Cheapest Supermarket in the UK This Month: Basket Price Comparison

Overview

A supermarket price comparison is only helpful if it matches the way you actually shop. National headlines often focus on a standard basket of staples, but many households do not buy the same mix each week. One person may rely on basics and frozen food, another may buy more fresh produce, baby items, toiletries or branded cupboard staples. That is why the best grocery basket comparison is a personal one.

The aim of this article is not to claim a fixed winner or invent a monthly ranking. Instead, it shows you how to build a clear basket-price method you can use across major UK supermarkets and update in a few minutes. Done properly, this turns supermarket shopping from guesswork into a small household savings system.

For most readers, the real question is not simply which supermarket is cheapest. It is one of these:

• Which supermarket is cheapest for my weekly essentials?
• Does switching stores save enough to justify the extra travel or delivery cost?
• Are own-label baskets cheaper enough to beat a branded offer elsewhere?
• Should I split my shop between two retailers or keep it simple in one place?

Those are better questions because they lead to savings you can actually keep. A £3 basket saving disappears quickly if you spend more on petrol, impulse buys or a delivery slot you did not need.

As a rule, you will get the clearest result by comparing the same basket across a short list of realistic options. That might mean Aldi, Lidl, Tesco, Asda, Sainsbury’s, Morrisons, Ocado, Iceland, Co-op or Marks and Spencer, but only include stores you can genuinely use. There is no point comparing a supermarket that does not deliver to your postcode or is too far away to visit regularly.

This makes the article naturally evergreen. You can return each month, quarter, season or budgeting reset and rerun the same process with fresh prices. When grocery inflation shifts, promotions change or your household routine changes, your answer may change too.

How to estimate

The simplest way to estimate the cheapest supermarket in the UK for your household is to compare a fixed basket of products and then add the real shopping costs around it. Keep the method consistent. The more consistent the input, the more trustworthy the result.

Use this five-step process:

1. Build a basket of 20 to 40 items you buy often. Include the products that shape most of your grocery bill, not one-off treats. Think milk, bread, eggs, rice, pasta, cereal, chicken, fruit, vegetables, nappies, detergent and toilet roll.
2. Match products as closely as possible. Compare like with like. If one basket includes a branded 500g pasta and another includes own-label 1kg pasta, the result will be distorted. Use the closest size, quality tier and pack type you can find.
3. Record item price, pack size and total basket cost. If the sizes differ slightly, calculate the unit price too. That helps you spot cases where a bigger pack looks expensive but is better value.
4. Add the extra cost layer. Include delivery charge, service charge, minimum-spend top-up, petrol, parking or the cost of a second stop if needed.
5. Adjust for how you really shop. If you always use a loyalty price, employee benefit, student discount, NHS discount, first-order code or free delivery deal, include it only if it is realistically repeatable for you.

A practical spreadsheet can be very simple. Use columns for:

• Item name
• Brand or own-label tier
• Pack size
• Supermarket A price
• Supermarket B price
• Supermarket C price
• Unit price
• Notes on substitutions or missing items

Then add summary lines at the bottom for:

• Total basket price
• Delivery or travel cost
• Any realistic discount applied
• Final effective cost

That final effective cost is the number that matters most. It is the best answer to the reader’s real-life question: what will this shop actually cost me?

If you shop online, this method is especially useful because online shopping discounts UK shoppers rely on can make a meaningful difference. A supermarket with a slightly higher basket total may become cheaper once you apply a free delivery code, a first order discount code or a recurring saver pass. If you want to reduce that extra delivery spend, see Free Delivery Codes UK: Shops That Offer Delivery Discounts Right Now.

Likewise, if you are setting up a new grocery account or trying a retailer for the first time, a one-off code can reduce the trial cost. Our guide to First Order Discount Codes UK: Retailers That Still Offer New Customer Savings is useful here, but treat one-off discounts separately from your ongoing monthly comparison. They are good for testing a supermarket, not always for deciding the long-term cheapest option.

