SWR / Return Loss / Γ Converter
Convert any reflection metric to all the others — SWR, return loss dB, |Γ|, reflected power percent and mismatch loss.
SWR 1.5 reflects only 4 % of power (0.18 dB loss) — chasing 1.0 rarely buys range; transmitters usually fold back protection above SWR ~3. Note the meter location matters: lossy coax makes SWR look BETTER at the radio than at the antenna, because the reflection gets attenuated twice.
SWR Return Loss Converter computes SWR, return loss, |Γ|, reflected power and mismatch loss — any one to all the others — free, instant and private in your browser. Ham operators with SWR meters and engineers reading VNA S11 plots use it to skip the datasheet algebra: type your numbers, read the answer with the substituted formula shown step by step, and share an exact permalink of the calculation.
About SWR / Return Loss / Γ Converter
SWR Return Loss Converter computes SWR, return loss, |Γ|, reflected power and mismatch loss — any one to all the others using the standard engineering relation: |Γ| = (SWR−1)/(SWR+1); RL = −20log|Γ|; reflected % = |Γ|²; ML = −10log(1−|Γ|²). Worked live: SWR 1.5 = 14 dB return loss = only 4 % power reflected = 0.18 dB of real loss. The result recalculates on every keystroke, the worked-example panel shows your numbers substituted into the formula, and the Copy permalink button encodes the inputs in the URL so a colleague opens exactly your calculation. Everything runs client-side — nothing you type leaves your device.
How to use SWR / Return Loss / Γ Converter
- 1Enter your values — the tool starts with realistic defaults for this exact use case, so the worked example is meaningful immediately.
- 2Read the live result and the worked-example panel, which substitutes your numbers into the formula step by step.
- 3Adjust any input to compare scenarios, then use Copy result or Copy permalink to share the calculation.
Why use SWR / Return Loss / Γ Converter?
- ✓Implements the real formula — |Γ| = (SWR−1)/(SWR+1) — with the substitution shown, not a black box
- ✓Built for ham operators with SWR meters and engineers reading VNA S11 plots
- ✓Copy result and permalink buttons — share the exact calculation in a README, forum answer or design review
- ✓100% free, no sign-up, runs entirely in your browser (works offline once loaded)
Frequently asked questions
How do you calculate swr return loss?+
SWR, return loss, |Γ|, reflected power and mismatch loss — any one to all the others follows |Γ| = (SWR−1)/(SWR+1); RL = −20log|Γ|; reflected % = |Γ|²; ML = −10log(1−|Γ|²). For example, SWR 1.5 = 14 dB return loss = only 4 % power reflected = 0.18 dB of real loss. The calculator applies the same relation and shows the substituted arithmetic so you can verify every step.
Is SWR 1.5 bad? Should I chase 1.0?+
SWR 1.5 wastes 4 % of power — 0.18 dB, inaudible and invisible at the far end. Transmitter protection typically engages near SWR 3. Chasing below ~1.5 buys almost nothing; antenna placement and height matter vastly more.
Why does my SWR look better at the radio than at the antenna?+
Feedline loss attenuates the reflection twice (out and back), flattering the reading. A 3 dB-loss cable makes an open circuit read like SWR 3 at the radio. Measure at the antenna, or correct for cable loss, before celebrating.
Is the SWR Return Loss Converter free and private?+
Yes — completely free with no sign-up or usage limits, and it runs entirely in your browser: the values you enter are never uploaded or stored on a server.
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