A cat food label is dense with figures, and few of them can be compared at a glance. Protein looks high on a dry food and low on a wet one, though it may be the other way round. The feeding chart is written for an average cat. The calories, the one number you need to feed correctly, are often missing from the front and sometimes hard to find at all. This guide takes the label of an ordinary cat food apart panel by panel, shows how to put wet and dry foods on the same footing and walks through a calorie estimate for both. For the dog version, see how to read a dog food label; this guide is for cats.
The panels on a label
| Panel | What it tells you | What to watch |
|---|---|---|
| Product name and claims | Marketing and the type of food | Names have rules about ingredient percentages, but “natural” or “premium” has no feeding value |
| Guaranteed analysis | Minimum crude protein and fat, maximum crude fibre and moisture | As sold, not dry matter |
| Ingredient list | Ingredients by weight, heaviest first | Weight includes water, so fresh meat looks high |
| Nutritional adequacy statement | Complete and balanced for which life stage | “Intended for intermittent feeding” means not complete |
| Calorie statement | kcal per kg or per cup/can | Not always present |
| Feeding guide | Suggested amounts by weight | A starting point only |
The adequacy statement matters most for a cat’s main food, since cats have specific nutrient needs. Look for wording that the food is complete and balanced for adult maintenance, growth or all life stages. A treat or topper may not be complete; see how many treats a cat can have.
The guaranteed analysis
The percentages are as sold, including water. A dry food holds about 8 to 10% moisture and a wet food 75 to 82%. So you cannot compare protein of 40% on a dry food with 10% on a wet food: the wet food has far less water-free matter per 100 g.
Convert to dry matter by dividing by (100 − moisture) and multiplying by 100.
| Dry food | Wet food | |
|---|---|---|
| Protein as sold | 40% | 10% |
| Moisture | 8% | 78% |
| Dry matter | 92% | 22% |
| Protein on dry matter | 40 ÷ 92 = 43.5% | 10 ÷ 22 = 45.5% |
| Fat as sold | 20% | 6% |
| Fat on dry matter | 21.7% | 27.3% |
On a dry matter basis the wet food is not low in protein; it is a little higher. Only then can the two be compared. The same conversion applies to fat and fibre.
Estimating calories when the label does not say
Many labels, especially in some regions, omit calories. You can estimate using modified Atwater factors: 3.5 kcal per gram for protein, 8.5 for fat and 3.5 for carbohydrate. Carbohydrate is not listed, so find it by difference (nitrogen-free extract, NFE):
NFE = 100 − protein − fat − fibre − moisture − ash
If ash is not listed, use a typical value for the type of food, about 6 to 8% for dry and 2 to 3% for wet, and note that it is an assumption.
Dry food: protein 40, fat 20, fibre 3, moisture 8, ash 8. NFE = 100 − 40 − 20 − 3 − 8 − 8 = 21.
| Part | Percent | × factor | kcal per 100 g |
|---|---|---|---|
| Protein | 40 | 3.5 | 140.0 |
| Fat | 20 | 8.5 | 170.0 |
| NFE | 21 | 3.5 | 73.5 |
| Total | 383.5 |
That is 3,835 kcal per kg, or 3.84 kcal per gram.
Wet food: protein 10, fat 6, fibre 0.5, moisture 78, ash 2. NFE = 100 − 10 − 6 − 0.5 − 78 − 2 = 3.5.
| Part | Percent | × factor | kcal per 100 g |
|---|---|---|---|
| Protein | 10 | 3.5 | 35.0 |
| Fat | 6 | 8.5 | 51.0 |
| NFE | 3.5 | 3.5 | 12.25 |
| Total | 98.25 |
That is 983 kcal per kg, or 0.98 kcal per gram. The Dog Food Calorie Calculator applies the same method to a label’s analysis, and our guide on calculating calories from guaranteed analysis explains the steps in more detail.
Putting it to use: grams per day
A 4 kg inactive cat needs about 198 kcal a day (see indoor cat calorie needs).
| Food | kcal per gram | Grams for 198 kcal |
|---|---|---|
| Example dry | 3.84 | 52 g |
| Example wet | 0.98 | 202 g |
The wet food needs about four times the weight for the same calories, because it is mostly water. This is why the feeding chart on a wet food looks generous. The Cat Food Calculator converts a daily need into grams of wet and dry food.
Cost per 1,000 kcal
Price per kilogram is misleading when foods differ in water. Compare cost per 1,000 kcal.
| Food | Price per kg | kcal per kg | Cost per 1,000 kcal |
|---|---|---|---|
| Example dry | 6.00 | 3,835 | 1.56 |
| Example wet | 8.00 | 983 | 8.14 |
(Example prices.) The wet food costs more per calorie. That is not the end of the comparison, since wet food has other features, but it is a fair view of price. See price per 1,000 kcal and the price per 1,000 kcal calculator.
The ingredient list
Ingredients are listed by weight at the time of mixing. Fresh meat contains a lot of water, so it may sit high in the list although it contributes less once cooked. A meat meal is concentrated. Several similar ingredients listed separately (for example different forms of one grain) can push each down the list. The list helps you spot an allergen or a preference, but it does not show nutrient quality or digestibility. The adequacy statement and the analysis are better guides to nutrition.
