EMERGENCY PREPAREDNESS · CALCULATOR
See Which Preparedness Gap Bites First
Rate the seven domains of household readiness from nothing to robust. The assessment returns one honest score, your weakest domain, and the gaps that would hurt before the others.
Household readiness
38%
Comms and drill scores zero: the gap that bites first
- Zeros on the board
- 1closing zeros is the cheapest progress
- Domains under two
- 5each one is below the 72-hour line
- Strongest domain
- Warmth and shelter (2)
- Steps to all-twos
- 6rating points to reach three days everywhere
Score what exists today, honestly. A zero found here is infinitely cheaper than a zero found during the event.
Most households know their emergency score as a feeling. Slightly anxious, mostly stocked, a pile of good intentions somewhere between the toolbox and the hall cupboard. Feelings are terrible inventories, and the events that test preparedness do not ask how you feel about the boiler.
This assessment replaces the feeling with seven numbers. Water, food, power and light, warmth, medical, communication and drill, documents and cash. Each gets an honest rating from nothing to robust, and together they produce one readiness percentage.
The percentage is not the product. The product is the sentence the tool produces underneath it: the weakest domain, the one that would bite first. Fixing preparedness in priority order is cheaper, faster and calmer than fixing it in the order the shopping aisle happens to suggest.
The formula
Readiness = average of domain scores / 3, equally weighted across the seven domains
- domain
- one of the seven preparedness areas: water, food, power, warmth, medical, comms, documents.
- 0 to 3 rating
- nothing, starter, roughly three days covered, or robust with redundancy. The anchors are in the reference table.
- equal weighting
- every domain counts one seventh. Emergencies do not grade on a curve, and a plan is only as strong as its thinnest area.
- weakest domain
- the lowest rating, and the gap that defines your real resilience. Always the first fix.
Why seven domains and not seven hundred items
Item-level checklists drown in specifics: does a household really need forty-two metres of paracord? Domain scoring asks a better question. Could this family drink, eat, see, stay warm, treat a wound, coordinate, and prove who they are for three days unaided?
Domains also match how emergencies actually attack. A storm does not remove your lantern. It removes power, then light, then warmth in that order. Judging preparedness as capabilities tracks the sequence of failure, while judging it as inventory tracks a shop.
The equal weighting encodes the same lesson. Real events exploit your thinnest area, and almost never your thickest. A two-week water wall next to a zero in communications is a thirstily informed household.
One capability hides in plain sight: the drill. Ratings that count objects but skip rehearsed behaviour systematically overestimate. A kit nobody has opened and a plan nobody has spoken aloud both score high on the shelf and fail in the kitchen at midnight.
- Score capabilities, not collections. Emergencies attack the first.
- Equal weights because events target your thinnest area, not your proudest.
- The drill is a domain, not an afterthought.
What a rating actually means at each level
Zero is nothing: no stored water beyond the kettle, the torch with last year's batteries. Honest zeros are valuable. They are the cheapest gaps on your board and they say so plainly.
One is starter. A few bottles, a shelf of cans, one lantern. Better than zero and roughly one disrupted evening deep. Many households rate themselves twos while living at ones, because rating by purchase feels different from rating by use.
Two is the seventy-two-hour line: three days of the domain covered with supplies that are serviceable, reachable and actually usable by this household. Getting every domain to two is a real and achievable project for this year.
Three is robust: a week or more, plus redundancy, plus a habit. A filter backup behind stored water. Food that rotates by being eaten. Power with two recharge routes. Documents copied in two places. Threes are maintained, not bought.
Reading your result: the shape beats the score
The percentage summarises; the profile decides. Sixty percent earned by six domains at three and comms at zero is a different sixty from sevens of ones. The first has a named, cheap, urgent fix. The second has a budget problem spread politely across the board.
So read the weakest line before the headline. Then the runner-up, because the two together are the month's shopping list and the quarter's plan. Everything above two can wait, cap on or no, without changing how the next event feels.
The assessment has a built-in honesty trap worth naming: you rate yourself. The pull to round up is real, and it is the same pull that produces the feeling-score this tool exists to replace. Score what you checked this month, and re-score after the next fix.
Track the number four times a year, alongside the rotation habits elsewhere on this site. Readiness drifts downward silently. Supplies expire, batteries die, children outgrow layers. A score that stayed flat for a year probably quietly fell.
Worked example: the typical ready-ish household
Take the default ratings: water one, food two, power one, warmth two, medical one, comms zero, documents one. The sum is eight of a possible twenty-one, and the score says thirty-eight percent ready.
The shape tells the real story. The household eats reasonably well and stays warm, but it cannot see for long, cannot coordinate with anyone, and holds thin water. A storm exposes exactly those three in that order.
