Via Pad & Anti-pad Calculator | IPC-7251 Compatible

📏 Unit System

Metric (mm) Imperial (mil)

🔧 Input Method

Finished Hole Size Component Lead Diameter

Final plated through-hole diameter (after plating).

Overrides above if provided (useful for vias).

📐 Pad Sizing Standard

IPC Class Custom Annular Ring

IPC-7251 annular ring for outer layers.

🛡️ Anti-pad Clearance (for internal planes)

Gap around hole Multiplier (× hole) Absolute diameter

Anti-pad diameter = hole + 2×gap. Typical: 0.2-0.5mm.

📖 Design Reference: Pad diameters follow IPC-7251. Anti-pad clearance suggestions based on common practice (IPC-2221). Always validate with your PCB manufacturer's design rules.

📧 If you have any questions about PCBs, please email us at sales@pcbsky.com, and we will answer them for free.

🔩 Via Pad & Anti-pad Calculator