A grocery bill rarely jumps in one aisle. It leaks a little on every trip: the second jar of something you already own, the herbs that wilted, the sale item that never got a meal.
Your own number depends on where you live and who is eating, so this routine works with whatever your budget is. Instacart's guide to saving on groceries, updated on September 28, 2026, is titled as a list of 12 tips. A list of tips does not say what to do on Tuesday, though, so here is the same ground in the order a week actually runs.
Saturday, inventory the fridge
Open the fridge, the freezer and the pantry and write down what is there, with a star next to anything that will not last the week. Half a cabbage, a bag of spinach, a pound of ground meat. That starred list decides the first meals. The 2015 tips on spending less call this shopping your kitchen first; the new part is writing it down.
Plan three dinners, not seven
Seven planned dinners fall apart by Thursday. Plan three, add one cooked-ahead base (see Sunday), and leave the rest of the week for leftovers and the starred items.
Write the list by store section
Produce, dairy, meat, pantry, frozen. Walking the store in one loop means fewer detours past things you did not plan to buy. Put the quantity next to each item, such as "carrots, 2 pounds", so you do not grab the 5-pound bag by default.
Read the unit price, not the sticker
The small number on the shelf tag, price per ounce or per pound, is the only fair comparison between sizes. The math is one formula: unit price = package price รท package weight. Say you are choosing between a 32 oz bag of rice and an 80 oz bag. Take the price on each tag, divide the first by 32 and the second by 80, and the smaller result is the cheaper rice per ounce. The tag often does this for you, but when the two tags use different units (one per ounce, one per pound), convert first: 1 pound is 16 ounces.
The same division works across forms of the same food. A whole chicken includes bone, so its per-pound price overstates the meat you get, but you also get a carcass for stock. And a big size only wins if you finish it.
Swap by sale, not by recipe
Decide the category, not the exact dish: "a braise" instead of "beef stew". If chicken thighs are cheap this week, the braise is chicken. If pork shoulder is, it is pork. The method stays the same, and so does the slow cooker.
Sunday, cook one base
One pot of beans, one tray of roasted vegetables or one batch of rice turns Monday and Wednesday into assembly jobs. Cook it once, and it becomes tacos, a grain bowl or soup. A big pot of chili can do the same job; the game-day slow-cooker chili feeds a crowd.
Thursday, the use-it-up dinner
By Thursday the fridge shows what is left. Fried rice, a frittata, soup or a hash takes nearly any combination of scraps. Anything that still will not be eaten goes into the freezer that night, labeled with the date.
Where to start
Do not adopt all seven at once. Start with the Saturday inventory: it costs nothing, takes ten minutes, and makes every other step easier to follow.
