Tools/Return Loss Calculator

Return Loss Calculator

Calculate return loss, VSWR, and reflection coefficient

Input Parameters

Calculate From

Z₀

50Ω

96%

Z_L

75Ω

Characteristic Impedance Z₀ (Ω)

Load Impedance Z_L (Ω)

marginal Match

Marginal match. Consider impedance matching.

Return Loss

13.98 dB

VSWR

1.50:1

|Γ|

0.200

Mismatch Loss

0.177 dB

Power Transmitted

96.0%

Power Reflected

4.0%

Return Loss = -20×log₁₀(|Γ|). Higher is better. Target ≥15dB for good match.

≥20 dBExcellent

15-20 dBGood

10-15 dBMarginal

<10 dBPoor

Γ = (Z_L - Z₀) / (Z_L + Z₀)

RL = -20 × log₁₀(|Γ|)

VSWR = (1 + |Γ|) / (1 - |Γ|)

We specialize in controlled impedance and RF boards.