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Simplified version of the Dairy Science and Food Technology F and P value calculator.

This is a simplified version of the Dairy Science and Food Technology F and P value calculator. To use you must first generate a simple data input grid by selecting the time interval, in minutes, used for your temperature measurements e.g. 3 minutes and the total process time e.g. 120 minutes. Adjust the reference temperature and Z-value and add your temperature-values. The software will then calculate the equivalent lethality at the reference temperature and using the Trapezoid rule, the cumulative lethality for your process. Note a D-value is not required for F or P calculation.

The number of log reductions of a target microbial group or organism can also be calculated if the user has the appropriate D-value. Excel spread sheet F calculators, programmed using both Simpson's and the trapezoid rules are available for download.

Other On Line F calculators that are even easier to use are available as below:

Reference temperature (RT,°C)
D-value, minutes at RT
(Ignore unless you need to calculate number of log reductions!)
Z value, °C
Time interval , minutes
Max time, minutes
Time, minutes Temperature, °C Lethal Rate

How to cite this article

Mullan, W.M.A. (2011) [On-line] UK: Available: Accessed:

This calculator is intended for educational use only. It is not warranted in any way. Only use if you understand and accept Dairy Science and Food Technology site use conditions.

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