The maths, with your numbers
No guesswork and no brand chart. This is the same calculation a vet does on paper, so you can check it.
What this means for the bowl
Royal Canin Hairball Thin Slices in Gravy is on the lighter side: at 652 kcal per kg it has less energy than 98% of the 42 wet cat foods in our list, so the bowl will look fuller for the same calories.
To show how much the food matters: a 10 lb spayed or neutered cat needs about 261 kcal a day. That is 4 ¾ × can of this food, but 1 ¼ × 5.5 oz can of Instinct Original Grain-Free Pate Real Chicken Recipe Wet Kitten Food and 2 ¾ × 5.1 oz can of Royal Canin Feline Weight Care Thin Slices in Gravy. Same cat, same day, very different bowls.
Wet food is mostly water. Gram for gram, the average dry cat food in our list has about 5.8 times the calories of this one, which is why the wet portion looks so much bigger.
Royal Canin Hairball Thin Slices in Gravy feeding chart
Daily amounts for healthy adult cats with no treats, from the label calories and the AAHA 2021 energy factors. Split the amount into meals.
| Weight | Lazy indoor | Spayed or neutered | Intact |
|---|---|---|---|
| 5 lb 2.3 kg | 2 ¼ × can198 g | 2 ¾ × can238 g | 3 ¼ × can278 g |
| 6 lb 2.7 kg | 2 ¾ × can227 g | 3 ¼ × can273 g | 3 ¾ × can318 g |
| 8 lb 3.6 kg | 3 ¼ × can282 g | 4 × can339 g | 4 ¾ × can395 g |
| 10 lb 4.5 kg | 4 × can334 g | 4 ¾ × can400 g | 5 ½ × can467 g |
| 12 lb 5.4 kg | 4 ½ × can383 g | 5 ½ × can459 g | 6 ¼ × can536 g |
| 14 lb 6.4 kg | 5 × can429 g | 6 × can515 g | 7 ¼ × can601 g |
| 16 lb 7.3 kg | 5 ¾ × can475 g | 6 ¾ × can570 g | 8 × can665 g |
Label values: 652 kcal per kg, 55 kcal per can. Source: royalcanin.com, checked 18 Oct 2026.
Questions
How much Royal Canin Hairball Thin Slices in Gravy should I feed a 10 lb cat?
About 4 ¾ × can or 400 g a day for a spayed or neutered cat, before treats. That is 261 kcal a day divided by the food’s label value. Use the calculator above to adjust for your pet.
How many calories are in Royal Canin Hairball Thin Slices in Gravy?
The label states 652 kcal per kg, 55 kcal per can (checked 18 Oct 2026). Recipes change, so check your bag.