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What is the formula for approximate wavelength in meters?

300 divided by the frequency in MHz.

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  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.
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References

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

  1. NIST: Time and Frequency from A to Z, U to W www.nist.gov/pml/time-and-frequency-division/popular-links/time-frequency-z/time-and-frequency-z-u-w
    w = 300 / f
    Checked 2026-10-09.

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