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 formula | Formula Image | Straight text formula |
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$Q=\frac{2\pi fL}{R}$ | Q = Inductive reactance X_{L} / R = 2πfL / R |

Where:

f = frequency, Hertz

L = inductance, Farads

R = resistance, Ohms