Frequency to Wavelength Calculator
Convert frequency to wavelength and back — supports Hz to THz and nm to km with EM spectrum region
Converter
λ = c / f | f = c / λ | c = 299,792,458 m/s
EM spectrum region: Radio Waves
Frequency in All Units
- Hz
- 1 × 10^8 Hz
- kHz
- 100000 kHz
- MHz
- 100 MHz
- GHz
- 0.1 GHz
- THz
- 1 × 10^-4 THz
Wavelength in All Units
- nm
- 2.998 × 10^9 nm
- μm
- 2997920 μm
- mm
- 2997.92 mm
- cm
- 299.792 cm
- m
- 2.99792 m
- km
- 0.00299792 km
Electromagnetic Spectrum
| Region | Min Freq. | Max Freq. |
|---|---|---|
Radio Waves | 0 | 3 × 10^8 Hz |
Microwave | 3 × 10^8 Hz | 3 × 10^11 Hz |
Infrared | 3 × 10^11 Hz | 4 × 10^14 Hz |
Visible Light | 4 × 10^14 Hz | 7.5 × 10^14 Hz |
Ultraviolet | 7.5 × 10^14 Hz | 3 × 10^16 Hz |
X-Rays | 3 × 10^16 Hz | 3 × 10^19 Hz |
Gamma Rays | 3 × 10^19 Hz | ∞ |
Frequently asked questions
What is the formula for frequency and wavelength?
The relationship is λ = c / f, where λ is wavelength in meters, c is the speed of light (299,792,458 m/s in a vacuum), and f is frequency in hertz. Rearranging gives f = c / λ.
What frequency is visible light?
Visible light spans roughly 400–700 nm in wavelength, corresponding to 430–750 THz in frequency. Violet light is around 750 THz (400 nm) and red light is around 430 THz (700 nm).
What frequency is a 2.4 GHz WiFi signal?
A 2.4 GHz WiFi signal has a wavelength of approximately 12.5 cm (0.125 m). At 5 GHz the wavelength is about 6 cm. Both fall in the microwave region of the electromagnetic spectrum.