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On-line spool or coil inductance. Calculate the inductance and length of wire required to obtain given dimensions inductance.

Enter the diameter and length in mm for the single layer coil and the calculator will calculate the inductance given in Henry (H).

**D** Diameter of the coil in mm

**L** Length of coil in millimeters

**N** Number of turns

This calculator was created for use with the short whip antenna calculator to obtain a resonant antenna matching circuit for the RF transmitter PA section, but can also be used to make antenna traps, resonant circuits, low pass filters, etc.

*Calculations are based using PI (π) = 3.141592653589.*

Calculated results

**? H**

**? mH**

**? µH**

**? nH**

**Length of wire needed: ? mm** (add some extra length for mounting or soldering tags.)