Toroide windings calculator  
Voltage / Current: 
Iron powder Ferrite 

Al value:  
Desired value:  
Windings: 
 This calculator calculates the number of windings on a toroide.
 Select the material of the toroide: iron powder or ferrite.
 Input: the Al value and the desired value in uH (iron powder) or mH (ferrite).
 For iron powder, the formula is: N = 100 x SQR(L[uH] / Al).
 For ferrite, the formula is: N = 1000 x SQR(L[mH] / Al).