Microbes come in lots of different shapes and sizes. We would have to use special dyes and a microscope to see them. We measure them in micrometers or microns. To get an idea of what that looks like 1 millimeter is equal to 1,000 microns and there’s about 25,000 microns in 1 inch! Most bacteria are about 1 to 5 microns in size. We can look at size in lots of different ways, this is just one way. Another way, is genome size. That’s using DNA. Microbes come in lots of very different sizes if you use that method. I hope this answers your question! Let me know if you would like to find out more.