HACCP Critical Limit Calculator

In HACCP (Hazard Analysis and Critical Control Points) planning, a "critical limit" is the minimum time and temperature combination a food must reach during cooking to reduce pathogens to a safe level -- fall short of either the temperature or the hold time, and the critical limit is not met, regardless of how close you got. This calculator checks your measured internal temperature and hold time against the required combination for the food type you select: poultry requires 165°F reached instantaneously, ground meat requires 155°F for 17 seconds, whole-muscle meat and seafood require 145°F for 15 seconds, and reheated food (for hot holding) requires 165°F for 15 seconds -- figures cited from FDA Food Code ¶3-401.11(A) and ¶3-403.11(A) and used in food-safety training. Both conditions must be satisfied together; meeting the temperature alone with insufficient hold time (or vice versa) still fails the critical limit check, and the calculator reports the specific temperature or time shortfall so you know what's missing.

Separately, it tracks cumulative "danger zone" time -- how long the food has spent between 41°F and 135°F, the FDA Food Code's temperature-control-for-safety (TCS) range where bacterial growth accelerates -- against a commonly used 4-hour cumulative guideline, reporting how much danger-zone time remains before that threshold is exceeded. An estimated log reduction (a rough measure of how much the pathogen population has been reduced) is also shown, but it's a simplified planning estimate rather than a precise microbiological calculation, since real log reduction depends on the specific pathogen, food matrix, and exact time-temperature history in ways this calculator does not model.