Enter your Wire Diameter and Wire Length (with your choice of units) into the Wire Self-Inductance Calculator to find the wire's Self Inductance, along with Inductance per Unit Length and your dimensions auto-converted to centimeters.
Self Inductance
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Inductance per Unit Length
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Diameter (cm)
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Length (cm)
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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.
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.
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.
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.
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.
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.
Self-inductance calculations are used in RF circuit design, transmission line analysis, and electromagnetic simulation where the inductance of individual conductors is needed.