Engineering units
Accepts Hz through PHz and formats wavelength automatically.
Enter a frequency to calculate wavelength in a readable metric unit, scientific notation in meters, and period for vacuum, air, water, glass, or optical fiber.
Wavelength = v / frequency, where v = 299,792,458 / n meters per second and n is the selected refractive index.
Accepts Hz through PHz and formats wavelength automatically.
Compares vacuum with approximate refractive-index media.
Displays seconds per cycle as a supporting result.
To find wavelength, divide the wave propagation speed by frequency. Frequency must be expressed in hertz, or cycles per second. The result is in meters when speed is in meters per second. The calculator converts kHz, MHz, GHz, THz, and PHz automatically and selects a readable output unit from kilometers down to picometers.
For a vacuum calculation, use 299,792,458 meters per second. In air the difference is small for many everyday estimates. In water, glass, or optical fiber, electromagnetic waves travel more slowly, so wavelength becomes shorter at the same frequency. The selected refractive index supplies a simplified speed estimate.
A free-space wavelength is commonly used for antennas and RF planning, but practical antenna dimensions depend on design, conductor geometry, dielectric materials, velocity factor, matching, bandwidth and environment. Optical calculations may require wavelength-dependent refractive-index data rather than a single representative value.
| Input | What it means | Planning note |
|---|---|---|
| Frequency | Number of cycles per second | Confirm the input prefix: k, M, G, T, or P. |
| Medium | Material through which the wave propagates | Vacuum is the standard free-space reference. |
| Wavelength | Propagation speed divided by frequency | The medium changes speed and wavelength, not source frequency. |
| Period | One divided by frequency | Period is the duration of one cycle. |
Estimate free-space wavelength from radio frequency.
Convert laser or spectroscopy frequency into wavelength.
Explore the inverse relationship among speed, frequency and wavelength.
In vacuum, 1 GHz has a wavelength of approximately 0.2998 meters, or 29.98 centimeters.
Convert MHz to hertz by multiplying by one million, then divide wave speed by that frequency.
The source frequency generally remains unchanged across a material boundary, while speed and wavelength change.
Not necessarily. Antenna dimensions depend on the design, fraction of wavelength, materials, velocity factor and surrounding environment.
Last reviewed: August 23, 2026. Electromagnetic calculations use 299,792,458 m/s in vacuum and the selected refractive-index approximation.
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