The calculator below is for designing a Multilayer Air Core Inductor using Enabeled wire. Using the input data on the left, the calculator uses a itterative process to calculate the Number of Turns per Layer, Number of Layers, Total Number of Turns, and then the overall Diameter (D).

Enameled wire adds about 0.005 inches (0.127 mm) to the wire size. However, the actual thickness of the enamel depends on the wire size and class of enamel. Wires with smaller diameters usually get thinner enamel coatings than larger diameter wires. Plus many manufactures rate the thickness by "Class". Higher "Class" coating numbers are generally thicker. If you are trying to determine the gauge of a enameled wire, it might be best to remove the enamel from a small section before measuring.

The Required Inductance can be specified in H, mH, or uH. The Spool Inner Diameter (d) and Spool Length (𝓁) can be specified in inches, mm, or cm. The Wire Size (diameter)can be specified in AWG, inches, or mm. Just enter the required data and click anywhere outside the data area.