Air Core Inductor Calculator

Calculate the inductance of a single layer air core inductor in Microhenrys (uH).
This type of coil is used for antenna traps and loading coils.

L= (d^2 * n^2)/(18d+40l)

The diameter of the coil is measured in inches from center to center.
The length of the coil is measured in inches from end to end.
Convert fractions of an inch to decimals.

d (coil diameter in inches) (inches)
l (coil length in inches) (inches)
n (number of turns)
L (Inductance) (uH)