Colony Forming Unit
Accurately calculate the concentration of viable microorganisms in your original sample.
Input colony count (including TNTC or zero counts), plated volume, and dilution factor to get CFU/mL or CFU/g.
Provides the corresponding Log10 value for reporting and analysis, clear interpretation for counts beyond detection limits, and warnings if counts fall outside the reliable range (e.g., 30-300 colonies).
Colony Forming Unit (CFU) Calculator
This tool accurately determines the concentration of viable microorganisms in your original sample based on colony counts, plated volume, and dilution factor.
How It Works
Input the number of colonies observed on a plate. You can also handle special cases such as "TNTC" (Too Numerous To Count) or zero colonies. Enter the volume plated and the dilution factor applied. The calculator then provides the concentration in CFU/mL for liquid samples or CFU/g for solid samples.
Calculation Formula
Log10 CFU = log10(CFU/mL or CFU/g)
Features & Warnings
- Provides Log10 value for reporting and analysis.
- Clear interpretation for counts beyond detection limits, including TNTC (> limit) or zero ( < detection limit ).
- Warnings if your colony count falls outside the standard reliable range (e.g., 30-300 colonies).
Applications
Useful for microbiology experiments, bacterial or fungal culture monitoring, and standardization of viable counts in experimental workflows.
