SWR Calculator

SWR = (1 + |Γ|) / (1 − |Γ|) where Γ is the reflection coefficient. From forward/reflected power: |Γ| = √(Pr / Pf). Return loss (dB) = −20 log₁₀|Γ|. Mismatch loss (dB) = −10 log₁₀(1 − |Γ|²). SWR below 1.5 is excellent, 1.5–2.0 is acceptable, above 3 usually needs attention.

1. Choose an input mode: forward/reflected power, or load and line impedance.
2. Enter the values and read the computed SWR, reflection coefficient, return loss, and mismatch loss.
3. Watch the color indicator: green (≤1.5), yellow (1.5–2), orange (2–3), red (>3).