How to Read a Cat Food Label

Most of a cat food package is marketing. Three things on it are genuinely useful: whether the food says "complete", what the ingredient list actually says, and the calorie figure. Everything else — the photography, the descriptive words, the front-of-pack claims — is either regulated so loosely as to mean very little or simply not regulated at all. The most consequential misunderstanding is the analysis percentages: you cannot compare a wet food's protein percentage with a dry food's, because one is roughly 78% water and the other is 8%. This page covers what to look for, in the order it matters. Portion figures once you have the calories are in the cat food calculator.

Check "Complete" First

The single most important word on the packet, and it appears in small print.

"Complete" means the food provides everything a cat needs and can be fed as the sole diet.

"Complementary" means it does not, and is intended to be fed alongside something else. Most treats, toppers, "gravy" side products and many premium-looking pouches fall into this category.

A cat fed only complementary food will develop deficiencies, which is why this is the first check rather than an afterthought.

Where to find it: usually near the feeding guidelines in small text, sometimes on the back or the underside. It is deliberately unglamorous.

Also check the life stage. Foods are formulated for kittens, adults, or all life stages. A kitten needs kitten food; an adult on kitten food is eating a substantially more calorie-dense product than it needs.

And if you feed two foods, both should say complete — then they can be combined in any ratio without creating a gap.

Reading the Ingredient List

Listed heaviest first, and there are two things that regularly mislead.

Ingredients are weighed before cooking. Fresh meat is around 70% water, so "chicken" listed first may contribute far less to the finished food than a dried ingredient listed second. A food listing "chicken" first and "maize" second may end up with more maize by finished weight.

Which is why "meat meal" is not a bad sign. Chicken meal is chicken with the water already removed, so its position in the list reflects its actual contribution. It sounds less appealing and is often the more meaningful entry.

Named is better than unnamed. "Chicken" tells you more than "meat and animal derivatives", which is a legal category covering a range of animal-source material. Unnamed does not mean unsafe — it means unspecified, and it can vary between batches.

"Derivatives" is not automatically poor quality. Organ meats are nutritionally excellent for cats and fall under this heading. The issue is that you cannot tell what you are getting.

Splitting can flatter a list. If a food lists "maize", "maize gluten" and "maize flour" separately, each appears lower down than the combined total would.

What you actually want to see in a cat food: animal protein prominent, since cats are obligate carnivores, and enough of it to be doing real work rather than appearing for the photograph.

The Calorie Figure

The number you cannot portion without, and the one most often missing from the front.

Usually given as kcal per 100 g, sometimes per pouch, per can or per cup. It may be labeled ME (metabolisable energy).

Typical ranges: dry food 320–420 kcal per 100 g; wet pouches roughly 50–100 kcal per 85 g.

That variation is enormous. Two dry foods can differ by 25%, meaning the same scoop delivers very different amounts of energy.

Which is why the portion must be recalculated whenever you change food, and why "he has one cup a day" is not a portion, it is a habit.

If the figure is not on the pack, it is almost always on the manufacturer's website. A brand that does not publish calorie content anywhere is worth being skeptical about.

Then divide. Daily calorie requirement ÷ calories per unit = amount to feed. The method for each type is in how much wet food to feed a cat and how much dry food to feed a cat.

Why Percentages Mislead

The most common analytical mistake, and it makes wet food look far worse than it is.

Wet food is around 75–80% water. Dry food is around 8–10%.

So a wet food showing 10% protein and a dry food showing 32% are not directly comparable. The wet food's percentage is diluted by water that the dry food does not contain.

Convert to dry matter to compare properly. Subtract the moisture from 100 to get the dry matter, then divide the nutrient percentage by that figure.

Worked example. A wet food with 78% moisture and 10% protein: dry matter is 22%, so protein on a dry matter basis is 10 ÷ 22 = about 45%. A dry food with 8% moisture and 32% protein: dry matter is 92%, so 32 ÷ 92 = about 35%.

The wet food has more protein, not less — the opposite of what the front-of-pack percentages suggest.

Do this conversion any time you compare a wet food with a dry one. Within the same category the printed percentages are broadly comparable and no conversion is needed.

What the Naming Rules Actually Allow

Front-of-pack descriptions are regulated, but loosely, and the wording is doing more work than it appears.

"Chicken cat food" or "chicken dinner" generally requires a substantial proportion of chicken.

"With chicken" can mean a much smaller amount — in some regulatory frameworks as little as 4%.

"Chicken flavor" can mean there is barely any chicken at all, only enough to be detectable.

So a pouch showing a chicken breast on the front and reading "with chicken" may be mostly something else.

The fix is simply to read the ingredient list rather than the front. The percentage of the named ingredient is often given in brackets there.

