Ferrite toroid calculator - 3.9 out of 5 based on 35 votes
Rating 3.94 (35 Votes)

# 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:

ENTER THE INPUT DATA:
 Select units: mm/cmmil/inch AWG → 000000000012345678910111213141516171819202122232425262728293031323334353637383940 SWG → 7/06/05/04/03/02/001234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950

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

RESULT:
 N = – Number of turns Lw – Required length of wire

*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...

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