Calculate OAR size to vias in Kicad


How can I calculate the OAR for some vias of classification C?

To NPTH holes in mm.

I have this error in PCB Visualizer.

The measured value for Outer layer annular ring (OAR) (0.000 mm) does not match any of the available options.

I’m currently using 0.6mm (Via dia) and 0.35mm (Via drill).

Best regards

Sorry, I already understood it. Outer Annular Ring

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