If the food sat out, start with the clock
Smell, taste, and “it still looked fine” are not reliable checks for perishable food. The decision starts with how long the food was outside safe hot or cold holding.
- Use 2 hours as the usual room-temperature limit for perishable food.
- Use 1 hour if the food was above 90 F (32 C), such as in a hot car or outdoors.
- Use 4 days for cooked leftovers kept in the refrigerator.
- Use 165 F (74 C) when reheating leftovers that stayed within the timing rules.
Reheating is not a reset button for food that already passed the room-temperature limit. If you already ate it and feel unwell or need personal advice, contact an appropriate clinician or health service.
Enter the timing you know
Use the earliest time you know: preparation, serving, purchase, or delivery. Count every period you know the food was unrefrigerated, including the trip home and time on the counter. If the start time is unknown, the tool cannot reconstruct it or call the food low risk. Your entries stay in this browser tab and are not uploaded.
The four U.S. numbers this tool uses
- 2 hours: the usual maximum time for perishable food at room temperature.
- 1 hour: the limit when the temperature is above 90 F (32 C).
- 4 days: the refrigerator window for cooked leftovers.
- 165 F (74 C): the reheating temperature for leftovers.
These limits do not cover every food-specific risk. Raw or undercooked ingredients, unpasteurized products, cross-contamination, recalls, and personal medical advice still matter.
What clock starts when?
Leftover questions often come down to one missing detail: when the room-temperature clock started. Use the most conservative time you can verify, then keep a note of what is still unknown.
| Situation | Start the clock from | Detail to write down |
|---|---|---|
| Restaurant leftovers | When the food was served, unless it was kept safely hot or cold. | Serve time, trip time, car temperature, and when it reached the refrigerator. |
| Takeout pickup | When the hot or cold food was prepared or purchased. | Pickup time, travel time, and whether it sat on a counter or in a warm car. |
| Delivery | When the food arrived if the earlier preparation time is not known. | Drop-off time, time outside the door, and whether it was eaten or chilled within 2 hours. |
| Home-cooked leftovers | When cooking ended or when serving began. | How quickly it was placed in shallow containers and refrigerated. |
| Unknown timing | Do not guess a safe start time. | Write what you know and use the more cautious option when limits may have passed. |
Restaurant, takeout, and delivery details
FDA pregnancy guidance says to go directly home with restaurant leftovers and refrigerate them promptly. If you will not be home within 2 hours of being served, do not take the leftovers. Eat hot takeout promptly. Count any part of the delivery or pickup journey that you know the food was not kept hot or cold.
FoodSafety.gov adds the same timing for people at higher risk of food poisoning: refrigerate perishable dining-out leftovers within 2 hours after purchase or delivery, or within 1 hour above 90 F (32 C).
Why smell and appearance are not enough
The official limits are based on time and temperature. Food can look or smell normal and still have an unsafe handling history. Do not taste food to test whether the time limit can be ignored. Reheating is not a fix for perishable food that already crossed the room-temperature limit.
If you already ate the food or feel unwell
A timing tool cannot estimate your chance of illness, interpret symptoms, or tell you whether a pregnancy was affected. Contact your doctor, midwife, local health service, poison service, or emergency service as appropriate for your situation.
Pregnancy leftovers and takeout questions
How long can takeout sit out during pregnancy?
U.S. guidance says to discard perishable food left at room temperature for more than 2 hours. The limit is 1 hour when the temperature is above 90 F (32 C), including a hot car or outdoor setting.
How long can cooked leftovers stay in the refrigerator?
FoodSafety.gov says to use cooked leftovers within 4 days. Keep the refrigerator at 40 F (4 C) or below and refrigerate perishable food promptly in shallow containers.
What temperature should leftovers reach when reheated?
Reheat leftovers to 165 F (74 C). Bring leftover sauces, soups, and gravies to a boil. Stir or turn microwaved food and check more than one spot because cold areas can remain.
What if I do not know how long delivery or leftovers sat out?
Use the earliest reliable time you know. If the timing is missing, this checker cannot fill in the gap or treat the question as resolved. When the food may have passed the 2-hour or 1-hour limit, use the more cautious option and contact a clinician or local health service if you already ate it and need personal advice.
Can reheating fix food that was left out too long?
No. Reheating to 165 F is for leftovers that were handled within the timing rules. If perishable food has already exceeded the room-temperature limit, official guidance says to discard it rather than reheat it.
Can this checker tell me whether food I already ate was safe?
No. It applies general U.S. timing rules and cannot assess an individual exposure, symptoms, food handling history, or medical risk. Contact your clinician or local health service when you need advice about an exposure or symptoms.
Turn the leftover worry into one clear note
Ask Nouri with the food, restaurant or product, cooking method, serving time, delivery time, storage time, reheating step, symptoms, and country. Keeping those details together makes the uncertainty easier to see. If symptoms, a possible exposure, a health condition, medication, or urgent worry is involved, use Nouri to organize the facts and contact an appropriate clinician or health service.
Keep checking the details
Sources reviewed
- FDA: Eating Out & Bringing In
- FDA: Cooking (Food Safety for Moms-to-Be)
- FDA: Ready-to-Eat Foods
- FoodSafety.gov: People at Risk of Food Poisoning
- USDA FSIS: Leftovers and Food Safety
- USDA FSIS: Safe Handling of Take-Out Foods
- CDC: Food Safety Tips for Dining Out
Sources checked on 31 August 2026. Open the linked source for its latest version.