Quick answer: Most adult cats need 200 to 250 calories per day. For a 10 lb indoor cat, that works out to roughly one and a half 5.5 oz cans of wet food, or one third of a cup of dry kibble, or a combination of both split across two meals daily. But weight, age, breed, and health status all shift those numbers significantly. This guide walks you through every variable.
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How Much Should Your Cat Eat?
Enter your cat's details below for a personalized daily feeding plan, including exact wet food, dry kibble, and meal timing recommendations.
Feeding a cat sounds simple. Fill the bowl, walk away. In reality, feline nutrition is surprisingly nuanced, and getting it wrong has real consequences. Cats that are overfed even slightly over months and years develop obesity, diabetes, and joint disease. Cats that are underfed lose muscle mass and become immune-compromised. The difference often comes down to a few dozen calories per day.
This guide gives you the tools to get it right: the actual numbers, the science behind them, and a framework you can adapt to your specific cat.
How Many Calories Does a Cat Need Per Day?
Veterinary nutritionists calculate a cat's daily energy needs using a formula called the Resting Energy Requirement, or RER. It looks like this: RER = 70 multiplied by the cat's weight in kilograms raised to the power of 0.75. That baseline number is then multiplied by a life-stage factor that accounts for age, reproductive status, and activity level.
In practical terms, here is what that produces for the most common cat weights:
| Cat Weight | Daily Calories | Wet Food | Dry Kibble | Mixed (60/40) |
|---|---|---|---|---|
| 6 lbs (2.7 kg) | 150 to 180 kcal | ~1 can (5.5 oz) | ~1/8 cup | 1 can + 1/8 cup |
| 8 lbs (3.6 kg) | 180 to 220 kcal | ~1.5 cans | ~1/4 cup | 1 can + 1/4 cup |
| 10 lbs (4.5 kg) | 200 to 250 kcal | ~1.5 to 2 cans | ~1/3 cup | 1.5 cans + 1/4 cup |
| 12 lbs (5.4 kg) | 240 to 300 kcal | ~2 cans | ~1/3 to 1/2 cup | 1.5 cans + 1/3 cup |
| 15 lbs (6.8 kg) | 280 to 350 kcal | ~2.5 cans | ~1/2 cup | 2 cans + 1/3 cup |
These figures assume a healthy, neutered adult cat living indoors. Outdoor cats, unneutered cats, and very active cats can need 20 to 40 percent more. Overweight cats should be fed toward the lower end while any reduction is gradual and supervised.
Pro tip: Measuring cups are notoriously inaccurate for dry kibble because the density varies between brands. Use a kitchen scale and weigh grams instead of eyeballing cup measurements. It takes ten seconds and makes a genuine difference over time.
Wet Food Portions: How Much and How Often
Wet food is the gold standard for feline hydration. Cats evolved in arid environments and have a naturally low thirst drive, meaning they instinctively get most of their water from prey. A diet heavy in wet food replicates that biology. Standard 5.5 oz cans contain roughly 70 to 100 calories and approximately 75 percent moisture.
Portion guidelines for wet food
- Feed one 5.5 oz can per 6 to 8 lbs of body weight daily as a starting point
- Split the daily total into two meals, morning and evening, roughly 10 to 12 hours apart
- Discard uneaten wet food after 30 minutes to prevent bacterial growth
- Serve at room temperature rather than cold from the fridge to improve palatability
- Store opened cans covered in the refrigerator for no more than 48 hours
Cats with kidney disease, urinary tract issues, or diabetes benefit most from high wet food intake. The moisture supports kidney filtration, reduces the concentration of urine that can form crystals, and helps manage blood sugar alongside a high-protein, low-carbohydrate formula.
Dry Kibble Portions: When and How Much
Dry kibble is calorie-dense, convenient, and genuinely useful for dental health. The mechanical action of chewing crunchy kibble reduces tartar buildup and slows the progression of periodontal disease, which affects the majority of cats over three years old. The tradeoff is moisture: kibble contains only about 10 percent water, so cats eating primarily dry food need reliable access to fresh water at all times.
