PCB Trace Width Calculator
Calculate optimal trace width according to IPC-2221 standards
PCB Trace Width Calculator
Use IPC-2221 based estimation to size copper trace width and review the electrical impact on resistance, voltage drop, and power loss.
IPC-2221 Compliant
When to use this calculator
Use it during routing to estimate whether your copper width is in the right range before stackup and DFM review.
Review resistance, voltage drop, and power loss when you need to understand electrical impact beyond width only.
Use the result as a conversation starter with fabrication or assembly engineers when planning copper weight and routing strategy.
Key Features
IPC-2221 Compliant
Calculations based on industry standard IPC-2221 formulas for reliability.
Internal & External
Support for both internal and external layer calculations with different thermal properties.
Comprehensive Results
Get width, resistance, voltage drop, and power loss in one calculation.
Related resources & next steps
Check how much current a given trace can safely carry after you estimate width.
Review controlled impedance requirements when routing high-speed or RF traces.
Move from rough estimation to manufacturable copper, stackup, and tolerance planning.
Send your files to discuss DFM, copper weight, trace width, and fabrication constraints with engineering.
Frequently Asked Questions
What is the IPC-2221 standard?
IPC-2221 is the Generic Standard on Printed Board Design. It provides the formulas used to calculate the relationship between copper trace current carrying capacity, temperature rise, and trace geometry.
Why is trace width important?
Proper trace width ensures the PCB can handle the required current without overheating, which could lead to board failure or damage.
Can I use this calculator as the final manufacturing value?
Use it as an engineering estimate, not a final fabrication rule. Finished copper thickness, etching tolerance, stackup details, and thermal environment can change the real requirement, so final values should be reviewed with your PCB manufacturer.
Need help turning this estimate into a manufacturable PCB?
If you are balancing copper weight, current capacity, voltage drop, and DFM constraints, our team can review your stackup, routing assumptions, and fabrication targets before production.