PCB Trace Length Calculator

Calculate PCB trace length based on signal timing requirements. This tool helps ensure signal integrity in high-speed PCB design.

Common FR4 value: 4.2

Results

Maximum Trace Length Difference: -
Signal Wavelength: -

Design Guidelines

Length Matching Rules

  • High-speed signals: Match within ±5% of wavelength
  • Critical timing: Match within ±2% of wavelength
  • Clock lines: Match within ±1% of wavelength

Common Dielectric Constants

  • FR4: 4.0 - 4.5
  • Rogers RO4350B: 3.48
  • Polyimide: 3.2 - 3.5
  • PTFE: 2.1 - 2.5

Important Notes

  • Results are theoretical calculations; actual measurements may vary
  • Consider manufacturing tolerances in your design
  • For critical applications, verify with signal integrity analysis
  • Account for via transitions in total length calculations