Offline Tool
SWR Calculator
Forward and reflected power to SWR — know when to stop tuning.
Calculate SWR from forward and reflected power readings. Works offline after your first visit.
Forward and reflected power to SWR — know when to stop tuning.
1:1 is ideal; under 1.5:1 is fine for most HF/VHF work. Above 2:1 warrants investigation before high-power operation.
Use a directional wattmeter or built-in radio SWR meter with forward and reflected power readings.
KI4TQN is a ham radio, GMRS, and emergency communications hub from East Tennessee — free tools, local reference data, YouTube-aligned guides, and consulting for property owners. Use this map to find your lane.
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