Pet Food on Unit Price Without Cutting Nutrition: How to Compare Cost per Day in Canada

A heavier bag with a friendlier price can be the expensive food once you divide by the calories the animal is actually fed. This page is that division. It is not a ranking of brands, and it is not a feeding plan. No Canadian shelf price loaded on 26 Sep 2026, so the worksheet is a template plus one labelled illustration. Nutrition stays with your veterinarian, especially if the animal is on a diet the clinic prescribed. The dollar lines for food on the 2025 Ontario cost sheets, $866 and $1,418 for dogs and $674 and $773 for cats, are category averages. They are not the price of a bag in your cart. Repricing those averages is the dog budget and the cat budget after you have a cost per day.

Why price per bag lies: calculate cost per day from kcal and feeding guides

Two bags can cost the same and feed a different number of days. The missing pieces are the weight, the calorie density, and how much you put in the bowl. Write the price as Canadian dollars. Write the net weight in kilograms. If the bag is labelled in pounds, convert with the factor printed on the package or with 0.4536 kilograms per pound, and say which you used. Find kilocalories per kilogram. If the bag only prints kilocalories per cup, you still need the cup weight or you are mixing a volume price with a weight price. The feeding guide on the bag is the manufacturer’s suggested daily amount for a weight and a life stage. It is a guide. AAFCO’s own page says individual animals differ in activity, genetics, and environment, and that directions may need to change. Your veterinarian’s amount, if you have one, replaces the guide. Do not invent a “normal” intake for your dog and call it the label.

The formula is cost per day = (price ÷ (kilograms × kilocalories per kilogram)) × daily kilocalories. The piece in the brackets is the price of one kilocalorie. Multiply by the kilocalories you feed. A bag that is cheaper per kilogram and much less calorie-dense can cost more per day. A bag that is dear per kilogram and very dense can cost less if you feed fewer grams. That is the whole method. The grocery unit-price guide is the same instinct in another aisle, per kilogram or per litre. Pet food adds the calorie step because a kilogram of one diet is not a kilogram of another. Price-matching a bag without the calorie line is how the bag price wins an argument it should lose. The household price-match guide is for products where the unit is already the same. Use it only after cost per day matches.

Reading labels: AAFCO statements, guaranteed analysis and calories

The Association of American Feed Control Officials’ “Reading Labels” page, opened 26 Sep 2026, is a U.S. model-regulation explanation. The page says the models are not themselves official regulations, that most states adopt a version, and that the U.S. Food and Drug Administration’s animal-food rules apply to products that cross state lines. This draft did not open a Canadian Food Inspection Agency pet-food labelling regulation, so do not read the next sentences as “Canada requires this wording.” Read them as what that AAFCO page says a label is built to show, which is also what you can look for on a bag sold here. If the Canadian bag prints the same lines, use the numbers. If it does not, you cannot complete the formula.

The nutritional adequacy statement, the page says, is usually in small print on the back or side. It is how the product claims to match a life stage. The page says the model regulations recognize the AAFCO dog food nutrient profiles, the cat food nutrient profiles, and the dog and cat feeding protocols as the basis for those claims. A statement that the food is complete for adult maintenance is not a statement that it is complete for growth or pregnancy. Snacks, treats, and supplements are often exempt from the adequacy statement. A product that says it is for intermittent or supplemental feeding only is, on that page, not claiming to be the whole diet. The guaranteed analysis is usually near the ingredient list and, the page says, includes four basics: a minimum percentage of crude protein, a minimum percentage of crude fat, a maximum percentage of crude fibre, and a maximum percentage of moisture. “Crude” refers to the lab method. It is not a review of ingredient quality. Ingredients are listed by weight, heaviest first, and the list does not give the grams of each one.

Calories, the page says, appear under a heading “Calorie Content,” in kilocalories per kilogram of food as fed and per familiar unit such as a can, a cup, or a biscuit. A “light,” “lite,” or “low-calorie” claim has to be a real reduction against a standard product, with feeding directions that match, and the page’s example is that a lite dry dog food cannot contain more than 3,100 kilocalories per kilogram. That ceiling is a claim rule on the AAFCO page, not a recommended intake. Feeding directions for a complete food, the page says, must say at least how much weight of food to give per weight of animal per unit of time. All-life-stage products should give different directions for gestation and lactation, growth, and maintenance. Veterinary medical foods may skip feeding directions if the label says to use them only as directed by your veterinarian. That sentence is the bridge to the next section.

