66pacific.com  Coil Inductance Calculator
Turns
  		Diameter
  		Length
  		Depth
  		Units:

 Calculate



     Toroid-winding calculator
The inductance formula above requires units in inches.
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.

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