PCB Trace Width & Current Capacity Calculator (IPC-2221)
PCB layout design and power electronics tool. Computes trace width in mils and mm based on Amps current, copper weight (1 oz/2 oz), and allowed temp rise.
Input Parameters
Instant Calculation Result
Adjust values on the left to calculate live results.
In-Depth Guide & Mathematical Methodology
📐 IPC-2221 Copper Weight Standards
1 oz/ft² Copper: 1.37 mils (35 μm) thickness - Most common standard PCB copper.
2 oz/ft² Copper: 2.74 mils (70 μm) thickness - Heavy power trace copper.
Frequently Asked Questions (FAQ)
What is the PCB Trace Width & Current Capacity Calculator (IPC-2221) and how does it work?
PCB layout design and power electronics tool. Computes trace width in mils and mm based on Amps current, copper weight (1 oz/2 oz), and allowed temp rise.
How do I use this PCB Trace Width & Current Capacity Calculator (IPC-2221)?
Enter Maximum Continuous Trace Current ($I$ in Amps - A). Select Copper Thickness Weight (1 oz/ft² = 35 $\mu$m or 2 oz/ft² = 70 $\mu$m). Enter Allowed Temperature Rise ($\Delta T$ in °C, e.g. 10°C). View Calculated Minimum Trace Width in mils (thou) and millimeters (mm).
What mathematical formula is used in this calculation?
IPC-2221 External Layer: Area (mils²) = (I / (0.048 * ΔT^0.44))^(1 / 0.725). Width (mils) = Area / (ThicknessOz * 1.378).
Is the PCB Trace Width & Current Capacity Calculator (IPC-2221) on FindCalculator free to use?
Yes, all 330+ interactive tools on FindCalculator.online are 100% free, run directly in your browser without registration, and do not store your private calculation data.