Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Tail half width (min)

Required number input.

Front half width (min)

Required number input.

Compute the peak asymmetry factor as the tail half width divided by the front half width measured at ten percent peak height. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Asymmetry factor

The resulting asymmetry factor returned as a number.

• Chromatographic plate, resolution, retention, and peak-shape formulas summarize an observed chromatogram. They do not model detector response, integration choices, extra-column broadening, gradient elution, overload, or uncertainty in locating peak boundaries.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• USP Tailing Factor

  Compute the USP tailing factor as the total peak width at five percent height divided by twice the front half width.

• Selectivity Alpha

  Compute chromatographic selectivity alpha as the retention factor of peak B divided by the retention factor of peak A.

• Plate Height H

  Compute the plate height H in micrometers as the column length converted to micrometers divided by the plate number.