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 Indoor 27 is on the lighter side: at 3,760 kcal per kg it has less energy than 79% of the 20 dry cat foods in our list, so the bowl will look fuller for the same calories.
To show how much the food matters: a 4.5 kg spayed or neutered cat needs about 260 kcal a day. That is 69 g of this food, but 61 g of Purina Pro Plan Kitten Healthy Start Chicken and 73 g of Hill's Science Plan Sterilised Adult with Chicken. Same cat, same day, very different scoops.
Royal Canin Indoor 27 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 |
|---|---|---|---|
| 2 kg | 31 g | 38 g | 44 g |
| 3 kg | 42 g | 51 g | 59 g |
| 4 kg | 53 g | 63 g | 74 g |
| 5 kg | 62 g | 75 g | 87 g |
| 6 kg | 71 g | 86 g | 100 g |
| 7 kg | 80 g | 96 g | 112 g |
Label values: 3,760 kcal per kg. Source: zooplus.co.uk, checked 18 Oct 2026.
Questions
How much Royal Canin Indoor 27 should I feed a 5 kg cat?
About 75 g a day for a spayed or neutered cat, before treats. That is 281 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 Indoor 27?
The label states 3,760 kcal per kg (checked 18 Oct 2026). Recipes change, so check your bag.