Most Probable Number (MPN) Calculator

The Most Probable Number (MPN) Calculator is an easy-to-use tool developed for bacteriologists to estimate microorganisms in a sample by computing the MPN value estimate using probability formulas. The calculator was developed to help public drinking water utilities monitor their water for bacterial indicators and pathogens. Subsequently, it was modified to provide MPN calculations for viral contaminants.

MPN Calculator
Settings
Saved MPNs
File Upload
Dilution Type
Ten-Fold Serial Dilution
Approximation Type
Loyer & Hamilton Limits
Confidence Level
95%
Include Confidence Limits
Yes
Include Bias Correction
Yes
Include Spearman Karber
Yes
Include Thomas Estimate
Yes
Include R Based MPN
Yes
Output Format
MPN/ml
Default to Cornish and Fisher Limit
20480
Precision
3
Maximum iterations for Cornish & Fisher
30
Maximum iterations for Loyer & Hamilton
50
Delimiter
,

MPN Results