Skin Depth Calculator
Estimate how deeply AC current penetrates a conductor as frequency rises.
Skin Depth Calculator
Enter the known values and run the calculation.
Overview
Estimate how deeply AC current penetrates a conductor as frequency rises.
Use this tool to estimate how deeply AC current penetrates a conductor at a given frequency for the selected material properties.
Use it for cable, bus bar, shielding, RF interconnect, and plated-conductor work where rising frequency reduces the effective conduction area.
The math and how it's used
Skin depth is calculated as delta = sqrt(2 / (omega mu sigma)).
The tool uses mu = mu0 * relative permeability and the conductivity selected from the preset or entered manually.
Skin depth is the first number RF and power engineers reach for when deciding how much of a conductor is really carrying current at a given frequency.
That makes it useful for plating thickness, conductor-loss intuition, and material comparisons, but the actual current distribution still depends on geometry, proximity effect, and surface condition.
Assumptions
The material presets are broad engineering values, not certified material certificates. Plating, alloy, temperature, and mechanical processing can shift the real result.
For ferromagnetic materials, permeability can vary sharply with frequency and field strength, so manual entry is usually the better choice.