Series RLC Circuit Impedance Calculator Company Capacitive and Inductive Reactance Calculator Inductive reactance ( XL ) In Ω Resistance ( R ) In Ω Capacitive Reactance ( Xc ) In Ω Impedance Z = Ω At resonance frequency ' f ', XL = XC. When XL = XC then the Impedance, Z = R. Series RLC Circuit Resonance Frequency Calculator Web Site Inducatnce ( L ) H (Henry) Capacitance ( C ) In μF (microfarad) Resonance frequency f = Hz