Wire Self-Inductance Calculator

A straight wire carrying current generates its own magnetic field, and the Wire Self-Inductance Calculator measures how strongly that wire resists changes in current — its self-inductance in nanohenries (nH). Enter your wire diameter and wire length (in mm, cm, mils, inches, or µm) to get the total self inductance plus inductance per unit length — useful when designing PCB traces, RF circuits, or any layout where parasitic inductance matters. Also try the Inductor Impedance Calculator.

Diameter of the wire

Length of the wire

Results

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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Frequently Asked Questions

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 Solenoid Inductance 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. You might also find our Toroidal Inductor Calculator useful.

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.