Calculate the equivalent proccessing time at a higher (or lower) temperature given the reference temperature, processing time at the reference temperture and the Z-value
Reference temperature, °C
New process temperature, °C
Reference process time, minutes
Z-value, °C

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. (2016) [On-line] UK: Available: Accessed: