Loading…

How to use Frequency ↔ Wavelength Converter

Enter a frequency in Hz or a wavelength in metres. The tool applies λ = c/f both ways and lists kHz, MHz, GHz, cm and mm values.

Frequently asked questions

What formula converts frequency to wavelength?

λ = c ÷ f, where c is 299,792,458 m/s, the exact speed of light in vacuum.

What wavelength is 100 MHz?

100 MHz gives λ = c/f ≈ 2.9979 m, a typical FM-radio wavelength.

Does this assume a vacuum?

Yes — it uses the vacuum speed of light; in other media, wavelength shrinks by the refractive index.

More Special Unit Converters

Data Transfer Rate Converter
Convert bit/s, kbit/s, Mbit/s, Gbit/s and byte-based KB/s, MB/s, GB/s using SI decimal prefixes and the 8-bits-per-byte relation.
Angle Unit Converter
Convert degrees, radians, gradians, arcminutes, arcseconds and turns for geometry, trigonometry and navigation.
Tire Pressure Converter
Convert tire and general pressure between PSI, bar, kPa, atmospheres and mmHg (torr).
Blood Glucose Converter
Convert blood sugar readings between mg/dL and mmol/L using the standard glucose factor of 18.0182.
Color Temperature ↔ Mired Converter
Convert Kelvin color temperature to and from mireds (mired = 1,000,000 ÷ K) for photography and lighting gel calculations.
Roman Numeral Converter
Convert whole numbers (1–3999) to Roman numerals and parse Roman numerals back to integers with canonical-form validation.
Running Pace ↔ Speed Converter
Convert running pace (min/km, min/mi) to and from speed (km/h, mph) for training and race planning.
Fuel Economy Converter
Convert fuel efficiency between L/100 km, US MPG, imperial (UK) MPG and km/L.
Oven Gas Mark Converter
Convert oven gas marks (1–9) to Fahrenheit and Celsius with a full baking temperature reference table.
Ring Size Converter
Convert ring sizes across US, UK, EU/ISO and inside diameter/circumference in millimetres.
Force Converter
Newtons, kN, lbf, kp, dyne.
Torque Converter
N·m, lb·ft, lb·in, kg·m.

← View all Special Unit ConvertersBrowse all 1,100+ tools →