Wavelength Calculator
Find wavelength, frequency, or wave speed with the wave equation λ = v / f — works for light, sound, radio, and water waves.
Wavelength (metres)
0.78
Breakdown
- Wavelength (millimetres)
- 779.55
- Frequency (Hz)
- 440
- Frequency (kHz)
- 0.44
- Wave speed (m/s)
- 343
- Wave period (ms)
- 2.27
Last updated:
FAQ
What is the wavelength of concert pitch A4?
A4 at 440 Hz in room-temperature air is 343 / 440 ≈ 0.78 m. That's why an 80 cm tube or a room resonance sits right on it — wavelengths near a metre interact strongly with everyday objects.
How do I convert frequency to wavelength for light?
Use c = 299,792,458 m/s: λ = c / f. A handy shortcut is λ(nm) ≈ 3×10¹⁷ / f(Hz), so green light at 5.6×10¹⁴ Hz is about 535 nm.
Does wavelength change between media?
Frequency stays fixed — it's set by the source — while wavelength scales with the wave's speed in the medium. Sound at 440 Hz stretches from 0.78 m in air to 3.36 m in water because sound travels 4.3× faster there.
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