Online calculator for determining the inductance of an air-core coil. Enter a value for the diameter of the coil, its length, and the number of turns to get the desired result.
Calculator of air rod coil inductance
Air Core Flat Spiral Inductance = ( ( (4.921)*N2(d1+d2)2 ) / (15d1-7d2) ) * dimension
- N = number of turns
- d1=outer diameter
- d2=inner diameter