How to use the skin depth calculator
Find how deep AC current penetrates a conductor. Enter frequency, resistivity, relative permeability in the fields above; the skin depth is computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- f — Frequency (kHz)
- rho — Resistivity (Ω·m)
- ur — Relative permeability
Worked example
With frequency = 100 kHz, resistivity = Copper, relative permeability = 1, the calculator gives skin depth ≈ 0.2062884 mm.
Frequently asked questions
What is the formula for the skin depth calculation?
Skin depth (mm) = √(rho / (π × f × 1000 × ur × MU0)) × 1000. Here f is frequency (kHz), rho is resistivity (Ω·m), ur is relative permeability.
What inputs do I need for the skin depth calculator?
You need frequency in kHz, resistivity in Ω·m, relative permeability. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.