Food temperature excursion summary calculator

Calculate time outside thresholds and maximum observed temperature with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use time outside thresholds and maximum observed temperature to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Intervals [duration minutes, temperature °C]
[[10,3],[15,8],[5,12]]
User lower threshold (°C)
0
User upper threshold (°C)
5
Time outside thresholds (minutes)
20
Maximum observed temperature (°C)
12
Temperature excess above upper limit (°C minutes)
80

Try another scenario

Intervals [duration minutes, temperature °C]
[[10,3],[16,8],[5,12]]
User lower threshold (°C)
0
User upper threshold (°C)
5
Time outside thresholds (minutes)
21
Maximum observed temperature (°C)
12
Temperature excess above upper limit (°C minutes)
83
Calculation method

Calculation method

Time outside thresholds (minutes)

Piecewise-constant observation intervals; sum duration outside user thresholds and integrate positive upper-limit excess.

Maximum observed temperature (°C)

Piecewise-constant observation intervals; sum duration outside user thresholds and integrate positive upper-limit excess.

Temperature excess above upper limit (°C minutes)

Piecewise-constant observation intervals; sum duration outside user thresholds and integrate positive upper-limit excess.

Symbols and units
a
Intervals [duration minutes, temperature °C]
b
User lower threshold (°C)
c
User upper threshold (°C)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Summarizes supplied observations; does not determine food safety, discard decisions or pathogen growth. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
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