Symmetry factor (As) also known as asymmetry factor or tailing factor is a coefficient that shows the degree of peak symmetry.
As per USP, tailing factor is calculated using the following equation:
AS = W0.05/2d
Where,
W0.05 = width of the peak at one-twentieth of the peak height
D = distance between the perpendicular dropped from the peak maximum and the leading edge of the peak at one-twentieth of the peak height
An As value of 1.0 signifies symmetry. When As > 1.0, the peak is tailing. When As < 1.0, the peak is fronting.
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