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Transmission Line Reflection Calculator

Calculate transmission line reflection with explicit inputs, units and model limitations.

Use this browser-based tool for an initial engineering estimate. Inputs remain in this page and are not sent to a server.

Enter your values, then calculate.

Method and units

The load reflection coefficient is ΓL = (ZL − Z₀)/(ZL + Z₀). The launched step is V × Z₀/(ZS + Z₀), and the first load step is the launched step × (1 + ΓL).

Model limits

Assumes a lossless line and purely resistive source and load. It reports the first arrival, not a full time-domain simulation or the final settled waveform.

Use the result in your project

Record the assumptions with the result. Check actual material and component data, evaluate tolerances and confirm the proposed construction before releasing manufacturing files.