SWR & Return Loss
Type any one — the rest fill in. Or use forward/reflected power from your meter.
KENTUCKY PORTABLE CLUB • TOOLS
HAM CALCULATORS
The everyday math in one place — SWR, decibels, Ohm's law, wavelengths, transformer turns, resonance, and distance & beam heading between grid squares.
Decibels & Power
Watts ↔ dBm ↔ dBW, and how many dB between two powers. What would they hear? →
Ohm's Law & Power
Fill in any two — volts, amps, ohms or watts.
Wavelength & Antenna Lengths
Free-space wavelength, plus common wire lengths and coax stubs.
Transformer Turns (Ununs & Baluns)
Turns ratio is the square root of the impedance ratio — handy for winding an EFHW unun or a receive transformer. Other ratios · Full build guide →
LC Resonance
Fill in any two of frequency, inductance and capacitance — for traps, loading coils and tuned circuits. Building a mag loop? Use the magnetic loop calculator.
Grid Square Distance & Beam Heading
Distance and the direction to point your beam between two Maidenhead grids (4 or 6 characters). Tap "My grid" to use your phone's location.
More: Antenna Calculator & coax loss · Battery runtime · RF exposure check · Radials
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KENTUCKY PORTABLE CLUB • EST. 2026
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