Walmart vs Kroger vs Costco: Where Are Groceries Actually Cheapest? (2026 Data)

Everyone has an opinion on which grocery store is cheapest. Walmart fans swear by everyday low prices. Kroger loyalists love the weekly sales. Costco members point to bulk savings. But who actually wins?

We compared real prices on 20 common grocery items across five major chains. Here's what we found.

The 20-Item Basket Test

We priced a standard weekly basket: milk, eggs, bread, chicken breast, ground beef, bananas, apples, rice, pasta, canned tomatoes, cheese, butter, cereal, orange juice, potatoes, onions, frozen vegetables, yogurt, coffee, and cooking oil.

Results: Total Basket Cost

Store	Basket Total	vs. Average
Walmart	$67.42	-8%
Costco	$62.18*	-15%
Kroger	$71.89	-2%
Target	$74.53	+2%
Safeway	$78.21	+7%

*Costco prices are per-unit equivalent; requires membership ($65/year). Bulk sizes not always practical for small households.

Key Findings

Walmart Wins on Everyday Staples

Walmart's "Everyday Low Price" delivers on basics: milk, bread, eggs, rice, and canned goods were consistently cheapest. Great Value brand items averaged 27% less than name brands at other stores.

Kroger Wins on Weekly Sales

Kroger's regular prices are higher than Walmart, but their weekly digital coupons can beat everyone. During sale weeks, chicken breast dropped to $1.49/lb (vs. Walmart's $2.18/lb). The catch: you have to catch the sale.

Costco Wins on Bulk Non-Perishables

For coffee, cooking oil, rice, and cleaning supplies, Costco's per-unit cost is unbeatable. But buying 5 lbs of strawberries only saves money if you eat them all before they go bad.

Target Wins on... Nothing (Usually)

Target's grocery prices are generally 5-10% higher. The exception: Target Circle deals on specific items can match or beat competitors. Good for convenience, not for budget shopping.

Safeway Is Expensive Unless You Play the Game

Safeway's shelf prices are the highest in our test. But their "Just for U" personalized deals can drop prices significantly. Power users who stack digital coupons can do well — but it takes effort.

The Smart Strategy: Shop Multiple Stores

No single store wins every category. The optimal strategy is:

Walmart for weekly staples and pantry items
Kroger for sale items (check weekly ad)
Costco for monthly bulk non-perishables

But who has time to check three stores' prices every week? That's exactly what iofill does — it scans deals from all your preferred stores and tells you where each item is cheapest. Try it free.