I used to have a nice chart of the number of cells in different sized wells but can not find it. I am trying to work out an MOI for an experiment and need to know how many cells are in a confluent well of a 12 well plate.
The answer is that it depends on the cell type. For MDCK cells ,I usually plate them at 2.5x105 and then infect the next day. If you figure they divide overnight, then somewhere between 4-5x105 per well for fully confluent MDCK cells.