What the feeding chart does not tell you
The chart assumes an average cat. It is based on weight, not on whether the cat is neutered, indoors or older.
| Chart says (example, 4 kg) | Calculation says |
|---|---|
| 60 to 70 g dry per day | 52 g for an inactive cat, 63 g for a neutered adult |
If the chart gives more than your cat needs, following it leads to weight gain. Use it as a first guess, then check the scales; see how to weigh a cat at home.
Wet versus dry
Neither is better in every case. Wet food gives more water, is easy to portion by can and is often favoured by cats with certain needs; dry food is cheaper per calorie and convenient. Your vet can advise on special cases. See wet vs dry cat food for a calorie and cost comparison.
A worked label check
You pick up a bag and read: protein 32% min, fat 14% min, fibre 4% max, moisture 10% max, no calories, no ash.
| Step | Working | Result |
|---|---|---|
| Assume ash | Typical dry food | 7% |
| NFE | 100 − 32 − 14 − 4 − 10 − 7 | 33% |
| kcal per 100 g | 32 × 3.5 + 14 × 8.5 + 33 × 3.5 = 112 + 119 + 115.5 | 346.5 |
| kcal per kg | about 3,465 | |
| Dry-matter protein | 32 ÷ 90 | 35.6% |
You now know the food is about 3,465 kcal/kg, an estimate that could be 10% out. If the company will tell you the real figure, use that. Email them and ask; many answer.
From kcal per kg to cans and cups
Labels often give kcal per can or per cup, and the figures come from the same per-gram value. With the example foods:
| Pack | Weight | kcal per gram | kcal in the pack |
|---|---|---|---|
| Wet can | 85 g | 0.983 | 84 |
| Wet can | 156 g | 0.983 | 153 |
| Dry, one cup | 95 g (weighed) | 3.835 | 364 |
A cup is not a unit of weight, and different kibbles fill a cup differently. Weigh a level cup on a kitchen scale once, then use that gram figure for all later sums. If your cat needs 198 kcal a day, one 85 g can supplies 84 kcal, so the rest, 114 kcal, would be 30 g of the dry food (114 ÷ 3.835 = 29.7). The same logic applies to any mixed diet; see wet vs dry cat food.
Common mistakes
- Comparing protein percentages between wet and dry food.
- Taking the feeding chart as the amount.
- Using price per kg to compare foods.
- Treating an estimate as exact.
- Assuming “natural” means complete.
- Ignoring the adequacy statement.
- Forgetting to count treats.
Quick summary
- Read the adequacy statement first, then the analysis and the calories.
- The analysis is as sold; convert to dry matter by dividing by (100 − moisture).
- If kcal is missing, estimate: NFE = 100 − protein − fat − fibre − moisture − ash, then 3.5 × protein + 8.5 × fat + 3.5 × NFE.
- The example dry food is about 3,835 kcal/kg and the wet about 983.
- Compare cost per 1,000 kcal, and use the feeding chart only as a start.
- Use the Dog Food Calorie Calculator.
Frequently asked questions
What is the guaranteed analysis?
Minimum protein and fat and maximum fibre and moisture, as a percentage of the food as sold.
How do I find the calories if they are not on the label?
Estimate with the modified Atwater factors: 3.5 kcal/g for protein and carbohydrate and 8.5 for fat, after working out carbohydrate by difference.
Why can't I compare protein percentages between wet and dry food?
Because wet food is mostly water. Convert to dry matter first by dividing by (100 − moisture).
What is the nutritional adequacy statement?
A line saying whether the food is complete and balanced for a life stage, and how this was shown.
Is the feeding chart reliable?
It is an average. Use it as a starting point and adjust by your cat's weight.
Is a calorie estimate exact?
No. Estimates can be off by 10% or more. The manufacturer's stated figure is better when it is available.
Sources
- AAFCO Pet Food Label Guide and Official Publication (model regulations for pet food)
- WSAVA Global Nutrition Guidelines
- Modified Atwater factors for pet food: 3.5 kcal/g protein, 8.5 kcal/g fat, 3.5 kcal/g carbohydrate (NRC 2006)
Related calculators
- Dog Food Calorie CalculatorWork out how many calories are in a dog or cat food from the nutrient percentages (guaranteed analysis) on its label, when no kcal figure is printed.
- Cat Food CalculatorWork out your cat's daily calories and how to split them between wet and dry food.
- Pet Food Price per 1,000 kcal CalculatorCompare two foods fairly by price per 1,000 calories instead of price per bag.
Keep reading
- How to Read a Dog Food Label: kcal and AnalysisHow to read a dog food label: the adequacy statement, kcal per kg or cup, guaranteed analysis versus dry matter, ingredient order and a step-by-step comparison.
- Calculate Calories in Dog Food From the LabelHow to estimate calories in dog food from the guaranteed analysis using modified Atwater factors: dry and wet worked examples, NFE and the limits.
- Wet vs Dry Cat Food: Calories, Water and CostWet and dry cat food compared on water, calories per gram, grams needed, cost per 1,000 kcal and storage, with a worked example and a mixed-feeding plan.
- When Ash Is Missing on a Pet Food LabelEstimate calories when ash is not listed: use 8% for dry and 2.5% for wet food. A 4-point ash swing moves a dry food about 4% (336 to 350 kcal per 100 g).