# PetPortions.com > Free pet food portion and cost calculator built by a veterinarian. Helps dog and cat owners calculate exact daily feeding amounts, compare food prices across retailers, and find the best value pet food. ## About PetPortions.com is a vet-developed platform that takes the guesswork out of feeding pets. It uses the standard veterinary Resting Energy Requirement (RER) formula — 70 × (body weight in kg)^0.75 — multiplied by life-stage activity factors to calculate precise daily calorie needs and portion sizes. The platform covers 25+ pet food brands across multiple retailers in the US, UK, and Canada. All calculations are based on each food's actual calorie density (kcal/cup or kcal/100g) to give accurate cost-per-day comparisons rather than misleading cost-per-bag figures. ## Core Tools - **Pet Food Calculator** (https://petportions.com/): Enter your pet's weight, age, and activity level to get exact daily portions in cups/grams for any supported food. - **Compare Foods** (https://petportions.com/): Side-by-side comparison of up to 3 foods showing cost per day, cost per month, and nutritional differences. - **Analyse My Food** (https://petportions.com/): Enter any food's calorie info and price to calculate your current feeding cost. - **Toxic Food Checker** (https://petportions.com/toxic-foods): Searchable database of 38 foods, plants, and household items toxic to dogs and cats. Includes severity ratings, symptoms, and images for each item. - **Treat Calculator** (https://petportions.com/): Calculate safe treat amounts using the veterinary 10% treat rule. Shows how many of each treat type your pet can safely have per day. - **Transition Planner** (https://petportions.com/): 7-day plan to safely switch between pet foods, with daily ratios of old-to-new food to prevent digestive upset. - **Happy Tummies Probiotic Guide** (https://petportions.com/happy-tummies): Vet-recommended probiotics for dogs and cats. Covers when to use probiotics, key bacterial strains, and product comparisons with prices. ## Pages - https://petportions.com/toxic-foods — Toxic Foods & Plants for Dogs and Cats: Comprehensive searchable guide to 38 foods, plants, and household items dangerous to pets with severity ratings, symptoms, and emergency vet finder. - https://petportions.com/happy-tummies — Happy Tummies Probiotic Guide: Vet-recommended probiotics for dogs and cats, including strain information, use cases, and product comparisons across retailers. - https://petportions.com/about — About PetPortions: Built on real-world veterinary experience to help pet owners calculate accurate feeding portions and compare pet food prices. - https://petportions.com/contact — Contact Us: Get in touch with the PetPortions team for questions about the calculator, data, or partnerships. - https://petportions.com/blog — Pet Food Blog: Expert articles on pet food costs, feeding portions, and brand comparisons written by a veterinarian. ## Breed-Specific Calculators Dedicated food calculators for 20 popular dog breeds with breed-specific nutritional guidance: - https://petportions.com/dog-food-calculator/labrador — Labrador Retriever - https://petportions.com/dog-food-calculator/german-shepherd — German Shepherd - https://petportions.com/dog-food-calculator/golden-retriever — Golden Retriever - https://petportions.com/dog-food-calculator/poodle — Poodle - https://petportions.com/dog-food-calculator/french-bulldog — French Bulldog - https://petportions.com/dog-food-calculator/dachshund — Dachshund - https://petportions.com/dog-food-calculator/beagle — Beagle - https://petportions.com/dog-food-calculator/rottweiler — Rottweiler - https://petportions.com/dog-food-calculator/husky — Siberian Husky - https://petportions.com/dog-food-calculator/border-collie — Border Collie - https://petportions.com/dog-food-calculator/chihuahua — Chihuahua - https://petportions.com/dog-food-calculator/bulldog — Bulldog - https://petportions.com/dog-food-calculator/boxer — Boxer - https://petportions.com/dog-food-calculator/shih-tzu — Shih Tzu - https://petportions.com/dog-food-calculator/yorkshire-terrier — Yorkshire Terrier - https://petportions.com/dog-food-calculator/doberman — Doberman - https://petportions.com/dog-food-calculator/great-dane — Great Dane - https://petportions.com/dog-food-calculator/cocker-spaniel — Cocker Spaniel - https://petportions.com/dog-food-calculator/maltese — Maltese - https://petportions.com/dog-food-calculator/jack-russell — Jack Russell Terrier ## Brand Comparisons - https://petportions.com/compare/royal-canin-vs-hills-science-diet — Royal Canin vs Hill's Science Diet - https://petportions.com/compare/royal-canin-vs-purina-pro-plan — Royal Canin vs Purina Pro Plan - https://petportions.com/compare/hills-science-diet-vs-purina-pro-plan — Hill's Science Diet vs Purina Pro Plan - https://petportions.com/compare/blue-buffalo-vs-royal-canin — Blue Buffalo vs Royal Canin - https://petportions.com/compare/orijen-vs-acana — Orijen vs Acana - https://petportions.com/compare/hills-vs-blue-buffalo — Hill's vs Blue Buffalo - https://petportions.com/compare/purina-vs-blue-buffalo — Purina vs Blue Buffalo - https://petportions.com/compare/royal-canin-vs-eukanuba — Royal Canin vs Eukanuba - https://petportions.com/compare/hills-vs-eukanuba — Hill's vs Eukanuba - https://petportions.com/compare/purina-vs-orijen — Purina vs Orijen ## Blog - https://petportions.com/blog/best-dog-food-for-budget — Best Dog Food for Budget-Conscious Owners - https://petportions.com/blog/cost-of-feeding-dog-per-month — How Much Does It Cost to Feed a Dog Per Month? - https://petportions.com/blog/how-much-should-i-feed-my-dog — How Much Should I Feed My Dog? A Vet's Guide - https://petportions.com/blog/how-to-compare-dog-food-prices — How to Compare Dog Food Prices Fairly - https://petportions.com/blog/best-dog-food-for-labradors — Best Dog Food for Labradors in 2026 - https://petportions.com/blog/how-much-to-feed-a-dog-by-weight — How Much to Feed a Dog by Weight — Vet Feeding Chart - https://petportions.com/blog/royal-canin-vs-hills-science-diet-review — Royal Canin vs Hill's Science Diet — Full Comparison - https://petportions.com/blog/best-dog-food-for-sensitive-stomachs — Best Dog Food for Sensitive Stomachs in 2026 - https://petportions.com/blog/how-much-does-dog-food-cost-per-month — How Much Does Dog Food Cost Per Month in 2026? ## Key Information - **Pricing**: Completely free, no account required - **Data sources**: Product data from Chewy, Amazon, PetSmart, Petco, and other major retailers - **Calorie formula**: RER = 70 × (body weight in kg)^0.75, multiplied by activity factor (1.0–5.0) - **Activity factors**: Neutered adult 1.6, Intact adult 1.8, Senior/light 1.2–1.4, Active/working 2.0–5.0, Puppy 2.0, Weight loss 1.0 - **Cat factors**: Sterilised 1.2, Intact 1.4, Kitten 2.5 - **10% treat rule**: Treats should not exceed 10% of daily calorie intake - **Website**: https://petportions.com - **Built by**: A veterinarian with real-world clinical experience