VSWR & Return Loss Calculator

Convert between VSWR, return loss, reflection coefficient, and mismatch loss. See reflected vs transmitted power.

VSWR

Input Power

Tab to move between fields

Return Loss

13.98 dB

Reflection Coefficient (Γ)

0.2

Power Transmitted

96 %

Mismatch Loss0.177 dB

Power Reflected4 %

Reflected Power4 W

Transmitted Power96 W

Impedance (High)75 Ω

Impedance (Low)33.3 Ω

How to Use This Calculator

Enter the measured VSWR from your antenna analyzer (ideal = 1.0:1, acceptable <2.0:1).
Set transmitter input power (W).
Review return loss (dB), reflection coefficient, mismatch loss (dB), and reflected power percentage.
VSWR above 2.0:1 reflects >11% power and may damage your transmitter -- investigate antenna connection.
Use mismatch loss to quantify efficiency reduction from antenna impedance mismatch.

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Formula

Γ = (VSWR - 1) / (VSWR + 1); RL = -20·log₁₀(Γ)

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