Parallel Inductor Calculator

Welcome to this tutorial on calculating the equivalent parallel inductance. In the field of electrical engineering, inductors are fundamental components used in various applications, such as power supplies, filters, and signal processing circuits. When dealing with multiple inductors connected in parallel, it becomes essential to determine their combined or equivalent inductance. This tutorial will guide you through the concept, formula, and real-life applications of calculating the parallel inductance.

Parallel Inductor Calculator
Enter Inductance of All Inductors value in H (E.g: 2,41,3,11,5,4,2,7)
Parallel Inductor Calculator Results
Total Inductance = H

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Learn how to calculate the equivalent parallel inductance using this engineering tutorial. Understand the formula, see an example, and discover real-life applications

Interesting Facts

Did you know that inductors store energy in a magnetic field? When the current flowing through an inductor changes, the magnetic field around it also changes. This change in the magnetic field induces an electromotive force (EMF) in the inductor, opposing the change in current flow. Inductors are represented by the symbol "L" in electrical schematics and have units of Henry (H).

Formula: Equivalent Parallel Inductance

To calculate the equivalent parallel inductance of multiple inductors, you can use the following formula:

1 / Lp = 1 / L1 + 1 / L2 + 1 / L3 + ... + 1 / Ln


  • Lp is the equivalent parallel inductance
  • L1, L2, L3, ..., Ln are the individual inductance values of the parallel inductors

Example: Calculation of Equivalent Parallel Inductance

Let's consider an example where we have two inductors connected in parallel. Inductor 1 has an inductance of 10 mH (millihenry), and inductor 2 has an inductance of 20 mH.

Using the formula mentioned above, we can calculate the equivalent parallel inductance as follows:

1 / Lp = 1 / 10 × 10-3 + 1 / 20 × 10-3

Calculating further:

1 / Lp = 100 / 10 + 50 / 10

1 / Lp = 150 / 10

Now, we can find the reciprocal of both sides of the equation:

Lp = 10 / 150

Simplifying the fraction:

Lp = 1 / 15

Therefore, the equivalent parallel inductance is 1/15 H or approximately 66.67 mH.

Real-Life Application

Understanding how to calculate the equivalent parallel inductance is crucial in various practical scenarios. One common application is in designing audio crossover networks for speakers. Audio crossovers separate the audio signal into different frequency ranges, directing each range to the appropriate speaker driver (woofer, tweeter, etc.). These crossover networks often consist of inductors connected in parallel, and calculating their equivalent parallel inductance helps ensure the desired frequency response and impedance matching.

For example, when designing a crossover network, you may have different inductors for the woofer and tweeter. By calculating their equivalent parallel inductance, you can determine the crossover frequency and ensure that the audio signals are properly directed to each driver, resulting in a well-balanced sound output.

Additionally, parallel inductors find applications in power supply circuits. They are used to filter out noise and stabilize the voltage output. Calculating the equivalent parallel inductance in such circuits helps in optimizing the performance and efficiency of the power supply, ensuring reliable and clean power delivery.

By understanding and applying the concept of parallel inductance, you can make informed design decisions and troubleshoot issues in various electrical and electronic systems.


In this tutorial, you have learned how to calculate the equivalent parallel inductance of multiple inductors. Remember the formula:

1 / Lp = 1 / L1 + 1 / L2 + 1 / L3 + ... + 1 / Ln

By applying this formula, you can determine the combined inductance when inductors are connected in parallel. Understanding parallel inductance is essential in various fields, including audio systems, power supplies, and signal processing circuits.

Now, armed with this knowledge, you can confidently calculate and utilize the equivalent parallel inductance in your engineering projects.