Frequency, wavelength & period
Convert frequency, wavelength and period for your medium. Add a physical length to find delay and electrical length.
Calculate frequency, wavelength and period
Free space · VF 1
- Wavelength
- 122.36 mm
- Period
- 408.16 ps
- Half wave · λ/2
- 61.18 mm
- Quarter wave · λ/4
- 30.59 mm
Phase velocity: 299.79 Mm/s. Constant velocity factor assumed.
Delay & electrical length Optional physical-length check
Leave blank if you only need frequency, period and wavelength.
- One-way phase delay
- 100.07 ps
- Electrical length
- 88.26 °
- Length in wavelengths
- 0.25 λ
One-way phase delay in a constant-velocity medium. Electrical length is unwrapped; 360° is one wavelength.
Wavelength: 122.36 mm. Period: 408.16 ps
Model & assumptions
Frequency counts cycles per second; period is the time for one cycle. With frequency in hertz, the period in seconds is:
Wavelength is the distance travelled during one cycle. The wave speed is the velocity factor VF multiplied by the vacuum light speed , exactly 299,792,458 m/s:
Here is wavelength in metres in the selected medium. A lower VF shortens the wavelength at the same frequency. The tool assumes a uniform medium with constant VF greater than 0 and at most 1; it excludes loss, cutoff and dispersion.
For a physical length in metres, one-way delay is distance divided by wave speed. Electrical length counts 360° for each wavelength:
Delay is in seconds and electrical length is in degrees. Round-trip delay is twice the one-way value. Phase delay equals group delay here because the model keeps wave speed constant with frequency.
For example, 2.45 GHz in free space has a period of approximately 408.16 ps and a wavelength of 122.36 mm. A 30 mm path is 88.26° long.
Does a result look wrong? Report a calculation issue
← All RF tools