Power Outage Food Safety Calculator
Find out how long fridge and freezer food stays safe during a power outage.
Know exactly what to keep and what to discard for each type of stored food.
The Danger Zone for food is 40°F to 140°F (4°C to 60°C). Bacteria multiply rapidly in this range — doubling every 20 minutes at 98°F (37°C).
How long appliances stay safe:
| Appliance | Keep Closed | How Long Food Stays Safe |
|---|---|---|
| Refrigerator | Yes | Up to 4 hours |
| Chest freezer (full) | Yes | 48 hours (2 days) |
| Chest freezer (half full) | Yes | 24 hours |
| Upright freezer (full) | Yes | 48 hours |
| Upright freezer (half full) | Yes | 24 hours |
The single most important rule: Keep the doors closed. Every time you open the refrigerator during a power outage, cold air escapes and the safe time window shortens.
Refrigerator food safety by outage length:
| Outage Duration | Status |
|---|---|
| 0–2 hours | All food safe, no action needed |
| 2–4 hours | Food likely still safe if door stayed closed |
| 4+ hours | Discard all perishables (meat, dairy, leftovers, eggs, etc.) |
Foods that MUST be discarded after 4 hours:
- Raw or cooked meat, poultry, seafood
- Milk, cream, soft cheese, yogurt, sour cream
- Cooked pasta, rice, potatoes, casseroles
- Mayonnaise, tartar sauce, hollandaise
- Opened cream-based sauces and soups
- Custards, puddings, cheesecake, mousse
- Fresh-cut fruits and vegetables
- Pies with meat, egg, or custard filling
Foods that are SAFE even after extended outage (pantry-stable):
- Unopened peanut butter, jelly, jam
- Hard and processed cheeses (not sliced)
- Fruit juices
- Canned goods (intact, not bulging)
- Bread, rolls, cakes, muffins, tortillas
- Butter and margarine
- Fresh uncut fruit and vegetables
- Vinegar-based dressings and condiments
- Dried herbs and spices
Frozen food rules:
If frozen food still contains ice crystals and feels refrigerator-cold (below 40°F / 4°C) — it is safe to refreeze. If it has thawed completely and been above 40°F for 2+ hours — do NOT refreeze. Cook immediately or discard.
“When in doubt, throw it out”: foodborne illness from spoiled food is a serious health risk. You cannot always smell or see bacteria in spoiled food.
Keeping food cold longer:
- Add bags of ice or dry ice to the refrigerator
- Move refrigerator items to a cooler with ice
- A full freezer stays cold longer than a half-empty one
- Freeze water bottles ahead of hurricane/storm season to use as cooling blocks
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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