PawPortion turns confusing feeding-bag charts into one clear number — based on your pet's real weight, body condition, life stage and activity. Built on the same formulas your veterinarian uses.
Each calculator is tuned to species-specific metabolism. Same friendly interface — just pick the one that wags or purrs.
Every calculation comes with the context you need to feed confidently.
If your pet is over or under condition, we show the healthy weight to aim for — and a safe rate to get there.
Puppies need 2–3× the calories of adults. Seniors need less. Our multipliers shift automatically.
Enter the kcal/cup of your current food and we'll tell you exactly how many cups, grams or cans to serve.
Take a clean one-page summary to your vet visit — or stick it on the fridge as a feeding cheat sheet.
10% treat allotment is baked in by default so your pet still gets the good stuff without busting calorie goals.
Each result links to a relevant explainer so you understand why the number is what it is.
Plain-English answers and product picks to help you feed your pet well.
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PawPortion uses the standard veterinary formula RER = 70 × (body weight in kg)0.75, combined with life-stage and body-condition multipliers from NRC 2006 and WSAVA guidelines. Results are a strong starting point, but individual pets vary by up to 25%. Re-check body condition every 2–4 weeks and adjust portions if needed.
Always enter current weight. The calculator uses body condition score (BCS) to estimate the ideal weight and adjusts calories for maintenance, weight loss or weight gain automatically.
BCS is a 1–9 scale used worldwide to assess body fat. 5/9 is ideal: ribs easily felt with a thin fat cover, visible waist from above and a tucked abdomen from the side. Above 5 indicates overweight; below 5 indicates underweight. Our 60-second BCS guide walks you through it.
No. The calculator runs entirely in your browser. We don't collect, store or sell personal information from calculator users. See our privacy policy for details.