Propagation and Path Loss
A practical guide to free-space path loss, wavelength-aware intuition, and feedline loss, built to explain what the loss figure really means before you roll it into a larger RF or microwave link budget.
Enter the required engineering values to calculate coax loss with standard RF and radar relationships.
Inputs
This topic also has a deeper guide and a printable reference pack, so you can move from the live answer into the method, assumptions, and worked examples without leaving the topic cluster.
These are the main values the calculator uses. Keep the units consistent and, where relevant, match the assumptions explained in the related guide.
Unit: dB
Enter the value using the unit shown on the field.
Unit: m
Enter the value using the unit shown on the field.
Use this page when you need a quick coax loss estimate for RF, radar, or communications planning.
These calculators follow standard engineering formulas. Real antennas, propagation conditions, clutter, and implementation losses can produce different real-world results.
Use the Quarter-Wave Antenna Length Calculator for quick quarter-wave antenna length estimates in RF, radar, and communications work.
Estimate the line-of-sight path loss between two points from the distance and frequency you enter.
Combine transmitter power, antenna gains, path loss, and miscellaneous losses to estimate received power.
Estimate received power from transmitter power, antenna gains, distance, and frequency using the free-space Friis relationship.