Calculate the right amount of food for your cat based on weight, age, and activity level
Proper nutrition is essential for your cat's health and longevity. Cats are obligate carnivores, requiring a diet high in protein and specific nutrients like taurine. The amount of food your cat needs depends on several factors including weight, age, activity level, and overall health. This calculator uses the Resting Energy Requirement (RER) formula combined with activity multipliers to determine your cat's daily caloric needs.
| Life Stage | Age Range | Meals Per Day | Calorie Multiplier |
|---|---|---|---|
| Kitten | 0-12 months | 3-4 meals | 2.5x RER |
| Adult (Low Activity) | 1-10 years | 2 meals | 1.2x RER |
| Adult (Moderate) | 1-10 years | 2 meals | 1.4x RER |
| Adult (High Activity) | 1-10 years | 2-3 meals | 1.6x RER |
| Senior | 10+ years | 2-3 meals | 1.1x RER |
Dry food is convenient, cost-effective, and helps maintain dental health. It typically contains 300-400 calories per cup and has a longer shelf life. However, it has lower moisture content, so ensure your cat drinks plenty of water. Dry food is ideal for free-feeding or cats who prefer to graze throughout the day.
Wet food provides high moisture content (70-80%), which helps with hydration and urinary health. It's more palatable for picky eaters and easier to digest. A standard 3oz can contains 70-100 calories. Wet food is beneficial for cats with kidney issues or those who don't drink enough water.
Combining dry and wet food offers the benefits of both. A common approach is feeding wet food in the morning and evening, with dry food available for snacking. This provides variety, ensures adequate hydration, and can help prevent food boredom.
Your cat's body condition significantly impacts food needs. Underweight cats need 20% more calories to gain weight safely. Overweight cats should receive 20% fewer calories for gradual weight loss. Ideal body condition shows a visible waist, ribs that can be felt but not seen, and minimal abdominal fat.
Indoor cats typically need fewer calories than outdoor cats. Active cats who play frequently or have outdoor access burn more energy. Senior cats often become less active and require fewer calories to prevent weight gain. Adjust portions based on your cat's lifestyle and energy expenditure.
Medical conditions like diabetes, kidney disease, or hyperthyroidism affect nutritional needs. Cats recovering from illness or surgery may need more calories. Always consult your veterinarian for specific dietary recommendations if your cat has health issues.
Spayed and neutered cats have lower metabolic rates and may need 20-30% fewer calories than intact cats. Monitor weight closely after surgery and adjust portions to prevent obesity, which is common in altered cats.
Adult cats thrive on 2-3 meals per day at consistent times. This routine helps regulate digestion and prevents overeating. Kittens need more frequent meals (3-4 times daily) due to their high energy needs. Avoid free-feeding unless your cat self-regulates well, as it can lead to obesity.
Use measuring cups for accuracy rather than estimating portions. Food packaging guidelines are starting points but may not suit your individual cat. Monitor body condition weekly and adjust portions by 10-15% if weight changes occur. Gradual adjustments prevent digestive upset.
When changing food types or brands, transition gradually over 7-10 days. Start with 25% new food mixed with 75% old food, increasing the new food proportion every 2-3 days. This prevents digestive issues like diarrhea or vomiting.
Cats need constant access to fresh, clean water. Place multiple water bowls around your home, especially if feeding primarily dry food. Some cats prefer running water from fountains. Adequate hydration supports kidney function and prevents urinary issues.
10 lb adult cat, low activity, ideal weight, dry food only
RER: 70 × (10^0.75) = 394 kcal
Daily needs: 394 × 1.2 = 473 kcal
Dry food: 473 ÷ 350 = 1.35 cups per day
Split into 2 meals: 0.68 cups twice daily
8 lb adult cat, high activity, ideal weight, mixed feeding
RER: 70 × (8^0.75) = 334 kcal
Daily needs: 334 × 1.6 = 534 kcal
Mixed feeding (50/50):
Dry: 0.76 cups per day
Wet: 3.1 cans (3oz) per day
12 lb senior cat, low activity, ideal weight, wet food only
RER: 70 × (12^0.75) = 447 kcal
Daily needs: 447 × 1.1 = 492 kcal
Wet food: 492 ÷ 85 = 5.8 cans per day
Split into 3 meals: 2 cans per meal