Toroid Coil Winding Calculator

              

Use this online tool to calculate the number of winding turns required to achieve the desired inductance with ferrite and iron powder toroidal cores.

To use the calculator:
First, select the core material type.
     Select Iron Powder for cores with a 'T' prefix (such as the T-50-2).
     Select Ferrite for cores with an 'FT' prefix (such as the FT-43-63).

Material Type:
Iron Powder Ferrite

Inductance
      

Core Size


Material Number


       Calculate
        



 


 



 

For more information about using this calculator, see Using the Toroid Winding Calculator.

For a brief description of toroid core terms used on this page (such as A_L and u), see Toroid Coil Terminology.

Two great references on toroidal inductors and transformers:
The ARRL Handbook for Radio Communications 2017

Transmission Line Transformers, 4th Edition, by Jerry Sevick