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
Rachael Ray Nutrish Grain Free Tuna Purrfection sits in the middle of the 42 wet cat foods we track, at 861 kcal per kg.
To show how much the food matters: a 10 lb spayed or neutered cat needs about 261 kcal a day. That is 3 ¾ × 2.8 oz cup 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 4.4 times the calories of this one, which is why the wet portion looks so much bigger.
Rachael Ray Nutrish Grain Free Tuna Purrfection 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 | 1 ¾ × 2.8 oz cup150 g | 2 ¼ × 2.8 oz cup180 g | 2 ½ × 2.8 oz cup210 g |
| 6 lb 2.7 kg | 2 ¼ × 2.8 oz cup172 g | 2 ½ × 2.8 oz cup207 g | 3 × 2.8 oz cup241 g |
| 8 lb 3.6 kg | 2 ¾ × 2.8 oz cup214 g | 3 ¼ × 2.8 oz cup257 g | 3 ¾ × 2.8 oz cup299 g |
| 10 lb 4.5 kg | 3 ¼ × 2.8 oz cup253 g | 3 ¾ × 2.8 oz cup303 g | 4 ½ × 2.8 oz cup354 g |
| 12 lb 5.4 kg | 3 ½ × 2.8 oz cup290 g | 4 ¼ × 2.8 oz cup348 g | 5 × 2.8 oz cup406 g |
| 14 lb 6.4 kg | 4 × 2.8 oz cup325 g | 4 ¾ × 2.8 oz cup390 g | 5 ¾ × 2.8 oz cup455 g |
| 16 lb 7.3 kg | 4 ½ × 2.8 oz cup359 g | 5 ½ × 2.8 oz cup431 g | 6 ¼ × 2.8 oz cup503 g |
Label values: 861 kcal per kg, 69 kcal per 2.8 oz cup. Source: nutrish.com, checked 18 Oct 2026.
Questions
How much Rachael Ray Nutrish Grain Free Tuna Purrfection should I feed a 10 lb cat?
About 3 ¾ × 2.8 oz cup or 303 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 Rachael Ray Nutrish Grain Free Tuna Purrfection?
The label states 861 kcal per kg, 69 kcal per 2.8 oz cup (checked 18 Oct 2026). Recipes change, so check your bag.