Coax Loss Calculator

Discover the most interactive Coax Loss Calculator on the web, designed by Ray Higgins W2RE for ham radio enthusiasts. Originally created for his own use, this powerful tool is now available to the public, allowing operators to optimize their stations using accurate, real-world coax loss factors. With support for all popular coax types, selectable lengths, and frequencies, this calculator provides instant dB loss, power output, and percentage loss, along with interactive charts that highlight your frequency range. Whether you’re planning an HF, VHF, or UHF station, this tool helps you maximize signal strength, minimize wasted power, and improve overall RF performance.

Coax Loss Calculator

Enter length, frequency, transmitter power, and SWR to see coax loss. Highlighted frequency shows on the graph. Hover over the graph to see frequency-specific loss.

Select Coax Types (Most Loss → Least Loss)
Select All RG-58 LMR-240 RG-213 Belden-9913 LMR-400 LMR-600 Heliax-1/2" Heliax-7/8" Heliax-1 5/8"

Length (ft)

Frequency (MHz)

Transmitter Power (W)

SWR (1.0–5.0)

SWR: 1.00

Warning: SWR above 2.0 may be unacceptable!

Power Loss Output

HF (1.8–52 MHz) VHF/UHF (52–440 MHz) Commercial (>440 MHz)