How to meal plan from your pantry, in five steps

Pick seven recipes you like and you have written a shopping list, not a plan. Each recipe brings its own ingredients, most of them in pack sizes larger than the recipe needs, and none of them talks to the half bag of spinach already in your fridge.

Two things follow. You buy food you own. And you throw away food you bought last week for the recipe you did not get to, because nothing in the plan pointed at it.

The fix is not more discipline. It is inverting the order, so the food you already paid for is the input to the plan rather than an afterthought.

Each step feeds the next. Doing them out of order is how you end up back at a seven-recipe shopping list.

1. Take stock. Open every door and write down what is there, with rough quantities.
2. Mark what is on a clock. Anything fresh, opened, or near its date goes to the top.
3. Pick two anchors. Two ingredients you have a lot of, that several meals can be built around.
4. Plan meals that spend the clock items first and lean on the anchors.
5. Write the shopping list last, from the gap between the plan and the shelf.

The first stock-take is the only slow part. Open the fridge, the freezer, and every cupboard, and write down what is actually there rather than what you remember buying. Quantities can be rough. "Most of a bag of rice" is a useful entry; "rice" is not, because it does not tell you whether Thursday works.

Freezers are where this pays for itself. The food most likely to be forgotten is the food you cannot see, and a freezer with two portions of chili in it changes the plan for the week.

After that, keep it current at the moment food moves: when the shopping is unpacked and when a meal is cooked. That is the whole maintenance cost. Skip it for two weeks and the list becomes fiction, which is worse than no list, because you will plan around things you no longer have.

Once you can see everything, the useful ordering is time, not category. Fresh herbs, opened dairy, and a bag of salad are on a short clock. Root vegetables, hard cheese, and eggs have longer. Dried and tinned goods barely have one.

Plan the short-clock items into the first two or three days and the long-clock items later in the week. That single rule removes most household food waste without anyone tracking a percentage, because the food goes into a meal before it goes off.

If you are unsure how long something actually keeps, the USDA publishes real storage times rather than guesses: the FoodKeeper storage guide is the reference worth trusting over the date printed on the packet, which is usually about quality rather than safety.

An anchor is an ingredient you have in quantity that several different meals can be built around. A pack of chicken thighs, a bag of rice, a block of feta, a bag of frozen peas. Two anchors is the number that works: one leaves you eating the same dinner four nights running, three or more and you are back to a shopping list.

Anchors do the structural work. Chicken thighs and rice cover a traybake, a fried rice, and a soup, and the three meals share a shop rather than each needing their own. The variety comes from the small stuff you already own, the spices and the sauces and the half-onion.

This is also the step that makes leftovers deliberate. Cook the anchor once in quantity, then let Tuesday and Thursday be different meals built from the same pot.

Now put meals against days, and do it in clock order rather than in order of preference. The salad and the opened yoghurt get Monday and Tuesday. The chicken thighs, still sealed, can wait until Thursday. The bag of dried lentils will keep until March and does not need a day at all.

Plan fewer dinners than there are nights. Something always changes, and a plan with no slack is a plan you abandon on Wednesday, at which point the food you bought for Thursday starts its own clock. Leaving two nights open for leftovers and for whatever comes up is what makes the other five actually happen.

Check each meal against the shelf as you add it rather than at the end. A week that looks fine on paper and turns out to need three onions you do not have is a week you will quietly stop following, and the correction is much cheaper made one meal at a time.

Write the list only after the meals are chosen, and write it by subtraction: everything the plan needs, minus everything the shelf already holds. What is left is the list. It is normally much shorter than expected, and that is the point.

Doing it in this order also kills the duplicate buy, which is the most expensive habit in a kitchen. Nobody buys a third jar of cumin on purpose. They buy it because the list was written from recipes and the cupboard was never consulted.

Every step above works on paper, and plenty of people run it on paper for years. What breaks is step one after week three: keeping the stock-take current by hand is the chore people quit, and once it is stale the whole method collapses.

That is the part PrepWise automates. It holds the pantry, so recipes carry a live availability indicator instead of you cross-checking a list. It reserves ingredients when you plan a meal, so two dinners cannot claim the same chicken. It writes the shopping list as the gap between your week and your shelf. You can load the pantry from a photo of the shelf or a grocery receipt instead of typing it, which is what keeps step one from rotting.

It is on iPhone only, it is free to download, and the free tier holds 15 saved recipes and 20 assistant messages a day. The answers to the questions people ask before downloading cover the rest, including what you get without paying and whether you have to enter the whole pantry first.

If you cook the same five meals on rotation and you are happy about it, you do not need any of this. The rotation is already a plan, and your shopping list is already stable.

It also does not suit a kitchen you do not control. Shared houses where food comes and goes without a rule make the stock-take unreliable, and an unreliable stock-take is worse than none.

And it is a poor fit if you shop daily for that evening. Pantry planning trades a little admin for fewer trips; if you like the trips, you are giving something up to save something you do not want.