
When you open a PowerPoint or Keynote file, any custom font not installed, will automatically be replaced by your operating system. The first choice you have to make, is whether to use custom fonts or stick to the standard ones installed on your computer. If not, its important you make a number of educated decisions regarding fonts. If you are bound by a corporate presentation template, where font use has already been decided for you, skip this section and move on to the next chapter. What font size are you currently using while delivering presentations to clients or in the classroom? If you are using a font smaller than 24, then I would like to know why? How did you decide on your font size? Leave a comment.Fonts greatly impact the look and feel of your presentation. When in doubt, always go for a bigger font. If you are unfamiliar to the venue then think about the size of the audience. Go to the venue, project your slides and see what font size is clearly visible from the last row. If you are familiar to with the venue, its your conference room or classroom, then try this out. I figured this out by actually going to the classroom earlier one day, putting up my slides and going to the last bench. When I was making presentations in my college classroom, the minimum font size which was visible from the last bench was around 24. If you know your venue you can actually figure this out easily.

Is there a better way to figure out the ideal font size?

The larger the audience size, the bigger will be the venue and the larger the font you would need. Knowing how large is your audience will help you decide your font size better. Remember, the audience member on the back should be able to read the slides without any problem. What is the role of font size in your presentation? If you are delivering the presentation personally on a projector then I advise a minimum font size of 24 for body and 34 for header. Remember, the bigger the font the easier it is to read the presentation. If you are emailing, do not go below font size 18 for body text and 26 for header. What's ideal depends on your medium of delivery: whether you are emailing your presentation or you are going to physically deliver it. 76% of the readers use a font size of 20 and below.

Recently I put up a poll on the blog asking readers "What font size they mostly use in ppts?" The answers were very surprising: 40% readers use a font size of 11 to 15, another 28% use 16 to 20.
