Quick SWR Calculator for Vertical and Dipole Ham Radio Antennas

Here’s a really simple way of double checking how to much to trim your antenna elements.

You only need to type in the numbers in the Cyan boxes.

  • For Dipoles: Cut / Add the result to each leg
  • For Verticals: Cut / Add result to your vertical radiator

Just type in where it is resonant right now – then type in where you would like it to be resonant and the spreadsheet will auto-calculate the trimming.

Film: How to use the SWR Adjustment calculator.

Thanks to Ted KJ7SNW for the following code:






 
ƒ MHz
λ (Meters)
¼ λ (Meters)
Length (cm)

Current
 
 
 

Desired