Scientific, information & consultancy services for the food industry

Calculator for determining the probability of detecting a uniformly distributed pathogen in a food

Concentration of pathogen (CFU / kg)

Number of samples
Weight of sample, g



NOTE! Pathogens may not be distributed uniformly in foods and these results should be regarded with caution. No account has been taken of plating efficency of pathogens on growth media which will lower the probability of detection further. The mathematics behind this calculator are described in the article on sampling.

How to cite this article

Mullan, W.M.A. (2015) [On-line] UK: Available: Accessed: