Dipole Antenna Length Calculator

Dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground.

Enter the desired operating frequency in megahertz to get a good starting length for a dipole in both feet and meters.

The formula for calculating the approximate length of a dipole is:

Dipole length in feet: 468 / frequency in MHz

Dipole length in meters: 143 / frequency in MHz

These are only approximate values. In practice it's best to make the antenna a little longer than the calculated value and then trim it to get the best SWR value.

Dipole antenna calculator dimensions
Frequency in MHz:

Length of each element:

Total length of dipole:
Reference: The ARRL Antenna Book for Radio Communications