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Calcimator

Coaxial Cable Loss Calculator

Calculate signal attenuation from cable type, length, frequency, and connectors. Compare loss across common coax cable types.

Inputs

ft
MHz
dB

Results

Total System Loss

3.9 dB

Loss per 100 ft

3.3 dB

Power Delivered

40.74 %

Cable Loss Only3.3 dB
Connector Loss0.6 dB
Loss per Meter0.108 dB/m
Power Lost59.26 %
How to Use This Calculator
  1. Select cable type (RG-8, LMR-400, LMR-600, RG-58, etc.) from the dropdown.
  2. Enter cable length (ft) and operating frequency (MHz).
  3. Set the number of connectors and loss per connector (dB) (typically 0.1-0.3 dB each).
  4. Review total cable loss, connector loss, and total system feedline loss in dB.
  5. Use total loss in your link budget -- consider upgrading to lower-loss cable for long runs.
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Formula

Total Loss = (Loss/100ft × Length/100) + (Connectors × Loss/Connector)

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