How long do leftovers last in the fridge?

What official guidance says

There is no single UK and US leftover-storage number. The UK sources say 48 hours or two days after prompt cooling and refrigeration. USDA says 3 to 4 days in the refrigerator. RecallBite keeps that difference visible rather than turning it into a one-size-fits-all answer.^{[1] [2] [3]}

UK: use leftovers within 48 hours or two days

Food Standards Agency guidance for England, Northern Ireland and Wales says leftovers can be eaten cold when they have been cooked properly, cooled and put in the fridge within two hours. It says to eat leftovers within 48 hours or freeze them if that will not be possible.^[1]

NHS Inform, citing Public Health Scotland, says not to keep leftovers longer than two days. It says to cool cooked food as quickly as possible within two hours, then put it in the fridge. It also says to keep the refrigerator between 0°C and 5°C.^[2]

United States: 3 to 4 days with prompt refrigeration

USDA FSIS says leftovers can be stored in the refrigerator for 3 to 4 days. It says they should be refrigerated within two hours of cooking or of leaving a hot-holding appliance. Perishable food left at room temperature for more than two hours should be discarded. The US limit becomes one hour when the temperature is above 90°F or about 32°C.^[3]

FDA says keep the refrigerator at or below 40°F or 4°C. It applies the two-hour rule to leftovers and other foods that need refrigeration.^[4]

Cool first, then count the days

Refrigerator-storage guidance cannot correct food that stayed warm for too long. The UK sources say to cool cooked food as quickly as possible and have it in the fridge within two hours. NHS Inform says splitting food into smaller portions can help it cool faster.^{[1] [2]}

USDA says divide large amounts into shallow containers so they reach the safe refrigerator temperature more quickly. It says hot food can go directly into the refrigerator or be rapidly chilled in an ice or cold-water bath before refrigeration.^[3]

Reheating and freezing leftovers

In the UK, FSA and NHS Inform say to reheat leftovers only once and make sure they are steaming hot throughout.^{[1] [2]} USDA says reheated leftovers should reach 165°F or about 74°C and says sauces, soups and gravies should be brought to a rolling boil.^[3]

Freeze leftovers before the relevant refrigerator period ends if you will not use them in time. FSA says to freeze leftovers if they will not be eaten within 48 hours. USDA says leftovers can be frozen for 3 to 4 months for best quality.^{[1] [3]} For the UK food-type boundaries that apply later, read Can you refreeze thawed food?

Why smell is not a safety test

FDA says food can make you ill even when it does not look, smell or taste spoiled because disease-causing bacteria differ from spoilage bacteria. An obvious bad smell, mould or other change is a reason to discard food. A normal smell is not proof that it is safe.^[4]

Do not use a sniff test to override a UK use-by date. That is a separate label-based safety rule. Read the guide to best before, use by and best by dates for the country difference.

What changes after a power cut?

The normal refrigerator timetable does not apply automatically after a power cut. Check how long the refrigerator was without power, whether the door stayed closed and any temperatures you know. Read food safety after a power cut and how to protect food during a power cut for the linked UK guidance.

For a US reference point, FDA says refrigerated perishable food, including leftovers, should be discarded if it has been above 40°F for four hours or more after a power outage.^[4]

Practical conclusion

In the UK: use leftovers within 48 hours or two days when they were cooled and refrigerated promptly. In the US: USDA says 3 to 4 days when leftovers were handled and chilled safely. In both countries, do not extend the time because food looks or smells normal.^{[1] [2] [3] [4]}

If a leftover relates to a possible product recall, a date on the container may help you identify it but does not confirm whether it is affected. Compare the product name, lot code, batch code, barcode and date with the official notice. You can search current recalls on RecallBite.