The size of a typical bacterial cell can vary greatly depending on the species. However, a common estimate is 1-10 micrometers in diameter.

Here's a breakdown:

* Small bacteria: Some bacteria, like mycoplasmas, are very small, measuring only 0.1-0.5 micrometers in diameter.

* Average bacteria: Many common bacteria, such as *E. coli*, are around 1-5 micrometers in diameter.

* Large bacteria: Some bacteria, like *Thiomargarita namibiensis*, can reach up to 0.75 millimeters in diameter, making them visible to the naked eye!

Note: 1 micrometer (µm) is equal to 1/1000th of a millimeter (mm).

So, while the exact size of a bacterial cell can vary significantly, the range of 1-10 micrometers provides a general idea of their typical dimensions.