Purina Dog Food Calculator
Same vet formula as every page on this site — with Purina's energy density pre-loaded so you skip the label maths. Edit the kcal field if your specific formula differs. Pro Plan is the performance line and Dog Chow the budget line — the two sit roughly 50 kcal/100 g apart, so the exact formula matters more here than for most brands.
Enter your dog's details
Purina spans wide: Dog Chow runs roughly 345–355 kcal/100 g (label figures 3,469–3,574 kcal/kg across flavours) while Pro Plan adult formulas cluster near 380–410. The default below is 390 (typical Pro Plan); always overwrite with your bag's kcal/kg ÷ 10.
Independent tool: this calculator is not affiliated with or endorsed by Purina; trademarks belong to their owners. The 390 kcal/100 g default is a representative value for Pro Plan adult formulas, taken from published label figures — formulas vary inside a brand, so enter your bag’s kcal/kg ÷ 10 for the exact number.
Purina portions by weight
| Dog weight | RER (resting) | Daily target | Food per day | Per meal (×2) |
|---|---|---|---|---|
| 3 kg · 7 lb | 160 kcal | 255 kcal | 59 g | 29 g |
| 5 kg · 11 lb | 234 kcal | 374 kcal | 86 g | 43 g |
| 8 kg · 18 lb | 333 kcal | 533 kcal | 123 g | 61 g |
| 10 kg · 22 lb | 394 kcal | 630 kcal | 145 g | 73 g |
| 15 kg · 33 lb | 534 kcal | 854 kcal | 197 g | 98 g |
| 20 kg · 44 lb | 662 kcal | 1,059 kcal | 244 g | 122 g |
| 25 kg · 55 lb | 783 kcal | 1,252 kcal | 289 g | 144 g |
| 30 kg · 66 lb | 897 kcal | 1,436 kcal | 331 g | 166 g |
| 35 kg · 77 lb | 1,007 kcal | 1,612 kcal | 372 g | 186 g |
| 40 kg · 88 lb | 1,113 kcal | 1,781 kcal | 411 g | 206 g |
| 50 kg · 110 lb | 1,316 kcal | 2,106 kcal | 486 g | 243 g |
| 60 kg · 132 lb | 1,509 kcal | 2,415 kcal | 557 g | 279 g |
Neutered adult on Purina at 390 kcal/100 g, 10% treat allowance removed, 2 meals.
How to use this calculator
Enter weight
Enter the dog's weight (use ideal weight for weight loss).
Select life stage and goal
Select the life stage and goal so the correct MER factor applies.
Enter food energy density
Enter the food's energy density (kcal per 100 g) from its label.
Read the daily portion
Read the daily portion in grams, split it across meals, and adjust by 10% every 2 weeks based on body condition.
Frequently asked
How much Purina Pro Plan for a 20 kg dog?
At 390 kcal/100 g, a neutered 20 kg dog eats ~244 g/day (1,059 kcal target, treats removed) — the Pro Plan bag chart typically suggests more, because charts assume an intact, active dog.
How many calories in Purina Dog Chow?
Around 350 kcal/100 g (about 3,500 kcal/kg; label figures run 3,469–3,574 across flavours) for standard adult Dog Chow — notably lighter than Pro Plan, so portions run roughly 10–15% larger by weight.
How many cups of Purina is that per day?
About 2.4 cups at a typical 100 g cup — but cups vary by up to 40% between kibbles and scoops, which is why this page works in grams (244 g/day for a 20 kg neutered dog). Weigh once, and the cup question disappears.
Why does the Purina bag chart suggest a different amount?
Bag charts are printed for the average dog of each size and tend to run generous. This calculator uses your dog's actual weight and life stage against Purina's representative energy (390 kcal/100 g) — if your exact formula's label differs, enter its kcal/kg ÷ 10 and the portion rescales instantly.
Related calculators
Dog Calorie Calculator
RER & MER explained and calculated — resting vs daily energy, per life stage.
Dog Food Cost Calculator
Cost per day and month, and how long a bag really lasts.
Dog Food Calculator by Weight
Portions for every weight, 1 kg to 90 kg — table first, calculator second.
Popular breeds on this food
Daily portions for the breeds owners ask about most — same formula, each breed's mid-range weight: