Inductive Reactance Calculator

Created by Luciano Mino
Last updated: Nov 05, 2022

Our inductive reactance calculator can effortlessly obtain the inductive reactance of an inductor for you.
Within this short text, we will briefly cover:

  • Inductive reactance definition;
  • How to find inductive reactance using the inductive reactance formula; and
  • Learn more about the relationship between impedance and inductive reactance.

Let's start!

Inductive reactance definition

Inductive reactance (XLX_{L}) is a property of electrical circuits that describes how inductors resist changes in current:

  • If the current increases, the inductor will oppose it and try to keep the current from increasing; or
  • If the current decreases, the inductor will oppose it and try to keep the current from decreasing.

As in resistance, the units for inductive reactance are ohms (Ω).

How do you find the inductive reactance value? You will need to know the inductance and the frequency of the AC signal. Let's see how together they describe inductive reactance.

🔎 See our capacitive reactance calculator to understand how the same concept applies to capacitors.

Inductive reactance formula

The inductive reactance formula is:

XL=2πfLX_{L} = 2πfL


  • ff is the frequency of the AC signal in hertz (Hz);
  • LL is the inductance in henries (H); and
  • XLX_{L} is the inductive reactance.

💡 You can switch between units using the toggle feature next to each input in our inductive reactance calculator.

As you can see, inductive reactance increases with frequency and inductance. The higher the inductance or frequency, the higher the inductive reactance.

Give it a try! Input two different inductances in the inductive reactance calculator and see how the reactance changes accordingly.

What is impedance? How does it relate to inductive reactance?

Impedance is the total opposition that a circuit offers to the flow of an alternating current. The impedance of a circuit is represented by the letter Z.

Z=R+jXZ = R + jX

It consists of two components: resistance and reactance.

  • Resistance (R) is the real part of impedance and represents the opposition to current due to resistors (read more about this in our resistor wattage calculator); and
  • Reactance (X) is the imaginary part of impedance and represents the opposition to current due to inductive reactances and capacitive reactances.

🙋 Our inductive reactance calculator uses admittance instead of impedance. Admittance is the reciprocal of impedance. This means it describes how easily a circuit allows current to flow through it.

Luciano Mino
Inductance (L)
Frequency (f)
Reactance (Xʟ)
Admittance (Bʟ)
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