Words with no regulated meaning at all in most markets include premium, gourmet, natural, holistic, human-grade and super-premium. They are marketing terms and tell you nothing verifiable.

"Grain-free" is a real description but not automatically a benefit — most cats have no issue with grains, and grain-free foods simply substitute other carbohydrates. The detail is in grain-free cat food explained.

Nutrients Cats Specifically Need

A few that are worth knowing, because cats differ from other pets.

Taurine. An amino acid cats cannot synthesise in adequate amounts. Deficiency causes serious heart and eye disease. Every complete cat food includes it, which is another reason "complete" is the first check — and it is why dog food is unsuitable for cats, since dog food is not required to contain it.

Arachidonic acid, a fatty acid cats also cannot make in sufficient quantity from plant sources.

Preformed vitamin A. Cats cannot convert beta-carotene from plants the way many species can, so they need vitamin A from animal sources.

High protein. Cats are obligate carnivores with a continuous requirement for protein, and they use it differently from omnivores. The practical implications are in high-protein cat food explained.

Which is the underlying reason cats should not be fed vegetarian or vegan diets without veterinary supervision, and should never be fed dog food as a substitute.

Life stage matters here too. Kitten formulations carry more of several of these, and senior formulations vary considerably between brands — the picture is in best food for senior cats.

What to Ignore

Being clear about this saves a lot of time in the aisle.

The photograph. It shows serving suggestions, not contents.

"Premium", "gourmet", "natural", "holistic". No regulated meaning.

"No artificial colors". Colors are for the human buying it; cats do not care and their absence is not a nutritional benefit.

Long ingredient lists as a proxy for quality. More ingredients is not better or worse.

"Vet recommended" without specifics.

Single ingredients on the front. Read the list, not the headline.

And be careful with "no fillers". Filler has no regulatory definition, and ingredients described that way are often carbohydrates that serve a real function in the food.

What to read instead: complete, life stage, ingredient list, calorie figure, and — if the cat has a specific issue — the analysis converted to dry matter. Foods for particular problems, such as cat food for sensitive stomachs, are worth choosing on the specifics rather than the label language.

Comparing Cost Properly

A label skill worth having, because shelf prices are close to meaningless on their own.

Price per kilogram is misleading across wet and dry, for exactly the same reason percentages are: you are largely paying for water in one and not the other.

Compare cost per calorie instead. Divide the pack price by the total calories in the pack.

Worked example. A 2 kg bag of dry food at 380 kcal per 100 g contains 7,600 kcal. A box of twelve 85 g pouches at 70 kcal each contains 840 kcal. If the bag and the box cost the same, the dry food is delivering roughly nine times the energy.

Which is why an all-wet diet costs several times what an all-dry one does, and why combination feeding is such a common landing point.

Also compare cost per day, which is the number that actually affects your budget. Take your cat's daily calorie requirement and divide by the food's calories per gram, then multiply by the price per gram.

And be skeptical of large packs. Dry food goes stale once opened as the fat coating degrades, so a large bag that takes a single cat two months to finish is a false economy — the last third often gets refused.

Multipacks of wet food are only cheaper if your cat reliably eats every flavor in the box, which is worth checking before committing to a large one.

Frequently Asked Questions

What does "complete" mean on cat food?

That the food provides everything a cat needs and can be fed as its only food. "Complementary" means it cannot — it is intended to be fed alongside something else, and a cat fed only complementary food will develop deficiencies.

Why is the protein percentage lower on wet cat food?

Because wet food is around 78% water, which dilutes every percentage on the label. Converted to a dry matter basis, wet foods often contain more protein than dry ones, not less.

How do I compare wet and dry cat food?

Convert both to a dry matter basis. Subtract the moisture percentage from 100 to get dry matter, then divide the nutrient percentage by that figure. Only then are the two comparable.

Does "with chicken" mean the food is mostly chicken?

No. Naming rules allow "with chicken" to describe a food containing a small proportion — in some markets as little as 4%. Read the ingredient list, where the percentage is often given in brackets.

Are meat derivatives bad in cat food?

Not necessarily. The category includes organ meats, which are nutritionally excellent for cats. The drawback is that "derivatives" is unspecified, so you cannot tell what you are getting or whether it varies between batches.

Where do I find the calories on cat food?

Usually on the back or side as kcal per 100 g, sometimes per pouch or can, occasionally labeled ME. If it is not on the pack, it is almost always on the manufacturer's website — and you need it to work out a portion.

Three checks cover almost everything useful on a cat food label: does it say complete, what does the ingredient list actually say once you allow for pre-cooking weight, and what is the calorie figure. Convert percentages to a dry matter basis before comparing a wet food with a dry one, read the ingredient list rather than the front of the pack, and ignore the unregulated adjectives entirely. Once you have the calorie number, the free cat food calculator turns it into a daily portion.