Leftover food-safety guides
Clear explanations of the core food-safety rules used by LeftoverCalculator, with direct links to the published U.S. government guidance behind each number.
How long leftovers lastThe 3–4 day refrigerator rule, day-4 questions, and why smell tests are not enough
How long leftovers can sit outThe 2-hour room-temperature rule, the 1-hour hot-weather limit, and rapid cooling
Reheating leftoversWhy published guidance uses 74°C / 165°F and how to heat dense dishes evenly
Freezing leftoversContinuous freezing at −18°C / 0°F, quality windows, and safe thawing methods