# Frequency ⇄ Wavelength Converter (Hz/kHz/MHz/GHz/THz ⇄ m/cm/mm/nm) Convert between frequency and wavelength with selectable medium; results in all common frequency and length units > Canonical page: https://elysiatools.com/en/tools/frequency-wavelength - **Category:** Math & Numbers - **Keywords:** frequency to wavelength, wavelength to frequency, Hz, kHz, MHz, GHz, THz, nm, converter, wave equation, v=fλ, physics, acoustics, optics, RF ## Overview A converter using the universal wave equation v = f · λ. - λ = v / f, f = v / λ, T = 1 / f Frequency units: Hz, kHz, MHz, GHz, THz. Wavelength units: m, cm, mm, µm, nm, Å. Medium presets: air 343 m/s, water 1493 m/s, steel ~5960 m/s, light 299792458 m/s. ## Inputs - **Convert From** (select) - **Frequency (f, Hz)** (select) - **Frequency (f, Hz)** (number): e.g. 100 (in the selected frequency unit) - **Wavelength (λ, m)** (select) - **Wavelength (λ, m)** (number): e.g. 3 (in the selected wavelength unit) - **Medium (wave speed v)** (select) - **Wave Speed (v, m/s)** (number): auto-filled from medium; override when Custom ## When to use - When designing radio frequency (RF) antennas and needing to calculate the physical wavelength corresponding to a specific channel frequency. - When analyzing acoustic waves in different media like air, water, or steel to determine their spatial wavelength. - When working with optical systems or lasers and converting light wavelengths in nanometers to electromagnetic frequencies in terahertz. ## How it works - Select whether you want to convert from a known frequency or a known wavelength. - Choose the propagation medium (such as light/vacuum, air, water, steel, or a custom speed) to set the wave velocity. - Enter your input value, select its unit, and view the calculated wavelength, frequency, and wave period across all supported units instantly. ## Use cases - Calculating the physical length of a 2.4 GHz Wi-Fi antenna in millimeters. - Determining the wavelength of a 1 kHz sonar signal traveling through water. - Converting a 532 nm green laser wavelength to its equivalent frequency in terahertz (THz). ## Frequently asked questions ### What formula does this converter use? It uses the wave equation v = f · λ, where v is wave speed, f is frequency, and λ is wavelength. ### Can I input a custom wave speed? Yes, select 'Custom' under the medium option and enter your specific wave velocity in meters per second (m/s). ### Which medium should I select for radio waves? Select 'Light/Vacuum' since radio waves are electromagnetic waves that travel at the speed of light. ### Does the tool calculate the wave period? Yes, the tool automatically calculates the wave period (T = 1/f) alongside the frequency and wavelength conversions. ### What units of measurement are supported? 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