PCB Trace Width Calculator

IPC-2221 | External & Internal Copper Layers

Standard

IPC-2221

Layers

Ext / Int

Copper

0.5–3 oz

Input Parameters

Current (A) Maximum continuous current through trace

Temperature Rise (°C) Allowed temp rise above ambient

°C

IPC-2221 recommends 10°C for most designs. Use 20-30°C only for non-critical traces.

Layer Type

External

Top / Bottom layer

Internal

Inner PCB layers

Copper Weight Standard PCB copper thickness

Trace Length optional Enables resistance and voltage drop calculation

📋 Copper Weight Reference

oz/ft²	Thickness (μm)	Thickness (mils)	Use Case
0.5 oz	17.5 μm	0.7 mils	Fine pitch / HDI
1 oz	35 μm	1.4 mils	Standard (most common)
2 oz	70 μm	2.8 mils	Power electronics
3 oz	105 μm	4.2 mils	High current boards

Results