Woolworths vs Coles vs ALDI vs Costco: Where Australians Save the Most on a Weekly Shop

Four big names, one weekly shop, and a surprising amount of money riding on how you divide it between them. No single store wins every aisle — ALDI owns staples, Costco owns bulk, and Woolworths and Coles trade blows on brands and specials. The cheapest outcome comes from treating each as a specialist. Here is where each one actually saves you the most.

The verdict

For Australian families doing a weekly shop in 2026, the most cost-effective strategy is a split shop: ALDI for staples and pantry items, Woolworths or Coles for branded goods and specials. Families shopping exclusively at Woolworths or Coles typically spend $40–$70/week more than a comparable ALDI-primary basket. Costco is worth the annual membership for households of 4+ who buy in bulk regularly. This does not apply to single-person households or anyone without ALDI access.

💡 Earn cashback on grocery delivery at ShopBack Australia

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Why a split shop wins

The Supermarket Split Strategy treats each store as a specialist rather than a one-stop shop. ALDI prices are structurally lower because it carries ~1,800 SKUs (vs Woolworths' 30,000+) and sources most of its range under private label. Woolworths and Coles compete on promotions, loyalty points, and specials — which can make specific branded items cheaper on any given week.

Woolworths vs Coles is essentially a price tie — their pricing algorithms track each other closely. The ACCC's 2025 Supermarkets Inquiry reached the same conclusion structurally, finding that Coles and Woolworths (together about two-thirds of national grocery sales) have limited incentive to compete vigorously with each other on price. The decision between them is better made on location, delivery service, and loyalty program preference.

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Where each store is cheapest

Category	Cheapest Option	Typical Saving vs Woolworths/Coles
Dry pasta, rice, canned goods	ALDI	25–40%
Bread and bakery	ALDI	20–35%
Dairy (milk, butter, cheese)	ALDI or Costco	15–30%
Fresh produce	ALDI or Woolworths specials	10–20%
Branded cereals and snacks	Coles/Woolworths on special	Variable
Cleaning products (bulk)	Costco	30–50% vs unit price
Meat (bulk packs)	Costco	20–35%
Organic / specialty items	Woolworths or Coles	ALDI doesn't stock most

The numbers show that the 20–30% ALDI advantage on staples translates to roughly $40–$70/week for a family of four — more than enough to justify an extra stop.

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Your store-by-store plan

Rule: Use ALDI for weekly pantry staples and basic fresh produce. Use Woolworths or Coles for branded items and whatever's on special that week. Consider Costco monthly if you have a household of 4+ and adequate storage.

Household Type	Best Strategy	Est. Annual Saving vs Coles/Woolworths-only
Family of 4, metro with ALDI	ALDI-primary + Coles/Woolworths specials	$2,000–$3,500
Family of 4, Costco access	ALDI + Costco monthly	$2,500–$4,000
Couple, $150/week shop	ALDI-primary	$800–$1,500
Single person, $80/week	Either — proximity wins	$300–$600
Regional with no ALDI	Coles/Woolworths + weekly specials	Limited switching benefit

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What this saves in practice

Cashback is available on Woolworths and Coles online grocery delivery through ShopBack — a low-effort way to add return on orders you're already placing.

In practice, this means: a family of four currently spending $280/week at Woolworths exclusively can realistically reduce that to $200–$220 by shifting 60% to ALDI and buying Coles/Woolworths specials for the rest. That's a meaningful annual saving from a two-stop shop adding 15–20 minutes per week.

A typical trade-off: ALDI 1L full-cream milk at ~$1.79 vs branded milk at $2.60–$3.20. For a family going through 6–8 litres/week, that difference adds up to hundreds of dollars annually on milk alone.

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When this does NOT apply

• No ALDI within reasonable distance: The split-shop saving disappears if the detour costs time or fuel equivalent to the price difference.
• Single-person households on small budgets: The absolute dollar saving from a split shop is $10–$20/week — may not justify two stops.
• Specialty dietary requirements: ALDI's limited range often doesn't cover gluten-free, vegan specialty, or specific health food categories.
• Online-only shoppers: ALDI doesn't offer home delivery; the split strategy requires at least one in-store visit.
• Costco memberships for small households: A couple buying standard quantities may not consume bulk purchases before expiry.

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Frequently asked questions

Is ALDI cheaper than Coles and Woolworths for a full weekly shop?

Yes — ALDI is typically 20–30% cheaper than Coles or Woolworths on comparable staples. However, ALDI's limited range means most households use it alongside another supermarket.

Is Costco worth it for Australian families?

For households of 4 or more who buy in bulk regularly, the annual membership typically pays for itself within a few visits. Smaller households may not use bulk quantities before expiry.

Is there a meaningful price difference between Woolworths and Coles?

Generally no — on an equivalent basket, Woolworths and Coles are typically within 2–4% of each other. Choose based on location, delivery preference, and loyalty program.

Does Woolworths or Coles have a better loyalty program?

Both Everyday Rewards and Flybuys return roughly 0.5–1% in points value. The better program is whichever one you'll actually redeem — unclaimed points return nothing.

Is ALDI produce as good quality as Coles and Woolworths?

ALDI produce quality is generally comparable for common vegetables and fruit, though the range is more limited.

Can you do a full weekly shop at ALDI in Australia?

Not easily — ALDI covers staples well but lacks most branded goods and specialty items. Most households use it alongside another supermarket.

Does ALDI offer home delivery in Australia?

No — ALDI does not offer home delivery in Australia. For grocery delivery, Woolworths and Coles are the main options.

How much is a Costco membership in Australia?

Costco membership is currently $65 per year for a standard (Gold Star) membership, subject to change. Check Costco Australia's website for the current fee.

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Key takeaways

• If you shop exclusively at Woolworths or Coles, switching to ALDI for staples can save $2,000–$3,500/year for a family of four
• If you have Costco access and a household of 4+, a monthly bulk run adds further savings on non-perishables
• If you're deciding between Woolworths and Coles, choose based on location and delivery — the price difference is negligible
• If you order groceries online, check whether cashback is available on your platform before placing the order
• If you can't access ALDI, focus on buying store-brand products and checking weekly specials — these are the most accessible savings at full-service supermarkets

💡 Check cashback on grocery delivery at ShopBack Australia

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Disclaimer

The views and recommendations expressed in this article are those of the author.

Prices, rates, promotions, and availability are subject to change. Please verify details directly with the relevant providers before making any decisions.

This article is intended for general informational purposes only and should not be considered professional, financial, or travel advice.