Calculators
Rules of thumb are how households end up with equipment that does not fit. These work out figures for your own home instead. Everything runs in your browser. Nothing is stored, nothing is sent, and no account is needed.
See what's availableAvailable now
Each one lives inside the section it belongs to, so the guidance around it stays close. This page is the shortest way to reach them. Anything still being built is named further down, without a link, so you can see what is coming and what is not here yet.
Energy
Whether a battery station or generator will actually carry your household. Four checks: the voltage gate, daily watt-hours, continuous output, and startup surge. Running-watt figures are traced to DOE, ENERGY STAR and Cooperative Extension rather than to companies that sell the equipment. Enter a specific unit and it tells you what will run and for how long. Prints to a single page you can tape inside a cabinet door.
Open the calculatorWater
Where your household actually stands on water, in about a minute. Returns a readiness score along with the specific gaps behind it, so the result is a list of next steps rather than a grade. Useful before you buy anything, because most households find the gap is not storage.
Take the auditHow these are built
The numbers behind these tools come from federal agencies, certification programs, university extension services, and manufacturer nameplate data. None of them came from a company that profits when you buy a larger unit. Where sources disagree, the tool says so instead of picking a comfortable middle.
No result appears without the arithmetic that produced it. Each page sets out the method in full, so you can work the same figures with a pencil and get the same answer. A tool you cannot check is a tool you have to trust.
Everything runs in your browser with no account, no server call, and nothing saved about you. A page you have loaded once will work again from cache during an outage, which is when a household is most likely to need it.
Still being built
These have no link because they do not exist yet. When one is finished it moves up the page and gets a card.
Water Storage Calculator
How much to store for your household size, climate, and the length of outage your area actually produces.
Pantry Depth Calculator
Turning a target number of weeks into a shopping list, working from what your household already eats.
Heating Fuel Estimator
Cordwood, propane, or kerosene needed to hold one room at a livable temperature for a given number of days.