# Inductor Q

The quality factor or "Q" of an inductor (links to http://www.mw0llo.com/inductors.aspx) of given inductance and resistance at a certain frequency is given by:

MathML formulaFormula ImageStraight text formula
$Q = 2πfL R$ Q = Inductive reactance XL / R = 2πfL / R

Where:

f = frequency, Hertz