Inductor colour code calculator
Inductor colour code calculator — read the inductance from the coloured bands (color code), including the military standard. Pick the colours, get the value.
Inductive reactance calculator
Inductive reactance calculator — X = 2πfL for any coil at any frequency, with careful conversion between nH, µH, mH, kHz and MHz.
Conical Tesla coil calculator
Conical Tesla coil calculator — inductance computed numerically by Maxwell’s method instead of Wheeler’s approximations, accurate where those formulas drift.
Wire-above-plane inductance calculator
Wire above a ground plane — inductance and characteristic impedance of a length of line at UHF, for printed and wire-built RF circuits.