Charts for Ferrite Inductor Design
Courtesy of Fair-Rite Magnetics

CORRECTED formula included

K = n^(1/n^0.43) where n = lr/lc and n 2.0 to 4.0.
NOTE that 1/n is plotted below!

LC to LR ratio Conversion

Kfactor = lr/lc^(lc/lr^0.43)

lc/lr K xxxlc/lr K
0.252.1460.381.893
0.262.1270.391.874
0.272.1080.401.855
0.282.0880.411.836
0.292.0690.421.817
0.302.0490.431.799
0.312.0290.441.780
0.322.0100.451.762
0.331.9900.461.744
0.341.9710.471.726
0.351.9510.481.708
0.361.9320.491.690
0.371.9120.501.673

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