tosmithchart.com Smith Chart · VSWR · RF Calculators

How to use this tool

This calculator helps RF engineers quickly convert between common mismatch metrics such as VSWR, Return Loss (dB), and reflection coefficient |Γ|.

Typical use cases

Notes

Results assume ideal conditions. Always confirm with calibrated measurements.

VSWR / Return Loss / |Γ| Calculator

Convert between VSWR, Return Loss (dB), and the magnitude of reflection coefficient |Γ|. This is a quick helper tool for RF/microwave work and VNA result interpretation.

VSWR—
Return Loss (dB)—
|Γ|—

Formulas

  • VSWR = (1 + |Γ|) / (1 − |Γ|)
  • Return Loss (dB) = −20 · log10(|Γ|)
  • So, |Γ| = (VSWR − 1) / (VSWR + 1)

Notes: VSWR ≥ 1 and 0 ≤ |Γ| < 1. If |Γ| approaches 1, VSWR diverges.

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Why this matters

Return loss and VSWR are two common ways to quantify impedance mismatch. Engineers often move between them while reviewing VNA measurements, matching networks, and antenna performance.

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