Mutual Inductance Calculator


In the realm of electrical engineering, mutual inductance plays a crucial role in understanding the behavior of electrical circuits, particularly in situations where magnetic fields influence each other. Calculating mutual inductance is essential for designing transformers, motors, and various other electromagnetic devices.

How to Use

This calculator simplifies the process of computing mutual inductance between two coils. Input the number of turns in each coil, the area of cross-section, and the relative permeability of the medium. Click the “Calculate” button, and the result will be displayed.


The formula for calculating mutual inductance (M) is:


  • μ is the permeability of the medium,
  • N1​ and N2​ are the number of turns in each coil,
  • A is the area of cross-section, and
  • l is the length of the coil.

Example Solve

Let’s consider two coils with 200 and 300 turns respectively, an area of cross-section of 0.01 m20.01m2, a relative permeability of 800, and a coil length of 0.1 meters.

Thus, the mutual inductance between the two coils is approximately 0.0757 henries.


Q: What is mutual inductance?
A: Mutual inductance is a measure of the magnetic coupling between two coils and indicates how much voltage will be induced in one coil when the current in the other coil changes.

Q: Why is mutual inductance important?
A: Mutual inductance is crucial in understanding the behavior of transformers, motors, and other electromagnetic devices. It helps in designing efficient and reliable electrical systems.

Q: Can mutual inductance be negative?
A: No, mutual inductance is always positive, as it represents the interaction between magnetic fields, which is inherently non-negative.


Calculating mutual inductance is fundamental in electrical engineering for predicting the behavior of electromagnetic systems. This calculator provides a convenient tool for engineers and students to compute mutual inductance quickly and accurately.

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