Calculate mismatch loss (extra insertion loss due to impedance mismatch) from VSWR, return loss, or reflection coefficient. Includes full conversion table and system impact.
Interactive Mismatch Loss Calculator
Mismatch Loss from Impedance Mismatch
VSWR
—
Return Loss
—
|Γ|
—
Mismatch Loss
—
Power Delivered (%)
—
Power Reflected (%)
—
Mismatch Loss Formula
ML (dB) = −10·log₁₀(1 − |Γ|²)
Power delivered to load = P_avail · (1 − |Γ|²)
Power reflected = P_avail · |Γ|²
ML = power not delivered = insertion loss due to mismatch alone
Quick Reference
VSWR
|Γ|
Mismatch Loss
Impact
1.0:1
0.000
0.00 dB
Perfect match
1.5:1
0.200
0.18 dB
Acceptable for most systems
2.0:1
0.333
0.51 dB
Moderate: needs matching
3.0:1
0.500
1.25 dB
Significant system impact
5.0:1
0.667
2.55 dB
Severe: design problem
RF View: Mismatch loss is computed automatically in the Utilities VSWR calculator. Design matching networks in RF View to reduce VSWR and mismatch loss. Free on Android.