The most reliable way to reduce your grocery bill is to change a few habits in a set order: measure what you currently spend, switch to cheaper versions of the products you buy most, plan meals around what you already have, and cut food waste. Done over four weeks, most households can lower their weekly shop without coupons or living on beans.
Each week below adds one habit. By the end you will have a routine, a realistic weekly budget and a clear idea of where the savings came from.
Week 1: Measure before you cut
Shop as normal for one week, but keep every receipt, including top-up shops, lunches and takeaways. Many people only count the big weekly shop and miss the small trips that quietly add up. At the end of the week, total the receipts and sort them into rough groups: the main shop, top-ups, food eaten out and drinks or snacks.
Also look at your bank statements for the last two months to see your typical monthly food spending. Put that figure into the budget planner so you can see it alongside your other costs. This is your baseline; every saving from here can be measured against it.
Week 2: Downshift your top 20 items
Look at your receipts and pick the 20 items you buy most often. For each one, try the next level down: branded to own brand, own brand to the supermarket's value range. Judge on the product, not the packaging. Some swaps you will not notice, and a few you will want to switch back, which is fine.
Compare using the unit price on the shelf label (price per kilo, per litre or per 100 sheets) rather than the pack price. Bigger packs are not always cheaper per unit, and multi-buy offers can cost more than the single item at a different shop. Loose fruit and vegetables are often cheaper per kilo than pre-packed.
- Store cupboard basics such as pasta, rice, tinned tomatoes, beans and flour are where value ranges usually match branded quality.
- Frozen fruit, vegetables and fish are cheaper than fresh and do not go off.
- Check the world foods aisle for spices, rice and lentils in bigger bags.
- If you use a loyalty card, compare the loyalty price with the same item at a discounter.
Week 3: Check where you shop
The supermarket you use can matter as much as what you buy. In Which?'s monthly price comparison for September 2026, a basket of 93 items cost £159.48 at Aldi and £161.48 at Lidl with a Lidl Plus card, compared with £223.38 at Waitrose. Prices move every month, so treat these as a snapshot and see our supermarket value comparison for the wider picture.
You do not have to switch completely. A common approach is to do the main shop at a discounter and buy the few items they do not stock elsewhere. Online shopping can also help, as you see a running total and are not tempted by displays, but watch delivery charges and minimum spends.
Week 4: Plan meals and stop waste
Before you shop, check what is already in the fridge, freezer and cupboards, and plan meals that use it up. Then plan the rest of the week around a few versatile ingredients that appear in more than one meal. Write a list and stick to it.
- Plan for the nights you will be busy, so you are not tempted by a takeaway.
- Cook once, eat twice: double a recipe and freeze portions.
- Keep a 'use first' shelf in the fridge for food near its date.
- Learn the difference between 'use by' (a safety date) and 'best before' (a quality date). Food past its best before date is usually fine to eat.
- Freeze bread, milk and leftovers before they go off.
Set a weekly budget you can keep
After four weeks, compare your new weekly spending with your Week 1 baseline. Set your budget slightly above your best week rather than at it, so you have room for the odd treat or price rise. Paying for food from a separate account or card makes it easy to see how much is left.
Move the difference somewhere it will not get spent. If you are saving £15 a week, that is £780 a year. The savings goal calculator shows what that could become, and SYM can turn it into a daily amount to put aside with one tap.
What tends to save the most
| Change | Effort | Why it works |
|---|---|---|
| Fewer top-up shops | Low | Each trip adds impulse buys |
| Own-brand and value swaps | Low | Same product at a lower unit price |
| Main shop at a discounter | Medium | Lower prices across the whole basket |
| Meal planning and leftovers | Medium | Less waste and fewer takeaways |
For more ideas on wasting less, read how to reduce food waste. If money is very tight, our guide to free help with food costs covers Healthy Start, free school meals and other support.
Frequently asked questions
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