The wavelength of a microwave is the distance between two consecutive peaks or troughs of the wave. It is related to the frequency of the wave by the formula:

```

wavelength = speed of light / frequency

```

where the speed of light is approximately 299,792,458 meters per second (186,282 miles per second).

For a microwave oven operating at a frequency of 2.45 gigahertz (GHz), the wavelength is:

```

wavelength = 299,792,458 meters per second / 2.45 GHz = 0.122 meters

```

This corresponds to a wavelength of about 12.2 centimeters (4.8 inches).

Microwave ovens typically operate at frequencies between 0.9 and 5 GHz, which corresponds to wavelengths between 33 and 6 centimeters (13 and 2.4 inches).