Calculate the z-value given two equivalent thermal processes
Reference temperature, °C
Process temperature, °C
Reference process time, minutes
Process time, minutes

For more information on thermal processing refer to the accompanying article on this site. Note this calculator is intended for educational use only. Its use is not warranted and it is not a subsitute for using a qualified food technologist for thermal process validation. The calculator is available, on request, as a free unlocked Excel spreadsheet to anyone who has donated to the DSFT website.

How to cite this article

Mullan, W.M.A. (2020) [On-line] UK: Available: Accessed: