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
Orijen Senior Grain-Free is one of the more calorie-dense dry dog foods we track: at 427 kcal per cup it has more energy than 85% of the 140 dry dog foods in our list. You will pour less of it than you might expect.
To show how much the food matters: a 40 lb spayed or neutered dog needs about 985 kcal a day. That is 2 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 115 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.
Senior recipes are made for older dogs, who often move less. If yours sleeps most of the day, choose the “Couch dog” setting and check the weight every few weeks.
Orijen Senior Grain-Free 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 | ⅜ cup42 g | ½ cup56 g | ⅝ cup70 g |
| 10 lb 4.5 kg | ⅝ cup70 g | ⅞ cup94 g | 1 cup117 g |
| 15 lb 6.8 kg | ⅞ cup95 g | 1 ⅛ cups127 g | 1 ⅜ cups159 g |
| 20 lb 9.1 kg | 1 cup118 g | 1 ⅜ cups158 g | 1 ¾ cups197 g |
| 30 lb 13.6 kg | 1 ⅜ cups160 g | 1 ⅞ cups214 g | 2 ⅜ cups267 g |
| 40 lb 18.1 kg | 1 ¾ cups199 g | 2 ¼ cups265 g | 2 ⅞ cups332 g |
| 50 lb 22.7 kg | 2 cups235 g | 2 ¾ cups314 g | 3 ⅜ cups392 g |
| 60 lb 27.2 kg | 2 ⅜ cups270 g | 3 ⅛ cups360 g | 3 ⅞ cups450 g |
| 70 lb 31.8 kg | 2 ⅝ cups303 g | 3 ½ cups404 g | 4 ⅜ cups505 g |
| 80 lb 36.3 kg | 2 ⅞ cups335 g | 3 ⅞ cups446 g | 4 ⅞ cups558 g |
| 90 lb 40.8 kg | 3 ⅛ cups366 g | 4 ¼ cups488 g | 5 ¼ cups609 g |
| 100 lb 45.4 kg | 3 ½ cups396 g | 4 ⅝ cups528 g | 5 ¾ cups660 g |
Label values: 427 kcal per cup, 3,710 kcal per kg. Source: 1800petmeds.com, checked 18 Oct 2026.
Questions
How much Orijen Senior Grain-Free should I feed a 50 lb dog?
About 2 ¾ cups or 314 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 Orijen Senior Grain-Free?
The label states 427 kcal per cup, 3,710 kcal per kg (checked 18 Oct 2026). Recipes change, so check your bag.