Air core coils with inductors do not require ferromagnetic materials to achieve the desired inductance. This air core inductor calculator can be utilised when constructing antenna matching units, crystal sets, antenna traps, or wherever a single-layer air-cored inductor is needed.

Air Core Inductor Calculator allows determining the inductance of a coil of air core inductor.

To obtain the desired output, enter the diameter of the coil, its length, and the number of turns.

**Formula:**

**L = (N2 x d2) / (18d + 40l)**

where:

L represents the inductance in micro Henrys(Î¼H).

d represents the diameter of the coil in inches.

l represents coil length in inches.

n represents the number of turns.

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