Use this calculation for cell-culture or microscopy observations collected with one counting rule, assay gate, calibration, and unit convention. It is suited to documenting dilution, growth, labeling, geometry, or population fractions.

CFU per mL

A finite measured or assumed value greater than or equal to 0.

Culture volume

A finite measured or assumed value greater than or equal to 5e-324, expressed in mL.

The implementation follows this calculation rule: Estimate the total colony-forming units in a culture from concentration and volume.

Total CFU

The calculated total cfu.

Counts and fluorescence measurements can be biased by clumping, debris, segmentation, gating, background signal, saturation, sampling fields, or unequal viability. A calculated percentage does not identify the biological mechanism behind a change. The output is explicitly an estimate or proxy; preserve that label when reporting it.

Retain representative images or cytometry plots and include biological replicates. Orthogonal viability, proliferation, apoptosis, or direct counting assays can distinguish effects that a single cell metric conflates.

• CFU Per mL

  Estimate colony-forming units per milliliter from a plate colony count, dilution factor, and plating volume.

• Cell Dilution C1V1=C2V2

  Solve C1V1=C2V2 for the stock volume needed to reach a target concentration.

• Cell Concentration From Dilution

  Recover the original cell concentration by scaling a counted dilution.