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.

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.

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.