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Inductance Calculator

Inductance Calculator
Air Core Inductor Coil Inductance Calculator
The following is a design tool which calculates the inductance of an air core inductor. 
L= (d^2 * n^2)/(18d+40l)
where:
L is inductance in micro Henrys,
d is coil diameter in inches,
l  is coil length in inches, and
n is number of turns.

d (coil diameter in inches) (inches)
l (coil length in inches) (inches)
n (number of turns)  
L (Inductance) (uH)




 


Reader Interactions

Comments

  1. DJMota says

    January 16, 2022

    Great tool, but it could be with metric units for non-English people.
    Having to change between units is annoying.
    Greetings.

    Reply
    • Бойчо says

      August 14, 2022

      1 inch = 25,4 mm

      Reply
  2. marcelino ibrahim says

    February 4, 2020

    hi sir thx for sharing your knowledge I have a question about the inductance calculator it has the coil diameter and length and number of turns so if I use whatever wire gauge it will give the same result?
    and another question I have if u can answer it is that lets say we have a 1micro Henry made of air core and another 1 micro Henry made of ferrite core they will perform the same as long as the value is one micro Henry?

    Reply
    • Swagatam says

      February 4, 2020

      Thanks Marcelino, the wire thickness will decide the amount of current the coil can handle. If the current is minimal then any minimum wire gauge can be used and all will give the same results. I don’t think an air core and a ferrite core inductor will produce the same results, because magnetic characteristics will be different for air and ferrite.

      Reply
  3. Chandra Shekhar Gupta says

    November 27, 2019

    Dear friend,
    As you provided the calculator for a given coil to calculate the inductance. I wish for a calculator to workout
    a new given inductance.

    Reply
    • Swagatam says

      November 27, 2019

      Dear Chandra, please check the software, I have updated it appropriately…

      Reply
  4. Tapiwa Akin says

    September 17, 2019

    hi . how do i get in touch with you via email. I need help on a school project that includes electromagnetism

    Reply
    • Swagatam says

      September 18, 2019

      Tapiwa, you can explain it here through comments, if possible I’ll try to help….

      Reply
      • Tapiwa says

        September 18, 2019

        My project involves controlling the closure of a car door to prevent it from slamming using electromagnet.if it’s moving too fast it can be repelled for a second and after the delay it gets attracted .so how can I make the magnet change polarity for jus a moment to repel an object and then attract it again.if you can help with a circuit or a similar one and things you think I might need.im sort of stuck

        Reply
        • Swagatam says

          September 19, 2019

          The polarity of electromagnet can be changed with a DPDT relay. Trigger the relay with a reed switch as soon as the door is about to slam so that the DPDT relay triggers and reverses the electromagnet polarity.

          Reply
          • Tapiwa says

            September 19, 2019

            so is a h bridge dual motor driver necessary and do you happen to have a circuit that may be similar and involves a reed switch and DPDT relay

            Reply
            • Swagatam says

              September 19, 2019

              only a DPDT relay and a reed switch or a micro switch is all that’s required for changing the electromagnet polarity..if possible I’ll try to draw it for you.

              Reply
  5. Rabin Tarafdar says

    April 27, 2019

    Most of your articles easy to follow. One problem we often face is where to get spares particularly IC in kolkata
    market. where to get charts of relative permeability.
    Thanks a lot.
    Rabin Tarafdar

    Reply
    • Swagatam says

      April 28, 2019

      Thank you Rabin, I am based in Mumbai so I don’t know much regarding the parts availability in Kolkata…I would rather recommend buying from an online shop, from where you can buy any desired part as per your requirement.

      Some information regarding relative permeability can be learned from this online post:

      https://en.wikipedia.org/wiki/Permeability_(electromagnetism)

      Reply

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