Frequency and Wavelength Calculator
Convert between frequency and wavelength using c = f × λ for electromagnetic and sound waves, with a live waveform preview.
Convert between frequency and wavelength using the wave equation c = f × λ. Pick electromagnetic waves (speed of light in a vacuum), sound waves (speed of sound in air at room temperature), or enter a custom wave speed for any other medium. An animated SVG preview shows the waveform tightening or stretching as you change values, making it easy to see how frequency and wavelength trade off. Useful for RF and antenna work, optics, acoustics, and physics coursework.
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How to use
- Pick your medium: electromagnetic waves, sound waves, or a custom wave speed.
- Enter whichever value you know — frequency (Hz/kHz/MHz/GHz) or wavelength (m/cm/mm/µm/nm).
- The other field fills in automatically, and the waveform preview updates to show the result.
FAQ
- When a wave enters a new medium, does frequency or wavelength change?
- Frequency (f) stays the same — it's set by the source. What changes is the wave speed (c), and wavelength (λ) scales right along with it. That's why light bends and slows in glass but keeps its color.
- What values does the calculator use for the speed of light and the speed of sound?
- The speed of light in a vacuum is 299,792,458 m/s. The speed of sound is taken as roughly 343 m/s, the standard figure for dry air at 20°C (68°F).
- When should I use the 'custom speed' option?
- Use it whenever a wave travels through something other than a vacuum (for light) or room-temperature air (for sound) — light passing through water or glass, or sound moving through a different medium. Just enter that medium's actual propagation speed and the calculator uses it instead of the built-in defaults.