🔌 PCB Trace Width Calculator

🛡️ 100% Client‑Side — Private
IPC‑2221 · IPC‑2152 · Copper Weight Tabs · Temperature Rise
A
cm
Minimum Trace Width
12.5 mil
0.32 mm Recommended: 15 mil
Trace Resistance
48.3 mΩ/in
Voltage Drop
0.038 V
Power Loss
0.76 mW
Cross‑section Area
1.23 mil²
📐 Show Calculation Steps
✓ Real‑time · IPC‑2221 & IPC‑2152 · Manufacturability tips · No server

📘 PCB Trace Width Guide

PCB trace width determines how much current a copper trace can carry without overheating. This calculator uses IPC‑2221 (classic) and IPC‑2152 (modern, more accurate) standards to compute the minimum required width based on current, copper weight, and allowable temperature rise.

❓ FAQ

What is the difference between IPC‑2221 and IPC‑2152?

IPC‑2221 is the classic industry standard. IPC‑2152 is a newer, more accurate model that better accounts for heat dissipation, especially for internal layers. For critical designs, IPC‑2152 is recommended.

What temperature rise should I use?

10°C is a safe default for general purpose. 20°C is acceptable for power traces. Higher rises allow narrower traces but increase operating temperature.

Why is the recommended width larger than the minimum?

The minimum is the absolute theoretical limit. The recommended width adds a ~20% safety margin and aligns with common PCB fabrication capabilities.

Does this calculator account for vias or planes?

No, it calculates a single isolated trace. Thermal relief from planes can allow slightly higher currents.