When deciding what font size to use in your presentation, make sure it is big enough so that the audience can read it. I usually find that any font size less than 24 point is too small to be reasonably read in most presentation situations. I would prefer to see most text at a 28 or 32 point size, with titles being 36 to 44 point size. The only reason I would use a font less than 24 point is when adding explanatory text to a graph or diagram, where you could use a 20 point font size. If you are given a small screen in a big room, your font will look smaller because the image will not be as big as it should be. In this case, see if you can get a larger screen, use a wall instead of a screen to project on, move the chairs closer to the screen or remove the last few rows of chairs. I’ve put together a chart that lists how far away the last row of your audience should be based on the size of screen, font size and visual acuity testing -use the Font Size chart here. (If you are selecting colors and fonts to design a PowerPoint template, you will want to get the book Building PowerPoint Templates Step by step with the experts. Read more and order here.)