Treat Price per Ounce: How to Compare
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Divide the price by the ounces in the bag and you have price per ounce, the one number that lets two bags of different sizes be compared fairly.
Price per ounce in one step
Take the price on the bag's page and divide it by the net weight printed on the label. Net weight is the weight of what is inside, in ounces and grams, on the front panel. Use that figure, not the size of the bag, which tells you nothing.
The house freeze dried beef heart comes in 1.5, 3 and 6 ounce bags, so it makes a tidy example. Divide each bag's price by 1.5, 3 or 6 in turn. The three answers sit side by side as price per ounce, and the lowest is the cheapest ounce of heart, whatever the bag looks like on the shelf.
Sniff and Shift freeze dries beef heart in small batches in Malvern from Pennsylvania farm beef, a single ingredient treat, and the printed label on the 3 ounce bag gives its net weight as 85 grams. That is the line you divide by.
If a listing gives only grams, divide the same way to get price per gram, then multiply by 28 to land back at price per ounce, since an ounce is about 28 grams.
The bag size stops mattering once you have the figure: a 1.5 ounce bag and a 6 ounce bag differ only in how many times the same division fits into them, and the ranking comes out the same in grams.
Write the result next to the bag's price in your phone's notes, one line per bag: name, net weight, price, price per ounce. Next month, when a bag you did not know appears, the line tells you in a few seconds whether it is in the same range.
Why freeze dried looks expensive
A freeze dried bag looks costly beside a biscuit because you are buying very little water. A baked biscuit holds flour and moisture and weighs more for its size, so an ounce of it holds less of the main ingredient. An ounce of freeze dried heart is nearly all heart.
The comparison tells you what an ounce contains, not which is better value. A fair comparison needs the same base: the same ounces of the same kind of thing. Use per ounce within a form, and move to the next step when you cross forms.
Water weight: comparing dry treats to fresh food
USDA FoodData Central lists raw beef heart at about 77 grams of water in every 100 grams. By the same USDA entry that leaves about 23 grams of dry matter, so an ounce of freeze dried heart stands in for at most about four and a third ounces of fresh, since one divided by 0.23 is about 4.3, and a dry treat keeps a little water of its own.
So take the dry heart's price per ounce and divide it by about four. The answer is roughly what you pay for each ounce of fresh heart it replaces, and set against a butcher's price per ounce it gives you a like for like number.
The trade off is that fresh heart has to be cooked, cut and kept cold, and the dry version needs none of that. The guide to single ingredient dog treats shows other examples where the label is a single line.
Pieces per bag
Some treats are sold by count, and some by weight, and the two do not convert on their own. If ten pieces weigh a known amount on your kitchen scale, divide the net weight by that figure to count the pieces in a bag. As an invented example, an 85 gram bag of pieces that weigh 1.7 grams each holds about 50 of them.
Price per piece is what you pay for each reward. When two treats are sized differently, it matters more than price per ounce, since a dog gets a reward and not an ounce. Weigh ten pieces from each and compare the cost of one.
When the bigger bag is not the better buy
If the largest bag works out cheapest per ounce, it is also the bag that stays open the longest. A treat that goes stale before it is used costs more per piece eaten than a small bag finished on time.
The check is easy: divide the bag's net weight by the grams you give in a day, and the result is the number of days it lasts. If that number is longer than a few weeks, price the small bag instead, and read how to store pet treats for keeping a large bag fresh.
The same arithmetic works for any shelf, including baked dog treats and the forms compared in freeze dried, air dried, dehydrated and baked treats.
Common questions
Is a bigger bag always cheaper per ounce?
Often, but not always, so divide to check. Bags can differ in price in ways that do not follow size. The division takes ten seconds and settles it.
Should I compare price per ounce or price per piece?
Use price per ounce for treats cut the same way, and price per piece for treats sold by count, such as feet or ears. Weigh ten pieces on a kitchen scale to move between the two.
Where do I find a treat's net weight?
On the front panel of the bag, usually in ounces and grams near the bottom. Use that figure, not the size of the bag. On this site the product page also lists the size.
Does price per ounce include shipping?
No. It compares the bags themselves, so keep shipping out of it. Shipping is shown at checkout and varies with the basket.