🌊 Wavelength & Frequency
Wave properties of light and sound
About this calculator
Wavelength and frequency are two views of the same wave, and this calculator converts between them for light, sound, and radio. Enter a frequency to get the wavelength, or a wavelength to get the frequency, and pick the wave speed — the speed of light for electromagnetic waves or the speed of sound for audio.
Wavelength equals wave speed divided by frequency. Light travels at 299,792,458 metres per second, so a 100 MHz FM station has a wavelength of about 3 metres, while middle-C at 261 Hz in air stretches about 1.3 metres.
Tip: Higher frequency always means shorter wavelength. That is why blue light scatters more than red, and why bass notes bend around obstacles that treble cannot.