CFU Calculator

Use the colony count, dilution factor and plated volume to estimate the concentration of viable organisms. Formula: CFU/mL = colonies Γ— dilution factor Γ· volume plated (mL)

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Convert CFU

Use the colony count, dilution factor and plated volume to estimate the concentration of viable organisms.

Formula: CFU/mL = colonies Γ— dilution factor Γ· volume plated (mL)

Enter each required value using the unit or convention shown by the tool. The formula explains how the inputs are combined and what the result represents.

Use a small test value to confirm the direction and scale of the result before applying it to a larger calculation.

References:

Definition of Colony-forming unit

Colony Forming Unit (CFU) in Microbiology

Colony Forming Units — What Are They and How Many Do You Need?

Frequently Asked Questions FAQ

What is a CFU Calculator?
The CFU Calculator is a tool used in microbiology to estimate the number of viable microorganisms, typically bacteria or fungi, in a given sample. It helps determine the concentration of live cells or organisms that have the ability to form visible colonies on a growth medium.
What are the steps involved in CFU determination?
The CFU determination typically involves serial dilution of the sample, plating the diluted samples on suitable growth media, incubating the plates under appropriate conditions, and counting the visible colonies that result from viable microorganisms.
What units are used for CFU values?
The CFU values are expressed as the number of colony-forming units per unit volume (e.g., CFU/mL or CFU/g), indicating the concentration of viable microorganisms in the original sample.

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