CFU/g Calculator

Formula

The formula to calculate the CFU/g is:

\[ \text{CFU/g} = \left( \frac{\text{Number of Colonies} \times \text{Dilution Factor}}{\text{Volume of Culture (ml)}} \right) \]

Where:

Number of Colonies is the count of colonies observed on a plate.
Dilution Factor is the factor by which the original sample was diluted.
Volume of Culture is the volume of the diluted sample plated (in milliliters).

What is CFU/g?

CFU/g stands for colony-forming units per gram and is a measure of the viable bacterial or fungal numbers in a sample. It is commonly used in microbiology to estimate the number of viable microorganisms in a sample and is important for assessing the safety and quality of food products, as well as the microbial load in environmental samples.

Example Calculation

Let's consider an example:

Number of Colonies: 50
Dilution Factor: 100
Volume of Culture: 1 ml

Using the formula to calculate the CFU/g:

\[ \text{CFU/g} = \left( \frac{50 \times 100}{1} \right) = 5000 \]

This means that the CFU/g for this scenario is 5000.