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Surface Current Density Converter

Convert surface current density: A/m², A/cm².

3 units
6 decimals

1 A/m² = 0.0001 Ampere/cm²

About the surface current density converter

Surface current density is the current per unit cross-sectional area, measured in amperes per square meter (A/m²). It is the quantity engineers cap to keep wires and PCB traces from overheating, and it determines current crowding and skin-effect losses in high-frequency conductors.

Frequently asked questions

  • What current density is safe for copper PCB traces?

    Internal traces are usually limited to ~20 A/mm² (2 × 10⁷ A/m²) for a 10 °C rise; external traces can take a bit more. The IPC-2221 chart gives full guidance.

  • Why does current density matter at high frequency?

    At high frequency, current concentrates near the conductor surface (skin effect), so the effective area shrinks and density rises sharply, increasing resistive losses.

More electricity converters

Charge → Linear Charge Density → Surface Charge Density → Volume Charge Density → Current → Linear Current Density → Electric Field Strength → Electric Potential →

Complete list of surface current density units