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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Calculate Colony-Forming Units (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)

Use balanced quantities and compatible units before applying the calculation. For laboratory-style estimates, measurement precision and the chosen stoichiometric assumptions affect the final value.

Check the units and conservation relationship behind the calculation, then substitute the inputs into the displayed formula.

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 does CFU Calculator calculate?
Use the colony count, dilution factor and plated volume to estimate the concentration of viable organisms.
What is the formula for CFU Calculator?
The formula used by the calculator is: CFU/mL = colonies Γ— dilution factor Γ· volume plated (mL)
What inputs does CFU Calculator need?
Enter colony count, dilution factor and plated volume to estimate viable concentration.
How can I verify the CFU Calculator result?
Check the units and conservation relationship behind the calculation, then substitute the inputs into the displayed formula.
How should I round the CFU Calculator result?
Use the significant figures justified by the input measurements and round the final result rather than intermediate values.

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