log fold reduction calculator
Free calculate log reduction values for microbial inactivation, sterilization efficiency, and disinfection effectiveness in laboratory and industrial applications.
Microbial Count Data
CFU/mL
Number of microorganisms before treatment
CFU/mL
Number of microorganisms after treatment
Method used for microbial reduction
Duration of treatment
Temperature during treatment (if applicable)
Log Reduction Results
Enter microbial count data to calculate log reduction
Log Reduction Guidelines
Log Reduction Levels
- • 1-log: 90% reduction (10-fold)
- • 2-log: 99% reduction (100-fold)
- • 3-log: 99.9% reduction (1,000-fold)
- • 4-log: 99.99% reduction (10,000-fold)
- • 5-log: 99.999% reduction (100,000-fold)
Applications
- • Water treatment: 3-6 log reduction
- • Food processing: 5-7 log reduction
- • Medical devices: 6-12 log reduction
- • Pharmaceutical: 6+ log reduction