One final tip: compare at the same time of day if possible. Prices, stock and substitutions can all make comparisons messy if you check one shop on Monday morning and another late on Friday night.

Inputs and assumptions

The quality of your supermarket price comparison UK result depends on the assumptions you choose. If you make those assumptions clear, the comparison stays fair and easy to update later.

Start with the basket itself. A good staple basket usually includes items from several categories:

• Fresh basics: milk, bread, eggs, bananas, potatoes, onions, carrots
• Cupboard staples: pasta, rice, tinned tomatoes, cereal, tea, coffee
• Protein: chicken, mince, beans, tuna, yoghurt
• Frozen or convenience: frozen veg, chips, ready meals, pizza
• Household: washing-up liquid, laundry detergent, toilet roll
• Personal care: toothpaste, shampoo, nappies if relevant

That spread matters. Some supermarkets look cheap on food staples but become less competitive once household and baby items are added. Others are strong on branded promotions but weaker on fresh produce or convenience lines.

Next, decide whether you are comparing own-label, branded or a mixed basket.

An own-label basket usually gives the cleanest reading if your main goal is to find cheap groceries UK households can buy week after week. A branded basket is useful if you are loyal to specific products and rarely switch. A mixed basket often reflects real life best, because many households buy basics in own-label form while sticking with a few favourite brands for cereal, coffee, cleaning products or snacks.

Then set your assumptions for the hidden cost factors:

• Travel: Is one store significantly farther away?
• Delivery: Are there slot fees, service charges or bag charges?
• Memberships or loyalty pricing: Do you need an app, card or subscription to get the lower price?
• Minimum spend: Do you end up adding extra items to qualify for checkout or delivery?
• Substitutions: Are regular out-of-stocks likely to force pricier replacements?
• Store format: Is the smaller local branch more expensive than the larger superstore?

These details often explain why one shopper swears a chain is the cheapest supermarket UK option while another has the opposite experience. They are not necessarily disagreeing on prices; they are shopping under different conditions.

It also helps to separate repeatable savings from temporary savings.

Repeatable savings include regular own-label choices, loyalty prices you always use, stable delivery subscriptions and a consistent low-cost store choice. Temporary savings include flash offers, launch-week deals, coupon stacking and one-off retailer promotions. Temporary savings are still valuable, but they should sit in a different column so you do not overestimate your normal monthly savings.

For example, if you like chasing supermarket offers this week and seasonal product launches, keep a note of them, but do not assume they will be there every month. Our piece on Where to Find Launch Week Discounts at Supermarkets: A Shopper’s Checklist can help you spot those short-lived opportunities without confusing them with your baseline grocery costs.

Finally, think about household-specific discounts. Students, NHS staff and Blue Light Card holders may have extra saving routes depending on the retailer, gift card promotions or linked brand offers. These may not always apply directly to groceries, but they can reduce adjacent household spending and change where you consolidate purchases. Relevant guides include Best UK Student Discounts by Brand: Clothing, Tech, Food and Travel and NHS and Blue Light Card Discounts UK: The Updated Brand List.

Worked examples

Below are practical examples of how to use the method. These are not current rankings or live prices. They are model scenarios to help you estimate your own answer.

Example 1: The single-store weekly shop

A couple buys 28 staple items each week, mostly own-label, plus a few household essentials each month. They compare three supermarkets available nearby.

They record:

• Basket total at Store A
• Basket total at Store B
• Basket total at Store C
• Petrol or delivery cost for each
• Any loyalty-only price reduction they always use

After adding travel, they discover the lowest shelf-price basket is not actually the cheapest final shop because the store is out of the way. The second-cheapest basket becomes the cheapest realistic option. This is common, especially outside towns where driving to a discount chain may cost more than expected.

Lesson: never stop at item totals alone. Calculate the full transaction cost.

