Power Outage Food Safety Calculator
Keep or toss verdict with rule and tip from outage hours and appliance.
What it does
Outage food safety runs on three clocks: a closed fridge holds safe temperatures about 4 hours, a full freezer about 48, a half freezer about 24. Past each line, perishables go from risky to garbage.
The tool above takes outage hours with the appliance. It returns a keep or toss verdict with the rule and next step beside them.
The default of 3 hours in the fridge reads likely safe with a thermometer check. Six hours reads toss perishables, while 30 hours in a full freezer still reads safe.
The clocks follow federal food safety outage guidance with the national charts matching each limit. Both demand unopened doors, 40 F checks, and the when in doubt rule.
How to use
- Note when power failed, not when noticed.
- Pick the appliance and its fullness.
- Keep doors closed the whole time.
- Read the verdict first.
- Check 40 F or ice crystals before eating anything.
Formula
- 4 / 48 / 24
- Safe hours: fridge, full freezer, half freezer.
- 40 F
- Keep-or-toss thermometer line.
- unopened
- Every opening spends cold fast.
Thermometers overrule clocks: food above 40 F over two hours tosses regardless. Dry ice and coolers buy time outside these numbers.
Worked example
Example: 3 hours, fridge
Defaults: 3 hours, fridge unopened.
- Rule: closed fridge gives 4 h.
- Compare: 3 sits inside 4.
- Verdict: likely safe with doors closed.
- Next: check 40 F or ice crystals before eating.
- Tool shows the safe verdict with the 4 h rule.
Reference table
| Appliance | Rule | Past it |
|---|---|---|
| Fridge unopened | 4 h | Toss perishables |
| Full freezer | 48 h | Toss with thaw |
| Half freezer | 24 h | Toss with thaw |
Limits
- Guidance, not guarantees; thermometers decide.
- Openings shorten every number here.
- Hot kitchens fail faster than cool ones.
- Medicines follow pharmacist rules, not food ones.
Common mistakes
- Taste testing safety into food poisoning.
- Opening doors to check every hour.
- Refreezing thawed raw meat casually.
- Trusting ice cream texture as a gauge.
- Forgetting the outage started hours earlier.
Try it yourself
Quick checks. Answers sit tucked under each question.
Fridge 6 hours?
Past 4 h: toss meat, dairy, leftovers.
Full freezer 30 hours?
Inside 48 h: likely safe, keep closed.
Half freezer 30 hours?
Past 24 h: toss with thaw.
Questions
How long is fridge food safe?
About 4 hours unopened. Past that, toss perishables.
Freezer without power?
48 hours full, 24 half, doors closed.
Can I refreeze thawed food?
Only with ice crystals or under 40 F, cooked promptly; quality drops.
What tosses first?
Meat, poultry, dairy, eggs, leftovers: anything perishable past limits.
What keeps?
Unopened condiments, jams, hard cheese, fresh fruit: check each chart.
Thermometer or clock?
Thermometer wins: above 40 F over 2 hours tosses regardless of clocks.