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Interactive PCB Tool
Via Aspect Ratio Checker
Aspect ratio = finished board thickness ÷ smallest plated through-hole diameter. It tells you how hard your holes are to drill and reliably plate. Ultra-high-layer 32–42 boards are thick, so they tend to push this ratio high.
Total finished stack-up thickness.
mm
Finished drill diameter of the smallest plated through-hole.
mm
Enter a positive thickness and a positive diameter (both in mm).
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≤8:1
Standard 8–12:1
Advanced 12–15:1
High-cap >15:1
Specialist
Standard 8–12:1
Advanced 12–15:1
High-cap >15:1
Specialist
Why this matters for 32–42 layer boards
Ultra-high-layer 32–42 boards are physically thick, so the same drill diameter yields a much higher aspect ratio. Reliable plating at high ratios typically relies on sequential lamination with laser-drilled microvias and/or back-drilling. Above ~15:1, treat it as a conversation to have with an engineer, not a checkbox.
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Send us your stack-up and drill table for a manufacturability check.
