Contagem em Placa (UFC/mL)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
UFC/mL
About this calculator
The Plate Count is a fundamental technique in microbiology to estimate the number of microbial cells present in a sample. This calculator helps to calculate the Colony Forming Unit (CFU) per milliliter (mL) from the formed colony (col), the dilution used and the volume (V) of the sample.
The used formula is CFU = col · dilution / V, where the formed colony is converted into units of CFU/mL considering the used dilution and the volume of the sample. It is important to perform the plate count in the laboratory, using appropriate techniques to ensure the accuracy of the results.
The Plate Count is crucial in various contexts, especially in food, pharmaceutical and food industries, where the presence of microorganisms can affect the quality and safety of the products.
It is essential to consider special care when performing the plate count, such as safe handling of samples and equipment, maintaining a clean environment and performing appropriate quality controls.
Frequently asked questions
What is the formula to calculate CFU/mL?
The used formula is CFU = col · dilution / V, where col is the formed colony, dilution is the degree of dilution used and V is the volume of the sample.
When should I use the Plate Count?
The Plate Count should be performed in the laboratory, especially in food, pharmaceutical and food industries, where the presence of microorganisms can affect the quality and safety of the products.
How can I ensure the accuracy of the Plate Count?
It is essential to perform the plate count in the laboratory, using appropriate techniques and considering special care, such as safe handling of samples and equipment, maintaining a clean environment and performing appropriate quality controls.
What is the Colony Forming Unit (CFU)?
The Colony Forming Unit (CFU) is the measure of the number of microbial cells present in a sample, expressed in units per milliliter (mL).
Can I perform the Plate Count at home?
No, it is recommended to perform the Plate Count in the laboratory, as it requires specialized techniques and appropriate equipment to ensure the accuracy of the results.