Frequency to Wavelength Converter
Our free signal & frequency converter handles frequency wavelength conversions. See tables, ratios, and examples for quick reference.
Formula
Wavelength (lambda) = Speed of wave (v) / Frequency (f)
Divide the speed of the wave by its frequency. In vacuum, the speed is 299,792,458 m/s. In other media, divide the vacuum speed by the refractive index. Wave number is the reciprocal of wavelength.
Worked Examples
Example 1: FM Radio Station Wavelength
Problem: What is the wavelength of a 100 MHz FM radio signal in air?
Solution: Wavelength = speed of light / frequency\nlambda = 299,792,458 / 100,000,000\nlambda = 2.998 meters
Result: 100 MHz = 2.998 m wavelength (Radio Wave band)
Example 2: 5G Cellular Wavelength
Problem: Calculate the wavelength of a 28 GHz 5G mmWave signal.
Solution: Wavelength = 299,792,458 / (28 * 10^9)\nlambda = 299,792,458 / 28,000,000,000\nlambda = 0.01071 meters = 10.71 mm
Result: 28 GHz = 10.71 mm wavelength (Microwave band)
Frequently Asked Questions
How do you convert frequency to wavelength?
Wavelength equals the speed of the wave divided by its frequency, expressed as lambda = v / f. For electromagnetic waves in a vacuum, v is the speed of light (299,792,458 m/s). For example, an FM radio station at 100 MHz has a wavelength of 299,792,458 / 100,000,000 = 2.998 meters. In other media like water or glass, the speed is reduced by the refractive index, producing shorter wavelengths.
Does wavelength change in different media?
Yes, wavelength changes when a wave enters a different medium because the wave speed changes while the frequency stays constant. The speed in a medium equals the speed of light divided by the refractive index (n). For example, light in glass (n = 1.5) travels at 2/3 the speed of light, so its wavelength is also 2/3 of what it would be in vacuum. This principle is fundamental to optics, fiber communications, and lens design.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
Can I use Frequency to Wavelength Converter on a mobile device?
Yes. All calculators on NovaCalculator are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.
Is Frequency to Wavelength Converter free to use?
Yes, completely free with no sign-up required. All calculators on NovaCalculator are free to use without registration, subscription, or payment.