Vet guidance: when prescription or specific diets matter

Unit price compares foods that can do the same job. A diet a veterinarian has prescribed for a disease, a stone, a novel protein, or a calorie target is not the same job as the maintenance bag beside it. AAFCO’s page says therapeutic diets still need a nutritional adequacy statement, and that some are labelled intermittent or supplemental because they limit nutrients below what a healthy animal needs. Swapping one of those for a cheaper complete food because the cost per day looks better can be the opposite of the prescription. Ask the clinic before you change it. This page will not name a condition or a brand that “must” stay. If the label says to use the food only as the veterinarian directs, the unit-price worksheet is how you budget the food you were told to buy, not how you pick a different one.

A healthy adult animal with no prescribed diet is the case where cost per day is the right first sort. Even then, the life stage on the adequacy statement has to match the animal. A growth formula and a maintenance formula are not substitutes because one bag is on sale. If you are unsure which statement fits, that question goes to the veterinarian, not to the cheapest row in the worksheet. The insurance and dental conversations on the other pet guides are separate bills. Food is not a treatment plan.

Store brands vs premium brands at Canadian retailers

No banner’s pet-food price was opened for this draft. There is no winner between a store brand and a premium label, and there will not be a ranked list. The comparison, when you are in the aisle, is life stage, calorie density, and cost per day, then whether you will feed the amount the math assumes. A store brand that matches the statement you need and costs less per day is the cheaper adequate food on that trip. A premium bag that costs less per day because it is dense is also a real result. A premium bag that costs more per day is a preference or a prescription, and you should know which. The store-brand household guide is about paper and soap, where a factory name was also not the point. Do not copy a paper-towel result into a cat food.

Warehouse clubs and discount grocers change the bag size more than they change the formula. The Costco household aisle and the Costco and No Frills split are about whether a large pack gets used. The same test applies to a large pet-food bag: the low price per kilogram is only cheap if the last kilogram is fed while the food is still in the condition the bag’s storage line describes. Amazon.ca is an offer type in the disclosure, not a ranked retailer. If you buy there, run the same formula on the calories in the listing, then confirm them on the bag when it arrives. A listing that omits kilocalories per kilogram cannot be compared yet.

Bag size, storage and waste

A larger bag spreads the price over more kilograms. It does not pause time. The best-before date and the storage sentence on that bag are the limits. This draft did not open a study of how many days an opened bag stays sound, so no “use within six weeks” rule is printed here. If you will not finish the bag by the date and under the storage conditions it prints, price the smaller bag instead. Waste is the other leak. Feeding more than the guide, without a reason you and the veterinarian have, raises cost per day in a straight line. A bowl you fill to the same mark after you switch to a denser food is a quiet increase. Weigh the scoop for a week. Write the grams. Put those grams, not the picture on the bag, into the daily-calorie step.

An opened bag that spoils is a total loss of the remaining kilograms, which makes the apparent cost per day a fiction. Split a very large bag with another household only if you both need the same food and you trust the storage. Otherwise the smaller bag that you finish is the unit-price winner even when the sticker per kilogram is higher. Track the price the way you track any other repeat purchase, with the price-tracking habit if the seller is online, and ignore a sale that does not survive the formula.

A cost-per-day worksheet for a 10 kg, 25 kg and 40 kg dog and an adult cat

Copy the blank rows onto paper in the store. The worked row is not a product. It uses an illustrative price of $5.00 a kilogram, an illustrative 3,500 kilocalories per kilogram, and illustrative daily intakes of 500, 1,000, 1,500, and 250 kilocalories. Those intakes are round numbers so the arithmetic is visible. They are not feeding guides. At $5.00 a kilogram and 3,500 kilocalories per kilogram, one kilocalorie costs $5 ÷ 3,500, which is about 0.143 cents. Times 500 is $0.71 a day. Times 1,000 is $1.43. Times 1,500 is $2.14. Times 250 is $0.36. Doubling the price to an illustrative $10.00 a kilogram doubles each of those days. A real bag will not be these numbers. That is the point of the blank cells.