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
Purina ONE 7+ Salmon sits in the middle of the 20 dry cat foods we track, at 3,850 kcal per kg.
To show how much the food matters: a 4.5 kg spayed or neutered cat needs about 260 kcal a day. That is 67 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.
Senior recipes are made for older cats, who often move less. If yours sleeps most of the day, choose the “Lazy indoor” setting and check the weight every few weeks.
Purina ONE 7+ Salmon 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 | 37 g | 43 g |
| 3 kg | 41 g | 50 g | 58 g |
| 4 kg | 51 g | 62 g | 72 g |
| 5 kg | 61 g | 73 g | 85 g |
| 6 kg | 70 g | 84 g | 98 g |
| 7 kg | 78 g | 94 g | 110 g |
Label values: 3,850 kcal per kg. Source: purina.co.uk, checked 18 Oct 2026.
Questions
How much Purina ONE 7+ Salmon should I feed a 5 kg cat?
About 73 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 Purina ONE 7+ Salmon?
The label states 3,850 kcal per kg (checked 18 Oct 2026). Recipes change, so check your bag.