VSWR Calculator
Free calculate voltage standing wave ratio (vswr) for rf circuits. vswr measures the efficiency of power transmission and impedance matching.
Input Parameters
Typically 50Ω or 75Ω
OR
Enter if known (0 to 1)
Results
Enter impedance values to calculate VSWR
VSWR Formula
VSWR Equations
VSWR = (1 + |Γ|) / (1 - |Γ|)
Γ = (ZL - Z₀) / (ZL + Z₀)
Where Γ = reflection coefficient
VSWR Values
- • 1.0: Perfect match (ideal)
- • 1.5: Good match
- • 2.0: Acceptable
- • >2.0: Poor match