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
Hill's Science Diet Adult Perfect Weight Chicken & Brown Rice Recipe is on the lighter side: at 298 kcal per cup it has less energy than 97% of the 140 dry dog foods in our list, so the bowl will look fuller for the same calories.
To show how much the food matters: a 40 lb spayed or neutered dog needs about 985 kcal a day. That is 3 ¼ cups of this food, but 1 ⅞ cups of Purina Pro Plan All Ages Sport Performance 30/20 Salmon & Rice and 3 ⅝ cups of Kirkland Signature Healthy Weight Chicken and Vegetable. Same dog, same day, very different scoops.
A level 8 oz measuring cup holds about 93 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.
This is a weight-control recipe. If your dog needs to slim down, tick “Needs to lose weight” in the calculator and enter the target weight your vet gave you; the portion is then worked out for the target, not the current weight.
Hill's Science Diet Adult Perfect Weight Chicken & Brown Rice Recipe feeding chart
Daily amounts for healthy adult dogs with no treats, from the label calories and the AAHA 2021 energy factors. Split the amount into meals.
| Weight | Couch dog | Spayed or neutered | Very active |
|---|---|---|---|
| 5 lb 2.3 kg | ½ cup49 g | ¾ cup65 g | ⅞ cup81 g |
| 10 lb 4.5 kg | ⅞ cup82 g | 1 ⅛ cups109 g | 1 ½ cups136 g |
| 15 lb 6.8 kg | 1 ⅛ cups111 g | 1 ⅝ cups148 g | 2 cups185 g |
| 20 lb 9.1 kg | 1 ½ cups138 g | 2 cups184 g | 2 ½ cups229 g |
| 30 lb 13.6 kg | 2 cups187 g | 2 ⅝ cups249 g | 3 ⅜ cups311 g |
| 40 lb 18.1 kg | 2 ½ cups232 g | 3 ¼ cups309 g | 4 ⅛ cups386 g |
| 50 lb 22.7 kg | 2 ⅞ cups274 g | 3 ⅞ cups365 g | 4 ⅞ cups456 g |
| 60 lb 27.2 kg | 3 ⅜ cups314 g | 4 ½ cups418 g | 5 ⅝ cups523 g |
| 70 lb 31.8 kg | 3 ¾ cups352 g | 5 cups470 g | 6 ¼ cups587 g |
| 80 lb 36.3 kg | 4 ⅛ cups389 g | 5 ½ cups519 g | 7 cups649 g |
| 90 lb 40.8 kg | 4 ½ cups425 g | 6 ⅛ cups567 g | 7 ⅝ cups709 g |
| 100 lb 45.4 kg | 4 ⅞ cups460 g | 6 ⅝ cups614 g | 8 ¼ cups767 g |
Label values: 298 kcal per cup, 3,189 kcal per kg. Source: hillspet.com, checked 18 Oct 2026.
Questions
How much Hill's Science Diet Adult Perfect Weight Chicken & Brown Rice Recipe should I feed a 50 lb dog?
About 3 ⅞ cups or 365 g a day for a spayed or neutered dog, before treats. That is 1,164 kcal a day divided by the food’s label value. Use the calculator above to adjust for your pet.
How many calories are in Hill's Science Diet Adult Perfect Weight Chicken & Brown Rice Recipe?
The label states 298 kcal per cup, 3,189 kcal per kg (checked 18 Oct 2026). Recipes change, so check your bag.
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