Pick your mode, enter how long the power was out, check the categories that apply, then click Calculate. Formula: Total Estimated Cost = Sum of every active cost category you enter.
Who Is This For?
Not sure what a field means? Tap the ⓘ next to its label.
Outage Duration
Cost Categories
Turn on each category that applies to you and enter your own numbers — nothing is included unless its checkbox is on.
Your Results
Each bar shows how much of your total estimated cost comes from that category, so you can see at a glance which one is driving the number.
Results are for reference and planning purposes only. Actual costs will vary. See full disclaimer below.
Rough, commonly-cited ranges compiled from industry and energy-provider guidance during this session's competitive research — not a substitute for entering your own numbers above. Your actual result will differ based on which categories genuinely apply to you.
| Outage Length | Typical Residential Range | Likely Drivers |
|---|---|---|
| Under 4 hours | $0 – $50 | Usually minimal — food generally stays safe |
| 4 – 24 hours | $100 – $300 | Refrigerator spoilage, some lost work time |
| 1 – 3 days | $300 – $900 | Fridge + freezer spoilage, hotel stay, missed work, supplies |
| Over 3 days | $900+ | All residential categories, plus generator fuel over multiple days |
A deeper look at where power outage costs actually come from, and how to think about them for a home versus a business.
Why Outage Costs Add Up Faster Than People Expect
Most people think of a power outage as an inconvenience, not an expense — until the freezer contents are gone, a night in a hotel is booked, and a day of remote work is lost, all from the same event. None of these costs shows up on a utility bill, which is exactly why they're easy to underestimate until they're totaled up in one place.
Residential vs. Business Costs — What's Actually Different
A household's costs are mostly one-time and personal: spoiled food, a hotel room, missed hours of pay. A business's costs scale with time and headcount: every hour down is another hour of lost revenue and idle payroll, on top of any inventory or process losses. That's why Business & Facility mode uses per-hour and per-employee inputs instead of the fixed, one-time categories used for a home.
Food Spoilage: What Actually Spoils and When
USDA guidance puts a closed refrigerator's safe window at about 4 hours without power, and a full freezer at about 48 hours (roughly 24 if it's only half full). A chest freezer packed tightly holds cold longer than a nearly-empty upright unit. If in doubt about specific items, when in doubt throw it out is the standard food-safety guidance — this calculator only asks for the dollar value of what was actually discarded, not a prediction of what will spoil.
Weighing a Generator Against What Outages Already Cost You
If you already know roughly how often your area loses power and for how long, running this calculator for a typical event and multiplying by your outage frequency gives a rough annual cost of doing nothing. Compare that number to the cost of sizing a generator with the Generator Sizing Calculator, or a battery system with the Solar Battery Storage Calculator, to see how many years of outages it would take to offset the equipment cost. This is a planning exercise, not a financial guarantee — actual outage frequency and equipment pricing both vary by location.
Common Mistakes When Estimating Outage Costs
The most frequent errors are: counting the full outage length as lost work hours instead of just the hours that actually interrupted a workday, forgetting emergency-supply purchases because they feel too small to matter, and — for a business — overlooking idle labor cost because employees were still being paid regardless of output. Also common: assuming a refrigerator spoiled without confirming the outage actually exceeded its safe window.
This guide is provided for educational and reference purposes and reflects general industry guidance current as of this session's competitive research. Actual costs depend on your specific circumstances.