How Long Are Leftovers Good For? Storage Calculator
Apply USDA cooling gates and the three-to-four-day refrigerated-leftover window to show a freeze reminder and outer use-by point. Inputs stay in your browser.
USDA says refrigerated leftovers can be kept for three to four days; the fourth-day point is shown as the outer planning limit.
Context matters.
- Reheat leftovers to 165°F / 74°C. Discard food left out beyond the applicable one- or two-hour limit.
Sources & scope
The calculation guide and this source trail show what the result means, where the rule came from and when it was last reviewed. This is source-and-calculation QA, not a claim of medical, legal, tax or other professional review; time-sensitive decisions still belong with the linked authority.
A visible path from input to answer.
Apply USDA cooling gates and the three-to-four-day refrigerated-leftover window to show a freeze reminder and outer use-by point. The page keeps the calculation scope and its limits beside the result so the output can be checked, copied or revisited.
- Read the record. The calculator uses Leftover type, Cooked or prepared date, Cooked or prepared time, How quickly was it refrigerated? and Current condition supplied in the form.
- Apply the scope. It applies the United States food-safety planning — USDA cooling and refrigerated-leftover limits; condition gates override the calendar reference and the explicit date, unit and counting conventions shown in the result.
- Expose the checkpoints. Intermediate rows, warnings and timeline events stay visible; the emphasized row identifies the primary checkpoint when one exists.
USDA says refrigerated leftovers can be kept for three to four days; the fourth-day point is shown as the outer planning limit.
- Outer refrigerated limitSep 3, 2026 · 8:00 PM
Calculation purpose: Apply USDA cooling gates and the three-to-four-day refrigerated-leftover window to show a freeze reminder and outer use-by point. This is a conditional reference output; the linked source and the situation-specific facts control the decision.
Calendar inputs use plain year-month-day semantics. Leap days, month ends, date-pair order and unsupported dates are checked before the result is shown.
Rule set 1.1.0 · Last reviewed 2026-08-23 · Next review due 2027-02-23. The source panel below contains the linked evidence.
What to know before using the result.
How long are leftovers good for in the refrigerator?
USDA says leftovers may be kept refrigerated for three to four days. CalcSpan uses day three as a freeze-or-prioritize reminder and day four as the outer planning limit.
What if the food was left out too long?
The calculator stops the countdown when refrigeration was later than two hours, or later than one hour in temperatures above 90°F / 32°C.
Can smell prove leftovers are safe?
No. Spoilage signs mean discard, but the absence of an odor does not prove safety. Time and temperature control still matter.