Single-layer inductor calculator
Single-layer coil calculator — turns for the inductance you need and the inductance of a given coil, from Lundin’s formula with Rosa’s corrections.
Multilayer inductor calculator
Multilayer coil calculator — turns, layers, wire length and resistance for a multilayer inductor, computed by Maxwell’s method.
Rectangular-former multilayer coil calculator
Multilayer coil on a rectangular former — turns and layers from Grover’s formulas for straight segments.
PCB coil calculator
PCB spiral inductor calculator — number of turns, pitch and track width for a printed spiral coil, with a drawing of the spiral.
Flat spiral Tesla coil calculator
Flat spiral (pancake) coil calculator — turns, outer diameter and wire length, with inductance by Maxwell’s method. For Tesla coils and flat inductors.
Rectangular loop inductance calculator
Rectangular loop inductance calculator — a single-turn rectangle of round wire from Grover’s formula, for loop antennas and tuned circuits.
Triangular loop inductance calculator
Triangular loop inductance calculator — the inductance of an isosceles single-turn loop of round wire, for loop antennas and tuned circuits, with formulas.
Foil-wound coil calculator
Foil-wound coil calculator — turns, diameter and foil length for a coil wound from strip or tape, using the geometric mean distance, with formulas and a drawing.
LC resonance calculator
LC resonance calculator — resonant frequency from L and C, or the L or C you need for a target frequency, plus characteristic impedance, from f = 1/2π√LC.