Compare Pet Food by Cost per Day, Not Bag Price

Start with the portion your pet would actually eat from each food. A smaller bag can last longer than a larger one if the daily portion is smaller. Likewise, the lowest price per ounce doesn’t always mean the lowest cost per day. Compare only foods that suit your pet’s species, life stage, and veterinary feeding plan.

Use three numbers, in matching units

Write down the net weight, the expected daily portion for that specific food, and what you would pay for the package. AAFCO’s label guide explains where net quantity and feeding directions fit on the label. If you weigh food in grams, convert the package weight to grams too. A scoop or cup isn’t a unit of weight. For a real label example, the PARTNER Chicken Recipe cat food page lists an 8 oz net weight; that number is the food in the bag, not the amount to serve in a day. Our guide to weighing freeze-dried food explains how to get a repeatable portion.

Package weight ÷ grams fed per day = days per package. Package cost ÷ days per package = daily food cost. Include delivery fees if they would apply to the purchase you’re comparing.

These are imaginary packages, not equivalent diets or feeding recommendations. The different portions reflect what you would put into the calculation after confirming a suitable amount for each food. If both foods are suitable but you haven’t established the portions, use the calorie information and your veterinary team’s feeding advice before drawing a price conclusion. The WSAVA food selection guide explains why calorie density and adequacy are separate questions.

Check where your estimate could be wrong

Count food you regularly throw away. If a pack contains ten servings on paper but your household reliably uses eight before discarding the rest, eight is the realistic denominator for that pack. For a mixed menu, add the daily cost of each food your pet eats rather than averaging the two package prices. Save the portion and date with the result so you know when to recalculate.

Written by PARTNER Editorial Team for general education. Contact your veterinary team for advice about your pet’s individual health and feeding needs.