Wavelength Calculator
Calculate wavelength from frequency and wave speed using λ = v / f. Works for light, sound, and all electromagnetic waves.
Speed of light: 299,792,458 m/s · Sound in air: ~343 m/s
Enter frequency and wave speed to calculate wavelength.
Wavelength Formula
λ = v / f
Where λ (lambda) is wavelength in meters, v is wave speed in m/s, and f is frequency in Hz.
Example: An FM radio station at 100 MHz.
λ = 299,792,458 / 100,000,000 = 2.998 m
λ = 299,792,458 / 100,000,000 = 2.998 m
Electromagnetic Spectrum
| Type | Wavelength | Frequency |
|---|---|---|
| Radio waves | > 1 m | < 300 MHz |
| Microwaves | 1 mm – 1 m | 300 MHz – 300 GHz |
| Infrared | 700 nm – 1 mm | 300 GHz – 430 THz |
| Visible light | 380 – 700 nm | 430 – 790 THz |
| Ultraviolet | 10 – 380 nm | 790 THz – 30 PHz |
FAQ
Does wavelength change in different media?
Yes. When a wave enters a new medium, its speed changes and so does its wavelength. Frequency remains constant.
What is the wavelength of visible light?
Visible light ranges from about 380 nm (violet) to 700 nm (red).
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Last updated: 2026-08-08