Propagation Delay Calculator

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One-way distance the signal travels from source to destination.
The cable or channel the signal travels through. Each material has a characteristic velocity factor.
Switch between calculating delay from distance, or distance from a known delay target.
Propagation delayShort
15.162ns

One-way signal travel time in nanoseconds

Delay (auto-scaled)15.162 ns
Velocity factor0.66
Signal speed197,863,022m/s
Delay per metre5,054ps/m
Speed (% of c)66%
15.162 ns
Very short<10Short10-1000Moderate1000-100000Long100000+

One-way propagation delay: 15.162 ns

  • The signal travels at 66.0% of the speed of light (velocity factor 0.660).
  • For this medium, every metre of path adds 5054.0 ps of delay.
  • Delays in this range are common for cable runs within a rack or between nearby equipment.

Next stepFor differential pairs and bus routing, match trace lengths to within a fraction of the bit period to keep skew below the setup/hold margin.

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