Frequency Wavelength Calculator
Convert between frequency, wavelength, and wave velocity.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Select which variable to solve for, then enter the other two values. The calculator uses the wave equation v = f times lambda to compute the result. Works for any type of wave: sound, light, water, or electromagnetic.
About Frequency Wavelength
The wave equation v = f times lambda is one of the most fundamental relationships in physics. It connects the velocity of a wave to its frequency and wavelength. This equation applies universally to all types of waves, including sound, light, water waves, and seismic waves. Frequency is how many cycles pass a point per second (Hz), wavelength is the distance between successive peaks, and velocity is the speed at which the wave propagates through the medium.
Frequently Asked Questions
What is the wave equation?
The fundamental wave equation is v = f times lambda, relating wave velocity (v), frequency (f), and wavelength (lambda). Given any two, you can calculate the third.
What velocity should I use for sound waves?
The speed of sound in air at room temperature is approximately 343 m/s. It varies with temperature, humidity, and the medium (faster in water and solids).
What velocity should I use for light?
The speed of light in a vacuum is approximately 3 x 10^8 m/s. In materials like glass or water, light travels slower by a factor of the refractive index.