Sound Wavelength
Calculator
Results
- Wavelength (m)
- 3.43
- Half wavelength (m)
- 1.715
- Quarter wavelength (m)
- 0.8575
Music and audio results
| Wavelength (m) | 3.43 |
| Half wavelength (m) | 1.715 |
| Quarter wavelength (m) | 0.8575 |
formula-map diagram
- Wavelength (m)
- 3.43
- Half wavelength (m)
- 1.715
- Quarter wavelength (m)
- 0.8575
Musical and acoustic relationship
Formula
λ = 343 ÷ f (air at 20 °C)= 3.43
Note
This result is a simplified model: it applies the displayed standard formula to the values you entered, assuming twelve-tone equal temperament, a speed of sound of 343 m/s in dry air at 20 °C, an ideal free field with no reflections or air absorption, purely resistive speaker loads and Sabine's diffuse-field assumption. Real rooms, instruments, codecs and amplifiers depart from these idealisations, so measure with proper instruments for critical work.
More in Music and audio
See all →Frequently asked questions
How is a sound's wavelength calculated from its frequency?+
Wavelength equals the speed of sound divided by frequency (λ = v/f). Using the standard speed of sound in air at room temperature, about 343 m/s, a 343 Hz tone has a wavelength of exactly 1 meter.
Why does temperature affect the result?+
The speed of sound in air increases with temperature, roughly 0.6 m/s per degree Celsius, because warmer air molecules transmit pressure waves faster. This means the same frequency has a slightly longer wavelength on a hot day than a cold one, which is why the calculator lets you adjust the speed of sound input.
Why do bass frequencies have such long wavelengths compared to treble?+
Since wavelength and frequency are inversely related, a low 40 Hz bass note has a wavelength of about 8.6 meters, while a high 10,000 Hz tone is only about 3.4 centimeters. This is why low frequencies wrap around obstacles and fill a room more evenly, while high frequencies behave much more directionally.
How is wavelength useful for speaker or room placement?+
Problems like room modes, comb filtering, and speaker/subwoofer placement are all governed by how wavelengths interact with room dimensions and reflective surfaces, so knowing the wavelength of a problem frequency tells you the physical distances (like a quarter-wavelength) relevant to fixing it. This is the underlying math behind acoustic treatment placement guides.
Does wavelength change in materials other than air?+
Yes, sound travels at very different speeds through different media, much faster through water (~1,480 m/s) or solids (~5,000 m/s in steel) than through air, so the same frequency has a correspondingly longer wavelength in those materials. The calculator's air-based defaults don't apply directly to underwater or solid-material acoustics.