What is wire self-inductance?
Wire self-inductance is the inductance of a single conductor in free space. It represents the ability of the wire to oppose changes in current flow due to its magnetic field. See also our Inductor Impedance Calculator.
How accurate is this self-inductance calculation?
This calculator uses the standard formula for straight wire self-inductance in free space. It's accurate for wires that are much longer than their diameter and assumes no return path.
What's the difference between self-inductance and loop inductance?
Self-inductance is the inductance of a single wire, while loop inductance includes the self-inductance of both conductors plus their mutual inductance. Loop inductance is what's typically measured in practical circuits.
Why is the result given in nanohenries (nH)?
Wire self-inductance values are typically very small, measured in nanohenries for practical wire dimensions. This makes nH the most convenient unit for displaying results.
Does wire material affect self-inductance?
For most common conductors like copper, aluminum, or silver, the material has minimal effect on self-inductance. The geometry (diameter and length) is the dominant factor.
What are the limitations of this calculation?
This calculation assumes a straight wire in free space with uniform diameter. It doesn't account for nearby conductors, ground planes, or frequency-dependent effects.
When would I use wire self-inductance calculations?
Self-inductance calculations are used in RF circuit design, transmission line analysis, and electromagnetic simulation where the inductance of individual conductors is needed. You might also find our calculate Solenoid Inductance Inductance useful.