Wavelength to Frequency Converter
Convert wavelength to frequency using the speed of light. Enter a wavelength in nm, um, mm, cm, or m and get Hz, MHz, GHz, and THz.
Independently verified for accuracy
Calculator by Toolsloft ↗- THz
- 599.584916
- GHz
- 599584.916
- MHz
- 599584916
- Hz
- 599,584,916,000,000
Convert the wavelength of light or a radio wave to its frequency in a vacuum. Enter a wavelength in meters down to nanometers and get the frequency in Hz, MHz, GHz, and THz. Handy for optics, antenna work, and physics problems.
How this is calculated
For a wave in a vacuum, frequency equals the speed of light divided by wavelength, f = c / lambda. This uses the exact defined speed of light, c = 299792458 m/s, after converting the entered wavelength to meters.
How to use
- Enter the wavelength value.
- Choose the wavelength unit.
- Read the frequency in Hz, MHz, GHz, and THz.
Examples
- Green light:
500 nm = 599.6 THz - Radio:
3 m = 99.93 MHz
FAQ
- What speed of light does this use?
- The exact defined value in a vacuum, 299,792,458 meters per second. In a material such as glass or water the wave travels slower, so the frequency would differ.
- What is the formula?
- Frequency equals the speed of light divided by wavelength. Shorter wavelengths give higher frequencies.
- Can I go the other way?
- Yes, wavelength equals the speed of light divided by frequency. This tool handles the wavelength-to-frequency direction.