Inductive and Capacitive Reactance Calculator

In an AC circuit, inductors and capacitors oppose changing current with a frequency dependent resistance called reactance, measured in ohms. This calculator finds it for both. Inductive reactance rises with frequency and equals two pi times frequency times inductance, while capacitive reactance falls with frequency and equals one over two pi times frequency times capacitance. Pick whether you are working with an inductor or a capacitor, enter the component value and the signal frequency, and the tool returns the reactance. This is the key number for designing filters, matching networks, crossovers and tuned circuits, because reactance sets how much an AC signal is blocked or passed at a given frequency. At resonance the inductive and capacitive reactances are equal and cancel out. Enter your values, choosing convenient units, and read the reactance instantly in your browser.