Calories are the unit; meals are not
Almost every food store gets planned in meals, and almost every one comes out wrong, because a meal has no fixed size. Three meals a day for four people for two weeks is 168 meals, a number that tells you nothing about how much to buy or where it will go. Calories are additive, they are printed on the packaging, and they convert cleanly into weight and volume once you know what the food is.
The arithmetic runs in one direction. Household size and a per-person daily figure give calories per day. Multiply by days for the total. Split that total across the kinds of food you actually intend to store, and each kind converts to pounds through its calories per pound and to cubic feet through its bulk density. The default here is 2,000 calories per adult per day, which is a planning convention rather than a nutritional prescription, and it is an editable field because cold weather, physical work and who is in the household all move it.
Children are handled with a proportion rather than their own figure, and that proportion is crude on purpose. A four-year-old and a fifteen-year-old are not the same planning problem, and a teenager will out-eat most adults. If your household skews one way, change the percentage rather than trusting the default.
Why the mix decides the size of the store
Foods differ enormously in calories per pound, and that single spread governs how large a two-week store is.
| Food | Roughly, calories per pound | Pounds for 10,000 calories |
|---|---|---|
| Cooking oil, peanut butter | 2,600 to 4,000 | 2.5 to 4 lb |
| Rice, pasta, dried beans | 1,500 to 1,700 | 6 to 7 lb |
| Bars and dry snacks | 1,800 to 2,000 | 5 to 6 lb |
| Canned meat and fish | 500 to 900 | 11 to 20 lb |
| Canned vegetables and soups | 150 to 450 | 22 to 65 lb |
The figures above are approximations for planning; read the actual labels for the actual products, which is why the calculator takes calories per pound as an input rather than assuming it. The pattern, though, is stable: anything packed in water is mostly water, and canned goods buy convenience and variety at a large cost in weight and shelf. That is not an argument against them. It is an argument for knowing which part of the store is doing the calorie work and which part is doing the eating-it-willingly work, and for not being surprised when a modest calorie target turns into a hundred pounds of shelf load.
Volume follows a different curve from weight. Pasta is light and bulky; canned goods are heavy and comparatively compact; oil is heavy and dense. A store optimised only for weight ends up unreasonably bulky, and one optimised only for volume ends up unreasonably heavy. The calculator gives you both so you can see which one is your binding constraint before you buy anything.
Shelf space, and the packing efficiency nobody allows for
Cubic feet of food is not cubic feet of shelf. Tins are cylinders, boxes are the wrong shape, bags slump, and a shelf that is 12 inches between decks cannot hold a 13 inch box no matter how much volume is technically free. The default packing efficiency here is 70 percent, which is reasonable for tins and boxes on an open shelf and generous for anything in awkward packaging.
The output that matters more than the shelf count is the weight per shelf. A two-week store for four people runs to something like a hundred pounds, and a fortnight is a modest target. At a month, on wire shelving of the kind sold for garages, the load per shelf is worth checking against what the shelving is rated for. The material storage space calculator handles the general version of that problem if the pantry is competing with everything else in the garage.
Rotation is the part that fails quietly
Every store degrades on a schedule, and the schedule differs by item. Oils and anything with fat in it turn over fastest. Bars and packaged snacks carry short dates. Rice, dried beans and most canned goods run long. The calculator counts each line forward from a purchase date and tells you which item comes due first, because that is the date the whole store has to be visited by, not the average one.
The mechanism that works is not a spreadsheet. It is storing food the household already eats and cooking from the store, so it turns over as part of ordinary life and gets replaced on the ordinary shopping run. Stores built from things nobody in the house likes are the ones found unopened and expired three years later. Attach a twice-yearly check to a date already on the calendar, the same hook the family emergency plan uses for the rest of the kit, and use it to walk the shelves rather than to read a list.
One practical dependency: a store of canned food and no working can opener is not a store. The same goes for anything that needs cooking during an outage. If the power is off and the cooker is electric, the part of the store that needs no heat is the part you actually have, which is worth checking against the power outage timeline before deciding the mix.
Questions people ask
How many calories should I plan per person per day?
Two thousand per adult per day is the conventional planning figure and the default here, but it is a planning convention rather than a nutritional prescription, and this page treats it as an input for exactly that reason. Cold conditions and physical work push it up, and a household sitting in an unheated but not freezing house doing very little pushes it down. Children are handled as a percentage of an adult, which is deliberately crude: adjust it if your household is all toddlers or all teenagers, because the two cases differ by more than a factor of two.
How much does two weeks of food weigh?
For a household of two adults and two children on the default mix, roughly a hundred pounds and a couple of cubic feet before packing losses. The number swings hard on the mix rather than on the days. Shift the store toward canned goods and the same calories can weigh two or three times as much, because canned food is mostly water by weight. Shift it toward rice, pasta and oil and it gets light and cheap and much less pleasant to eat for a fortnight. Both weight and volume are shown so you can see which constraint binds first in your space.
What food should actually go in the store?
Things the household already eats, that keep, and that need no cooking or minimal cooking, in that order of importance. The calorie total can be met a dozen ways and most of them fail on the second week for reasons that have nothing to do with arithmetic. Include a manual can opener, something for the people who will not eat unfamiliar food, and pet food if there are animals. Dietary restrictions, allergies, infant formula and anything medically prescribed are decided by the people concerned and their clinicians, not by a default mix on a page.
How do I keep the store rotated?
Store what you eat and eat what you store, so the stock cycles through the kitchen without anyone tracking dates. Beyond that, use a twice-yearly check tied to something already on the calendar and walk the shelves rather than reading a list. This calculator shows which line comes due first, which is the date that matters, because a store is only as current as its shortest-lived item. Oils and packaged snacks are usually the ones that set that date; rice, beans and canned goods run far longer.
Does this include water?
No, deliberately, because water dwarfs everything else in a household store and has its own constraints. A gallon weighs 8.34 pounds, so a week of it for a family of four outweighs a fortnight of food several times over, and it raises structural and mobility questions that food does not. The emergency water storage calculator handles that separately, including cooking water, which is worth checking if your food mix is heavy on dried goods that need rehydrating.