Food storage planner

A real food store is not a shopping spree, it is arithmetic: people, times days, times calories, divided into foods that keep. This calculator does that arithmetic and hands the answer back in the units that matter at the store and in the pantry, pounds of staples, buckets, cans, and the shelf space the whole thing occupies once it is home.

Calories first, variety second

Prepper math fails most often by counting meals instead of calories. A person doing real physical work needs 2,000 to 2,500 calories a day, every day, and three months for two people is over a million calories, a pile of food far larger than a couple of shelves of canned soup. Dry staples, rice, beans, oats, flour, pasta, are the backbone because they pack roughly 1,600 calories per pound and cost pennies per thousand; canned goods carry water weight, roughly 350 calories per pound, but they need no preparation, no fuel, and no extra water, which is exactly what you want in a bad week. A resilient pantry deliberately holds both, which is what the mix selector models.

Storing it so it is still food in five years

The enemies are oxygen, moisture, light, heat, and rodents, and the defenses are cheap: food-grade 5-gallon buckets with oxygen absorbers handle staples for years; add mylar liners and grains keep for decades. A bucket holds about 30 pounds of rice or beans, which is why the calculator counts them, they are the pantry's structural unit, stackable, mouse-proof, and carryable. Cans want a cool, dark shelf and a marker-pen date on the lid. Skip the freezer as a cornerstone: off-grid, the pantry that needs no electricity is the one still there after the storm, a point the Prepping & Resilience archive makes repeatedly about every system.

Rotation: the pantry you eat is the pantry that works

The single best storage practice costs nothing: store what you already cook, and cook from storage routinely, replacing as you go. First in, first out. A pantry run this way is perpetually fresh, already familiar to every cook in the house, and its "expiration" problem simply never arrives. The one you build once and admire in the basement quietly becomes a museum of 2019.

Round it out beyond the calculator's rows: salt, cooking oil, sugar, coffee or tea, spices, and a few genuine treats, morale is nutrition when things are hard. Vitamins cover the gaps a staples-heavy stretch leaves. And water outranks all of it: a couple of weeks stored plus a serious filter and a source, sized with the water calculator, comes before the second month of beans. The garden, planned with the garden calculator, is the pantry's renewable wing, and home canning is where the two meet.

Getting a useful answer out of this

Food storage planner returns calories to store, dry staples, canned goods, and shelf space. Every one of those is a planning figure rather than a specification: it tells you the size of the problem and roughly what it will take to solve, which is what you need before you can shortlist equipment or ask a supplier a sensible question.

The single most useful habit with any calculator on this site is to run it more than once. Change one input at a time and watch which output moves. That tells you where your design is sensitive, and design sensitivity is far more valuable than a single answer, because it identifies the assumption worth spending real effort to pin down. If a modest change in one input swings the result substantially, that input deserves a measurement rather than an estimate.

It is also worth running the pessimistic version. Off-grid systems are sized by their worst case rather than their average, and a design that only works on the numbers you hoped for is a design that works for part of the year. Put in the colder temperature, the longer run, the larger household, the dimmer month, and see whether the answer is still one you can live with.

What a calculator cannot know

Any tool like this works from the inputs you give it and from published averages for everything else. It does not know your particular site, the way your household actually behaves, the corner your building was cut in, or the ten-year-old equipment already installed that does not match its datasheet. Treat the output as a well-informed starting bracket, not as a specification to order against.

Three things in particular sit outside what any of these tools can see. The first is local rules, which decide what you may build regardless of what the arithmetic says: the laws pages cover those by state, county, and town. The second is the condition and quality of what you install, which is why two identical designs perform differently. The third is how the system is wired and protected, which decides whether it is safe rather than whether it is adequate, and which is the subject of lesson six.

Where a number here comes from a constant or a rule of thumb, the method notes above say so and give the source. That is deliberate: a result you cannot check is a result you should not act on, and the arithmetic here is simple enough to verify by hand on paper if you want to.

Where to take the answer next

A single figure rarely settles anything on its own, because off-grid systems constrain each other. The load list decides the array, the array decides the controller, the battery decides what the inverter can deliver, and the climate at your site decides all of it. The system planner takes one set of inputs and produces a whole coherent plan rather than an isolated number, which is usually the better next step once you have a figure you trust.

For location-specific inputs, the site report gives any address its real 30-year sun, climate, elevation, and distance figures, including the worst-month sun hours that size an off-grid system properly. For the equipment that the result points at, the spec tables list what manufacturers publish, normalised so that units of different sizes can be compared, and each product page works its own numbers through. For what things cost this month, the price index.

And for the reasoning rather than the arithmetic, the free course runs through the decisions in the order they actually arrive, from deciding whether the life suits you through to the first year on the land. Most of the mistakes that calculators cannot prevent are ordering mistakes, made before anyone opened a calculator at all.