Example 2: The family split-shop method

A family of four buys a larger monthly shop online but tops up locally once or twice a week. Their online basket includes bulky, repeat items like cereals, toilet roll, nappies and cleaning products. Their local top-up is fresh milk, bread, fruit and offers they see in store.

When they compare supermarkets, they use two baskets:

• Main basket: 35 repeat items ordered online
• Top-up basket: 10 fresh items bought locally

This shows that one supermarket is best for the main stock-up order, while another is cheaper for top-up shopping. Instead of forcing all spending into one retailer, they use a split strategy that matches their habits.

Lesson: the cheapest supermarket price comparison may produce more than one winner, depending on basket type.

Example 3: The branded-basket shopper

A shopper strongly prefers certain branded coffee, cereal, soft drinks and cleaning products. They find that own-label comparisons are not very useful, because they rarely switch those products.

So they build a mixed basket with:

• Branded core items they always buy
• Own-label fresh and basic cupboard staples
• One realistic voucher or loyalty discount if regularly available

They find one supermarket looks expensive on basics but often runs stronger multi-buy or card-price promotions on the branded products that matter to them. Over a month, that changes the result.

Lesson: a comparison only works if it reflects your non-negotiables.

Example 4: The online convenience comparison

A busy household wants to know whether online grocery shopping is still worth it. They compare a physical store visit with an online order and discover the online order costs more in fees, but reduces impulse spending and avoids midweek convenience-store visits.

They estimate:

• Average in-store basket cost
• Average impulse add-ons
• Average emergency top-up spending
• Online basket cost plus delivery

Even though the online basket is slightly pricier, the total monthly grocery spend is lower because the household makes fewer unplanned trips.

Lesson: the cheapest-looking basket is not always the cheapest behaviour.

This is a good reminder that saving money is often about systems, not only prices. A calm, repeatable routine usually beats constant deal-chasing if the deal-chasing leads to extra trips or wasted food.

When to recalculate

The practical value of a monthly tracker is that your answer can change. Recalculate when the inputs shift enough to matter. You do not need to compare every day, but you should revisit your basket when one of these triggers appears:

• Your staples change. New school routines, packed lunches, a baby, training goals or dietary changes can all alter which supermarket suits you.
• Prices move noticeably. If your usual shop suddenly feels more expensive, run the basket again rather than assuming it is temporary.
• Promotions or loyalty rules change. A useful card-price mechanic, delivery pass or recurring discount can change the effective winner.
• You move house or change commute. Travel cost and convenience can shift faster than shelf prices.
• You start shopping online more often. Delivery economics deserve a fresh look.
• Seasonal spending arrives. Christmas, Easter, back-to-school and summer holidays often change basket composition.

A sensible rhythm is:

• Monthly: quick check of 10 to 15 core items
• Quarterly: full basket comparison
• Seasonally: reset for holiday, school or heating-related household spending

To make this easy, keep a saved comparison sheet and update only the prices. Highlight the items with the biggest monthly swings. Those usually tell you more than tiny changes across the full basket.

Before you shop this week, take these action steps:

1. Write down 20 to 30 items you buy most often.
2. Mark each item as own-label, branded or flexible.
3. Choose up to four supermarkets you can realistically use.
4. Check shelf or online prices on the same day.
5. Add delivery, petrol or parking.
6. Apply only discounts you can genuinely repeat.
7. Compare the final total, not just sticker prices.
8. Keep the sheet and revisit it next month.

If you enjoy combining grocery savings with broader household deals, it is also worth checking adjacent saving opportunities on cheapdiscount.co.uk, especially around delivery savings, first-order discounts and seasonal supermarket launches. Those small extras can lower the total cost of running a home, even when they do not directly change your core grocery basket.

The best answer to “which supermarket is cheapest” is therefore a living one. Build your own basket, track it consistently, and treat the result as a monthly decision rather than a fixed rule. That approach is more useful than any generic ranking because it reflects the only basket that really matters: yours.