Frequency & Wavelength Converter

Convert between frequency and wavelength for radio and optics using c = 299,792,458 m/s. Identify the spectrum band and fiber-optic windows (850, 1310, 1490, 1550 nm) from any signal.
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Overview

The Frequency & Wavelength Converter translates between frequency and wavelength for radio and optics using the speed of light (c = 299,792,458 m/s). It also identifies the spectrum band of a signal and flags fiber-optic wavelengths in the 800–1700 nm window.

Common Use Cases

How to Use

1
Type a frequency and pick its unit (Hz, kHz, MHz, GHz), or type a wavelength and pick its unit (nm, µm, mm, cm, m).
2
Both directions are always active — each input produces its own results table.
3
Each table includes the spectrum band of the signal.
4
Wavelengths between 800 and 1700 nm show the fiber-optics badge.

Example Scenario

WiFi 2.4 GHz and fiber 1550 nm

Enter 2400 MHz and the calculator returns 0.1249 m (12.5 cm), the well-known WiFi wavelength in the UHF band. Enter 1550 nm and it returns 193.4 THz in the infrared band used by single-mode fiber.

Technical Notes

Wavelength λ and frequency f are related by λ = c / f, where c = 299,792,458 m/s (the speed of light in vacuum).

The band label follows the ITU spectrum bands from ELF up through the optical range, mapping common uses like AM radio, WiFi, radar, and fiber optics.

Fiber optics use the low-loss windows at 850, 1310, 1490, and 1550 nm. The calculator flags any wavelength in the 800–1700 nm range.

Common Mistakes

Frequently Asked Questions

2.4 GHz ≈ 12.5 cm, and 5 GHz ≈ 6 cm. Both sit in the UHF/SHF radio bands.

Common single-mode windows are 1310 nm and 1550 nm (about 228.9 THz and 193.4 THz). Multi-mode links often use 850 nm.

Red light around 700 nm is about 428 THz. Visible light spans roughly 400–750 nm, or about 400–750 THz.

Light travels slower in glass, so the wavelength inside the fiber is shorter than in vacuum, although the frequency stays the same.

Related Topics

Wavelength and frequencySpeed of lightFiber optics wavelengthRadio spectrumITU bands5G mmWave