Ferrite toroid calculator - 3.9 out of 5 based on 35 votes
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Online calculators

Here you can see the formulas that the calculator uses to calculate the inductance. The online calculator uses the wire diameter to determine its length and the possibility of fitting it in the inner diameter of the toroid. The outer diameter of the wire (with insulation) should be using in this calculator. You can download the cross-platform app Coil64 to calculate ferrite toroid inductance coil offline.

Ferrite toroid calculation:

On-line ferrite ring core inductor calculator
ferrite toroid calculator
Select units:   AWG →   SWG → 

L – Required inductance
D1   – Outer diameter of ring
D2   – Inner diameter of ring
h   – Height of ring
µ – Relative magnetic permeability
d   – Diameter of wire    

N – Number of turns
Lw   – Required length of wire
Clear all

*Necessary for winding wire length with a reserve 10cm on the leads.

The calculator allows calculating only low-current coils, not a power supply chokes, see more...

You can determine the unknown permeability of the toroid core by the following calculator.

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