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Calculate the probable prevalance of a pathogen or fault-causing organism in a food when all the samples test negative

To use add your values to the empty fields below


Probability Default value is normally 0.95 or 95%
Number of samples tested
Mass or volume of samples used

Note this calculator is part of a tutorial/workshop on the: Reliability of microbial sampling in assuring food safety.




Caution. This free calculator is intended for educational use only and is not a substitute for a company employing a qualified food technologist or microbiologist.

How to cite this article

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