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 Siamese Adult is on the lighter side: at 344 kcal per cup it has less energy than 78% of the 55 dry 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 ¾ cup of this food, but ⅜ cup of Purina Pro Plan Kitten Complete Essentials Chicken & Rice and ⅞ cup of Kirkland Signature Healthy Weight. Same cat, same day, very different scoops.
A level 8 oz measuring cup holds about 91 g of this kibble. If you have kitchen scales, weighing is more accurate than scooping, because a heaped cup holds noticeably more than a level one.
Royal Canin Siamese Adult 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 | ⅜ cup34 g | ½ cup41 g | ½ cup48 g |
| 6 lb 2.7 kg | ⅜ cup39 g | ½ cup47 g | ⅝ cup55 g |
| 8 lb 3.6 kg | ½ cup49 g | ⅝ cup59 g | ¾ cup68 g |
| 10 lb 4.5 kg | ⅝ cup58 g | ¾ cup69 g | ⅞ cup81 g |
| 12 lb 5.4 kg | ¾ cup66 g | ⅞ cup79 g | 1 cup93 g |
| 14 lb 6.4 kg | ⅞ cup74 g | 1 cup89 g | 1 ⅛ cups104 g |
| 16 lb 7.3 kg | ⅞ cup82 g | 1 ⅛ cups98 g | 1 ¼ cups115 g |
Label values: 344 kcal per cup, 3,775 kcal per kg. Source: royalcanin.com, checked 18 Oct 2026.
Questions
How much Royal Canin Siamese Adult should I feed a 10 lb cat?
About ¾ cup or 69 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 Siamese Adult?
The label states 344 kcal per cup, 3,775 kcal per kg (checked 18 Oct 2026). Recipes change, so check your bag.