Reactance Calculator (Capacitive & Inductive)
Calculate capacitive reactance (Xc) and inductive reactance (Xl) at a frequency, the net reactance, and the resonance point.
Capacitive reactance X_c–
Inductive reactance X_l–
Net reactance (X_l − X_c)–
Resonance (X_l = X_c)–
Reactance
Reactance is the opposition a capacitor or inductor presents to alternating current, measured in ohms but varying with frequency. Capacitive reactancefalls as frequency rises; inductive reactance rises.
Capacitive: X_c = 1 / (2π·f·C)
Inductive: X_l = 2π·f·L
In a series LC circuit the net reactance is X_l − X_c: positive means the circuit looks inductive, negative means capacitive, and zero is resonance, where they cancel at f₀ = 1 / (2π·√(L·C)).
Related
Find the tuning point with theLC resonant frequency calculator, or combine parts first with thecapacitor andinductor series & parallelcalculators.