How Much to Feed a Cat: Weight-Based Feeding Chart

By Sarah Bennett, Certified Animal Nutritionist

Ask a dozen cat owners how much they feed their cats, and you'll get a dozen different answers — most of them guesses. "A handful," "half a tin," "whatever the bag says." It's understandable: cat food labels give wide ranges, cats are notorious for begging convincingly, and the consequences of overfeeding (weight gain, diabetes, joint disease) build slowly and silently. Getting the quantity right is one of the most impactful things you can do for your cat's long-term health.

Why Feeding Amounts Matter More Than You Think

Cats have a narrow caloric window. A 4 kg adult indoor cat requires approximately 240–280 kilocalories per day. An extra 10 grams of dry food each day — barely a tablespoon — adds roughly 35 kcal. Over a year, that's a surplus of nearly 13,000 kcal, enough to add approximately 1–1.5 kg of body weight to a cat that should weigh 4 kg. That represents a 25–37% weight gain from what appears to be a trivial daily surplus.

The food industry's bag guidelines are also notoriously unreliable. They are often based on the needs of active, unspayed/unneutered cats and tend to overestimate requirements for the typical indoor, spayed or neutered adult. Use them as a starting point, not gospel.

Weight-Based Feeding Chart

The table below provides estimated daily feeding amounts based on your cat's body weight. These figures apply to typical adult cats (1–7 years, spayed/neutered, indoor lifestyle) and assume a standard commercial wet food at approximately 80–100 kcal per 100g and a standard dry food at approximately 350–400 kcal per 100g. Adjust based on your specific product's caloric density, which should be listed on the packaging.

Note: If feeding a combination of wet and dry food, reduce each proportionally. For example, for a 4 kg cat: 115g wet food (half the wet allowance) plus 35g dry food (half the dry allowance) provides approximately the right caloric total. Always verify the kcal/100g on your specific product label.

Wet Food vs Dry Food: Caloric Density and Hydration

Wet food and dry food are not interchangeable volume-for-volume — their caloric density differs dramatically. Wet food typically contains 70–80% moisture, which means a 200g portion delivers far fewer calories than 200g of dry kibble (which contains only 8–12% moisture). This is why the recommended grams of wet food per day are so much higher than dry food amounts.

From a health standpoint, wet food carries significant advantages for cats. Cats evolved to obtain most of their water from prey, not from a separate water bowl. Many cats are chronically mildly dehydrated when fed exclusively dry food, which contributes to urinary tract disease, kidney stress, and constipation over time. A diet that is predominantly wet or includes substantial wet food is considered more physiologically appropriate by most veterinary nutritionists.

Dry food is not harmful, but if used as the sole diet, encourage water intake through cat fountains and multiple water stations around the home.

Life Stage Adjustments

Kittens (under 12 months): Kittens need roughly double the calories per kilogram of body weight compared to adults. They should be fed a kitten-specific formula and allowed to eat more freely, particularly in the first six months. Divide daily rations into 3–4 small meals.

Adult cats (1–7 years): The table above applies. Spayed and neutered cats have lower energy requirements than intact cats — reduce the amounts by approximately 10–15% post-neutering and monitor weight monthly for the first three months.

Senior cats (7+ years): Older cats often have reduced digestive efficiency and may need slightly more protein (not less) to maintain muscle mass, even as their caloric needs may decrease. Senior cats can also develop hyperthyroidism, kidney disease, or dental problems that affect appetite and absorption. Regular vet check-ups every six months are strongly recommended.

Pregnant or nursing cats: Caloric needs can increase by 50–100% during late pregnancy and peak lactation. Feed queen-appropriate food (kitten formula is often used) ad libitum during nursing — restricting food during this period risks both the mother's health and milk production.

Indoor vs Outdoor Activity Adjustment

The chart above is calibrated for indoor cats with low to moderate activity. Outdoor cats or those with access to large spaces, frequent play, or hunting activity may require 20–30% more calories. Conversely, a very sedentary indoor cat — particularly one that sleeps most of the day — may need 10–15% less than the chart suggests. Use the chart as a starting point and let your cat's body condition guide adjustments.

How to Assess Body Condition Score

The gold standard for evaluating whether your cat is eating the right amount is the Body Condition Score (BCS), a 1–9 scale used by veterinarians. An ideal score is 4–5 out of 9. At this score, you can feel the ribs easily without pressing hard, the waist is visible from above, and there is a slight abdominal tuck when viewed from the side. A score of 6–7 indicates overweight; 8–9 indicates obesity. Scores of 1–3 indicate underweight, which requires veterinary investigation.

Weigh your cat monthly at home (hold the cat while standing on a bathroom scale, then subtract your own weight) and compare to the previous month. An increase of more than 100–150g per month warrants a feeding reduction and vet check.

References

1. National Research Council. Nutrient Requirements of Dogs and Cats. Washington, DC: The National Academies Press; 2006. Chapter 15: Energy requirements of cats. ISBN: 978-0-309-08628-8.
2. Laflamme DP. Development and validation of a body condition score system for cats: a clinical tool. Feline Practice. 1997;25(5–6):13–18. PMID: 9213203.