KiCad "Annular width" DRC error: annular ring too small
KiCad design rule check (PCB) message: Annular width (annular_width in kicad-cli reports).
What it means
The annular ring is the copper left around a hole: (pad diameter − drill) ÷ 2. KiCad reports "Annular width" when that ring is smaller than the minimum. Too thin a ring can break out when the drill wanders. Increase the pad or via diameter, or use a smaller drill.
Common causes
- Vias with a large drill in a small pad (for example 0.4 mm drill in a 0.6 mm pad leaves 0.1 mm).
- Footprints drawn with tight pads for small pins.
How to fix it
- Change the via size in Board Setup → Pre-defined Sizes, then use Edit → Edit Track & Via Properties to update existing vias.
- Edit the footprint pads, or pick a footprint variant with larger pads.
Where the setting lives
Board Setup → Design Rules → Constraints → Minimum annular width.
What fabs need
JLCPCB lists 0.15–0.18 mm as an absolute minimum annular ring for plated holes depending on layer count; PCBWay lists 0.15 mm.
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Checked against KiCad 10's source and documentation. Last reviewed 2026-11-07.
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