SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-wavelength-formula

What is the formula for approximate wavelength in meters?

300 divided by the frequency in MHz.

  1. 300 divided by frequency in MHz ✔
  2. Frequency in MHz divided by 300
  3. Frequency in hertz times 300

Why: Wavelength in meters is about 300 divided by the frequency in megahertz. For example, 150 MHz works out to about 2 meters.

Huh, didn't know that: The 300 comes from the speed of light, about 300,000,000 meters per second.

The dad joke
Why did the ham love math? Because 300 over anything is a good wavelength.
Like this card?
Play the game

Sources

  1. NCVEC 2026-2030 Technician Question Pool (Element 2), errata Feb 19, 2026 https://www.ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf

Test yourself in the game

Ham RadioAs a radio wave's frequency increases, what happens to its wavelength?Ham RadioWhat frequency range is called VHF?Ham RadioWhat is the unit of frequency?

That's stuff everyone should know.