Enter the total inductance (H) and the total length into the Calculator. The calculator will evaluate the Inductance Per Unit Length. 

Inductance Per Unit Length Formula

IPL = I / L


  • IPL is the Inductance Per Unit Length (H/unit length)
  • I is the total inductance (H)
  • L is the total length

To calculate Inductance Per Unit Length, divide the total inductance by the total length.

How to Calculate Inductance Per Unit Length?

The following steps outline how to calculate the Inductance Per Unit Length.

  1. First, determine the total inductance (H). 
  2. Next, determine the total length. 
  3. Next, gather the formula from above = IPL = I / L.
  4. Finally, calculate the Inductance Per Unit Length.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total inductance (H) = 400

total length = 20


What is inductance and why is it important?
Inductance is a property of an electrical conductor by which a change in current in the conductor induces an electromotive force (EMF) in both the conductor itself (self-inductance) and in any nearby conductors (mutual inductance). This property is important in the design of circuits, especially in radio frequency and power transmission, where it affects how energy is stored and transferred.

How does the length of a conductor affect its inductance?
The inductance of a conductor is directly proportional to its length. The longer the conductor, the higher its inductance. This is because a longer conductor allows for more turns or loops, which increases the total magnetic flux and, consequently, the inductance.

Can the inductance per unit length be changed, and if so, how?
Yes, the inductance per unit length can be changed by altering the physical properties of the conductor or its surrounding environment. This can include changing the conductor’s material, its shape, the number of turns in a coil, or introducing a ferromagnetic core to increase the magnetic flux linkage.

Why might someone need to calculate the inductance per unit length?
Calculating the inductance per unit length is crucial in designing and analyzing electrical and electronic circuits, especially in telecommunications, power distribution, and in the design of inductors and transformers. It helps engineers ensure that circuits operate efficiently and effectively by minimizing unwanted inductive effects or by correctly harnessing inductance where needed.