Portion guidelines for dry food
- Start with one quarter to one third of a cup per day for a 10 lb cat
- Check the feeding guide on your specific bag since calorie density varies significantly by brand
- Free-feeding works only if your cat self-regulates, which many do not
- For cats prone to weight gain, measure every meal and put the bowl away after 20 minutes
- Consider a puzzle feeder or slow-feed bowl to reduce the speed of eating and prevent vomiting
Important: Free-feeding dry kibble is the most common driver of feline obesity. If your cat grazes all day and has gained weight over the past year, switching to measured twice-daily meals is often the single most effective intervention, before any food change.
Wet Food vs. Dry Food: Which Is Better?
Both food types have genuine advantages. The answer depends heavily on your cat's individual health profile.
Choose wet food if your cat:
- Has a history of urinary tract infections or kidney disease
- Does not drink much water independently
- Is diabetic and needs blood sugar management through diet
- Is a senior cat with decreased kidney function
- Is a picky eater who needs palatability encouragement
Choose dry food if your cat:
- Has significant dental disease and needs the mechanical cleaning benefit
- Eats on an unpredictable schedule that makes timed wet food impractical
- Genuinely self-regulates and maintains a healthy weight on free-fed kibble
- Is a high-energy outdoor cat who needs calorie-dense fuel throughout the day
The vet-backed answer for most cats: both.
A mixed diet of 60 to 70 percent wet food and 30 to 40 percent dry food gives the best of both worlds. Wet food provides essential hydration and prevents urinary issues. Dry food supports dental health and provides convenience. Use the wet food as your primary meal base and dry kibble as a midday supplement or dental aid.
If your budget allows only one, wet food is the more important choice for long-term feline health in most cats. Hydration has downstream effects on nearly every major organ system.
How to Adjust Portions for Age, Breed, and Health
The standard calorie tables are useful baselines, but they were built for the average domestic shorthair living an average life. Real cats deviate from averages constantly. Here is how to adjust.
Kittens (under 12 months)
Kittens need two to three times the calories per pound of body weight compared to adult cats. Their metabolism runs fast to fuel rapid organ and muscle development. Feed kitten-specific formulas with at least 30 percent protein on a dry matter basis, divided into three to four meals per day. Do not restrict intake for kittens under six months unless specifically directed by a vet.
Senior cats (7 years and older)
Seniors have a reduced ability to absorb protein even when their intake looks adequate. This means older cats need higher protein content in their food, not less. Switch to senior-formulated wet food with easily digestible protein sources. Feed smaller meals more frequently as the digestive system becomes less efficient with age.
Large breeds like Maine Coons and Ragdolls
These cats can reach 15 to 20 lbs at a healthy weight and need proportionally more calories. Use the weight-based formula rather than a flat recommendation. Look for formulas designed for large breeds that account for their slower metabolism per pound compared to smaller cats.
Neutered and spayed cats
Neutering reduces a cat's metabolic rate by approximately 20 to 30 percent almost immediately after surgery. Many owners continue feeding pre-neuter amounts and wonder why their cat gradually gained weight. Reduce portions by about 20 percent within the first few weeks of neutering and monitor weight monthly going forward.
Overweight cats
Never reduce a cat's food by more than 20 to 25 percent at once. Cats that are underfed relative to recent intake can develop hepatic lipidosis, a life-threatening liver condition, within days. Aim for a loss of 0.5 to 1 percent of body weight per week maximum. Your vet can help calculate a precise target.
Building a Daily Feeding Schedule
Cats are creatures of habit. A consistent schedule reduces anxiety, prevents begging, and makes it much easier to notice when a cat's appetite has changed, which is often the first sign of illness.
- 7:00 to 8:00 AM: Serve 50 percent of the daily wet food portion as the main morning meal
- 12:00 PM (optional): Leave a small measured amount of dry kibble for midday grazing, especially for active or high-energy cats
- 6:00 to 7:00 PM: Serve the remaining 50 percent of wet food as the evening meal
- Monitor the bowl: Remove uneaten wet food after 30 minutes and rinse the bowl before the next meal
For kittens under six months, add a third meal around midday. For diabetic cats, feed precisely two meals timed to match insulin injections as directed by your veterinarian.
Traveling or irregular schedule? An automatic timed feeder can maintain meal consistency even when you cannot. Look for models with portion control and a sealed compartment to keep wet food fresh until the scheduled release time.