Cable Loss Calculator

Loss by cable type

Loss uses the standard two-term coax model, loss (dB/100ft) = k1·√f_MHz + k2·f_MHz, where the first term is conductor (skin-effect) loss and the second is dielectric loss — the same model cable manufacturers use to publish their own attenuation charts. LMR-series coefficients come directly from the Times Microwave Coax Selection Guide; RG-58, RG-8X, RG-213, and 9913 coefficients are fitted to that same guide's published multi-frequency data for those cable types. This is matched-line loss only (SWR = 1:1) — a mismatched antenna adds further loss beyond what's shown here.