Disclaimer: This calculator has been tested and is believed
to be accurate to 6 significant figures. User assumes all risks for its use.
Here is a simple JavaScript routine that converts between frequency and wavelength
in the electromagnetic field realm.
Wavelength and frequency are related by the following formula:
c = λ * ν * √ε_{r}
where c = speed
of light λ
= wavelength
ν = frequency
ε_{r} = relative permittivity
G = GHz M = MHz k = kHz H = Hz 
k = kilometer m = meter cm = centimeter mm = mm nmi = nautical mile
mi = statute mile yd = yard ft = foot in = inch mil = 1000ths of an
inch 
A table of calculated values can be found here:
Frequency  Wavelength Conversion Table
Here are some familiar objects and their equivalent wavelengthrelated
frequencies in air:
Hummer H2 (189.8 in) = 62.2 MHz
Golden Gate Bridge (6,450
ft) = 153 kHz
Earth Equatorial Diameter (7,926 mi) = 23.5 Hz

0402 Surface Mount Capacitor (0.040 in) = 295 GHz
Ticonderoga #2 Wooden Pencil (7.5") = 1.57 GHz
Meter Stick (1 m) = 300 MHz
Boeing 747400 (231'10") = 4.24 MHz
Channel Tunnel, "Chunnel"
(37 km) = 8.10 kHz

