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CFU/mL Dilution Calculator

Formula

The formula to calculate CFU/mL is:

$\text{CFU/mL} = N \times D$

Where:

$\text{CFU/mL}$ is the concentration of bacteria in a sample (colony-forming units per milliliter)
$N$ is the number of colonies counted
$D$ is the dilution factor

What is CFU/mL?

CFU/mL stands for colony-forming units per milliliter and is a measure of the number of viable bacteria or fungal cells in a sample. It is a common unit used in microbiology to estimate the concentration of microorganisms in a liquid culture. The CFU/mL value helps in understanding the level of contamination or the efficiency of bacterial growth under various conditions.

Example Calculation

Let's assume the following values:

Number of Colonies (N) = 150
Dilution Factor (D) = 1000

Using the formula to calculate CFU/mL:

$\text{CFU/mL} = 150 \times 1000 = 150,000$

The CFU/mL is 150,000.