cats. JAAHA.
Laflamme, D. P. (1997). Development and validation of a body condition score system for cats. Feline Practice, 25(5-6), 13-18.
NRC. (2006). Nutrient Requirements of Dogs and Cats. National Academies Press.
German, A. J. (2006). The growing problem of obesity in dogs and cats. The Journal of Nutrition, 136(7), 1940S-1946S.
WSAVA. (2011). Global Nutrition Guidelines. World Small Animal Veterinary Association.