The priority list falls out: a radio and a five-minute family plan closes the zero, then two or three days of water raises the domain that biology will punish first. Both are weekend projects costing less than most single gadgets.
Run the same family through the deep-readiness sample and the score nears eighty-five. Note that even that profile's weakest domains, power and medical at two, name the next chapter. Robustness is not a destination you buy. It is a board you keep clearing.
Blind spots, drift and the difference between stock and skill
The seven domains cover the common failures, but every household has an eighth: its own specific dependency. The CPAP, the infant, the well pump, the elderly parent two roads away, the dog medication. Add it as a private rating and average it in honestly.
Stock versus skill is the deepest distortion in self-scoring. Owning a kit you cannot use scores two on the shelf and zero in reality. Fire extinguisher, first-aid training, the manually opened car door, the filter you have actually run once: skills raise the stock's true value.
Drift moves in one direction. Without a calendar nudge, every domain decays: rotation lapses, batteries leak, copies vanish in a move. The assessment is a maintenance tool first and a measuring tool second, which is why the same four inputs four times a year beat any single heroic audit.
And keep perspective at the bottom of the board. A forty percent score in October is not a failure. It is forty percent more than the household that never looked, and the next event will find the difference on its side.
Reference values
Domain anchors for the 0 to 3 ratings
| Level | Meaning | Typical picture |
|---|---|---|
| 0 Nothing | Relies on normal systems holding | Kettle water, drawer torch, no plan spoken aloud |
| 1 Starter | One evening of coverage | A few bottles, some cans, purchases made but untested |
| 2 Three days | The 72-hour standard, serviceable and reachable | Rotated stock, charged light, blankets counted per person |
| 3 Robust | A week plus redundancy plus habit | Filter behind stored water, two charge routes, copies in two places, drill rehearsed |
Key terms
- Domain
- One of the seven capability areas the assessment scores: water, food, power, warmth, medical, comms, documents.
- Readiness score
- The average of the seven ratings against a perfect three. A summary; the weakest domain is the decision.
- Robust
- Rating three: a week or more of coverage with redundancy and a maintenance habit behind it.
- Drill
- The rehearsed behaviour of the household: meeting point, contacts, who carries what. The most under-scored domain.
Tips and common mistakes
Field-tested tips
- Score in the month you stock. Ratings decay silently, and a flat number usually means a falling one.
- Close zeros first. They cost the least, teach the most and define the whole board until they are gone.
- Add your private eighth domain: the household's specific dependency, from the CPAP to the well pump.
- Test the stock you score. A kit nobody has opened is a two on the shelf and a zero in the kitchen.
Common mistakes
- Rating purchases instead of readiness, then discovering half the stock was unopened and the torch was dead.
- Polishing the strongest domain because it feels good, while the weakest quietly defines the next event.
- Scoring the objects and skipping the drill, behaviour and skills that actually operate the objects.
- Treating the assessment as a one-off instead of a seasonal habit that catches decay while it is cheap.
Frequently asked questions
Why are all seven domains weighted equally?
Because emergencies exploit the weakest area rather than the average, and no household can predict which domain its event will press on. Equal weights keep the score honest about its own shape: a board with a zero is never truly seventy percent ready. If a weighting favoured your strongest domain, the number would flatter you precisely where flattery is expensive.
How is this different from the 72-hour kit checker?
The kit checker audits physical stock against the three-day standard: litres, meals, lanterns counted. This assessment covers the wider territory that stock alone never completes: the drill nobody has rehearsed, the documents and cash, the recharge habits, the medical skills behind the kit. Run the checker to size your shelves and this tool to judge your household. Many families are startled by how different those two results look side by side.
What is a good score to be aiming for?
Every domain at two is the honest target: three days covered everywhere, with the zeros closed. That sits at sixty-seven percent and survives most real events well. Pushing threes is worthwhile where your geography demands it, remote roads or storm coasts, but a household holding flat twos is ahead of one with scattered threes and a zero hiding under them. Close the zeros before chasing the threes.
Should renters and apartment households score differently?
They score the same domains with different tools, and that is a fact worth admitting in the ratings. Water stored in bottles not tanks, warmth as layers and a sealed room rather than a wood stove, documents as a scanned folder rather than a fire box. The scale measures capability, and a clever renter hitting twos everywhere is genuinely as ready as a house with a cellar.
About this calculator
- Written by
- Spare Theory Editorial Team · Research & Testing Desk
- Last reviewed
- 2026-10-16
How we calculateThe seven domains follow the capability structure used across published household preparedness guidance: water, food, power and light, warmth and shelter, medical, communication and plan, documents and finances. Level anchors map the widely recommended 72-hour standard at rating two. Equal weighting reflects the weakest-domain nature of real events.
Reference basisGovernment and agency household preparedness checklists and capability frameworks · Red Cross guidance on emergency kits and family communication plans