Inductor Impedance Calculator

Inductor Impedance Calculator. An inductor resists alternating current in proportion to its size and the signal frequency — the Inductor Impedance Calculator quantifies that resistance so you can design or analyze AC circuits with confidence. Enter your inductance value (with unit: pH, nH, µH, mH, or H) and frequency (Hz, kHz, MHz, or GHz) to get the primary output: Inductive Reactance (XL) in ohms. Secondary outputs include Angular Frequency (ω), Impedance Magnitude, and Phase Angle. Also try the Inductance — Air Core Inductor.

Inductor Impedance Calculator inputs

Results

Inductive Reactance (XL)

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Angular Frequency (ω)

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Impedance Magnitude

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Phase Angle

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What is inductive reactance?

Inductive reactance (XL) is the effective resistance offered by an inductor to alternating current. It increases with frequency and inductance value, calculated using the formula XL = 2πfL. See also our Inductive Reactance Calculator.

How do I calculate inductive reactance?

Use the formula XL = 2πfL, where XL is inductive reactance in ohms, f is frequency in hertz, and L is inductance in henries. Higher frequency or inductance results in higher reactance.

What is the difference between inductive reactance and capacitive reactance?

Inductive reactance increases with frequency while capacitive reactance decreases with frequency. Inductors oppose changes in current, while capacitors oppose changes in voltage.

What is the inductive reactance in DC circuits?

In DC circuits (frequency = 0 Hz), inductive reactance is zero. This means inductors act like short circuits to direct current, offering no opposition to steady-state DC flow.

How do I calculate inductance from reactance?

Rearrange the formula to L = XL/(2πf). If you know the inductive reactance and frequency, you can calculate the inductance value of the coil.

What is the SI unit of inductive reactance?

The SI unit of inductive reactance is the ohm (Ω), same as electrical resistance. It represents the opposition to current flow in the inductor.

Why does inductive reactance increase with frequency?

Higher frequency means faster changing current, which induces a stronger back EMF in the inductor according to Lenz's law. This creates greater opposition to current flow, increasing reactance.

What is the phase relationship in an inductor?

In a pure inductor, current lags voltage by 90 degrees (π/2 radians). The impedance has a phase angle of +90°, making it purely reactive with no resistive component. You might also find our calculate Wire Self-Inductance Self Inductance useful.