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.

Stock concentration

A finite measured or assumed value, expressed in cells/mL.

Target concentration

A finite measured or assumed value, expressed in cells/mL.

Final volume

A finite measured or assumed value, expressed in mL.

The implementation follows this calculation rule: Solve C1V1=C2V2 for the stock volume needed to reach a target concentration.

Stock volume

The calculated stock volume in mL.

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. Ratios and percentages become unstable when their denominator is small, uncertain, or defined differently between samples.

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.

• Cell Concentration From Dilution

  Recover the original cell concentration by scaling a counted dilution.

• Cell Volume Sphere

  Compute the volume of a spherical cell in femtoliters, where one cubic micrometer equals one femtoliter.

• CFSE Dilution Factor

  Estimate cell division count from CFSE fluorescence dilution using the base two logarithm of the initial over current intensity.