VSWR & Return Loss Calculator

VSWR (Voltage Standing Wave Ratio) measures impedance mismatch on transmission lines. Perfect match gives VSWR=1. Convert between VSWR, Γ, return loss, and mismatch loss.

Formulas

Γ = (VSWR−1) / (VSWR+1)

RL = −20 × log₁₀(Γ) [dB]

ML = −10 × log₁₀(1−Γ²) [dB]

VSWR Quality Reference

VSWR	RL (dB)	Reflected	Quality
1.0	∞	0%	Perfect
1.2	20.8	0.8%	Excellent
1.5	14.0	4%	Good
2.0	9.5	11%	Acceptable
3.0	6.0	25%	Poor

VSWR & Return Loss Calculator

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