How to save money on groceries without switching stores

Read the unit price, not the shelf price

It's the small number on the shelf tag, and it's the only one that lets you compare. Two boxes at the same price can hold different amounts, and a buy-two-get-one can cost more per ounce than the larger box beside it.

Bigger doesn't always win. On fresh food, buying double and throwing half away is the worst unit price there is. Compare per unit, then ask whether you'll actually eat it.

Store brand where it doesn't show, name brand where it does

The gap between name brand and store brand is enormous in some products and undetectable in others. That's where most household savings live.

• Barely noticeable: canned beans, crushed tomatoes, pasta, rice, milk, sugar, flour, frozen vegetables, cleaning supplies.
• Noticeable: coffee, chocolate, olive oil, cured meats, canned fish.
• The honest test: swap one product a week. If nobody at home mentions it, it stays.

Going less often costs less

Every trip adds unplanned purchases, however disciplined you are. Two big shops a month plus a short fresh-food run beats four full trips, and beats stopping by daily on the way home by a wide margin.

It isn't about willpower. It's time inside the store, which is the most reliable lever anyone has.

Close the list before you walk in — with quantities

A list that says "tomatoes" makes you decide in the aisle. One that says "tomatoes, 2 lb" already decided at home, with the fridge in sight and on a full stomach.

Putting a price on each item and watching the total changes behavior more than any tip: the number stops being a surprise at checkout and becomes something you steer during the trip.

Attack waste before price

Thrown-out food is money spent twice: you paid for it and you still have to replace it. In most homes it's produce, bread and dairy, and almost always because of good buying and bad sequencing.

Freezing bread on arrival, planning leafy greens for the first two days and deliberately cooking extra to freeze saves more than chasing sales ever will.

Shop from a menu, not from instinct

Shopping without knowing what you'll cook produces loose ingredients that don't add up to meals. Five dinners decided in advance turn the list into something closed, and usually cut a quarter to a third from the cart.

It doesn't need to be detailed. "Pasta, roast chicken, chili, tacos, fish" is enough to know what to buy and how much.