The diameter of one algal cell is approximately

It depends on the species of algae. It is usually measured in µm (micrometers) or µ (microns); values are equivalent. The Euglenoid has a cell diameter of 23 µm, while the Chlamydomonas species is much thinner, at 5-10 µm. The Cladophora species is larger, with cell diameters ranging up to 150 µm.