Coil Inductance Calculator

To calculate the inductance of a single-layer, air-core coil:
1. Select the measurement units (inches or centimeters).
2. Enter the number of turns (windings).
3. Enter the coil diameter (form diameter + wire diameter - see diagram).
4. Enter the coil length (distance from first to last winding - see diagram).
5. Click Calculate.

Inches
Centimeters

Single-layer coil
Multi-layer, multi-row coil
Multi-layer, single-row coil

(The following inductance formula requires units in inches.)

Turns
Enter the number of turns.

Diameter
Enter the coil diameter.

Length
Enter the coil length.

Depth
Enter the coil depth.




Result:

Reference: The ARRL Handbook for Radio Communications 2017
See also: Toroid coil winding calculator

French version