Eggs deliver the most protein per dollar in the dairy case: 34.4 grams, based on USDA data and a $2.19 July-2026-audited dozen. Among the actual dairy, part-skim mozzarella leads at 30.1 grams per dollar, and plain whole milk at 29.1 quietly beats Greek yogurt at 27.5. The gallon jug outscores the tub everyone buys for the protein.
This is the eggs-and-dairy slice of our full protein per dollar study, which ranked the whole grocery store. Six fridge staples, one division problem each, and a couple of results that made me double-check the spreadsheet.
What’s the cheapest dairy protein per dollar?
| Rank | Food | Protein per $1 | Price | Package |
|---|---|---|---|---|
| 1 | Eggs (large) | 34.4 g | $2.19 | 1 dozen |
| 2 | Mozzarella (low-moisture part-skim) | 30.1 g | $3.58 | 16 oz block |
| 3 | Whole milk | 29.1 g | $4.22 | 1 gallon |
| 4 | Greek yogurt (plain, nonfat) | 27.5 g | $3.36 | 32 oz tub |
| 5 | Cottage cheese (4%) | 26.3 g | $2.87 | 24 oz tub |
| 6 | Cheddar cheese | 18.2 g | $5.69 | per lb |
Source: USDA FoodData Central + single-store prices, July 2026. Full methodology at /methodology/.
Yes, eggs technically aren’t dairy. They live in the same aisle, they’re in the same category in our dataset, and leaving out the winner felt like rigging the contest. So they stay.
Does whole milk really beat Greek yogurt for protein value?
By our math, yes: 29.1 grams of protein per dollar for the $4.22 gallon versus 27.5 for the $3.36 Greek yogurt tub. It’s a small gap, but think about what’s being compared. One of these products has spent the last decade on billboards flexing about protein. The other one is just milk.
Multiply it out and a single gallon carries roughly 123 grams of protein for $4.22. Nobody instagrams a glass of whole milk, but the numbers don’t care. Greek yogurt still earns its spot for texture, tang, and the fact that you can eat it with a spoon at your desk. Just don’t buy it believing it’s the frugal protein play, because the gallon behind it on your fridge shelf is doing slightly better.
Cottage cheese at 26.3 grams per dollar rounds out the cultured-tub trio, close enough that you should buy whichever one you’ll actually finish. If you’re torn, we’ve compared cottage cheese vs Greek yogurt head to head. All three tubs also count as protein you can eat without turning on the stove, which is worth real money on the nights cooking isn’t happening.
Why do eggs win the whole category?
Because a dozen costs $2.19 and gives you about 600 grams of edible food. That works out to 34.4 grams of protein per dollar, ahead of every meat cut in our broader study except bone-in chicken drumsticks. Widen it to the whole grocery store, though, and eggs drop to 19th out of 49 foods, because every dried legume beats them. Eggs are also the only item on this list that works at every meal without effort: a stacked egg sandwich at lunch, savory oatmeal bowls with eggs and avocado in the morning, or cauliflower fried rice with eggs when dinner needs rescuing. At breakfast specifically they trail oats once fiber counts too, which is how the cheapest breakfast staples shake out.
One dollar of eggs gets you about two-thirds of the FDA’s 50-gram Daily Value for protein. That’s a strong return for something that comes in its own portion-controlled packaging.
Is cheese a bad protein buy?
Depends entirely on the block. Mozzarella at 30.1 grams per dollar is the second-best item in the case, which is excellent news for anyone whose cauliflower pizza crust needs a topping. Cheddar at 18.2 grams per dollar is the worst item in the case, because $5.69 a pound buys a lot of sharpness and not much value.
Here’s the useful part, though: even last-place cheddar isn’t a disaster. The whole category sits inside a 1.9x spread from eggs to cheddar. Compare that with the full grocery study, where the gap between the best and worst foods is enormous. Dairy is a tight race. You can shop this aisle on taste and barely lose anything on protein math.
If you want the numbers on everything else that came from an animal, the 21-food animal protein ranking puts this aisle up against meat and fish, what 50 grams of protein costs per day turns it into a daily budget, and the high-protein on a budget guide puts the whole strategy together. Meanwhile: buy the eggs, buy the gallon, and let the yogurt aisle keep its billboards.
