Via Current & Properties Calculator

Estimate plated via current capacity, resistance, voltage drop, inductance, capacitance, and aspect ratio.

Estimated current–

Resistance–

Voltage drop / power–

Parasitics (L / C)–

Aspect ratio–

About via current estimates

A_barrel ≈ π × finished diameter × plating thickness

The plated barrel is treated as a conductor and rated with the same IPC-2221 estimate used for traces. Switch the mode to find the current a via can carry, or the diameter needed for a target load current. Resistance, drop, parasitic inductance/capacitance, and aspect ratio follow from the geometry.

Via ratings depend strongly on plating quality, copper planes, and thermal spreading — confirm against your fabricator's capabilities.