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I have always selected my font size by the eye or educated guess/trial and error but at this point I would like to know where I could find a chart or document with guidelines regarding what font size you should use for this print size considering the viewer will see it from this distance.


While the suggested "Duplicate Question" might have some nice details, as far as I saw from the question and answers, this only targets Street Signs while taking into account car speed limit. This is only a branch of what my question is about.

I am interested in a more general way, a rule of thumbs of some sort that will help you get an idea on how to design something from A4 posters to outdoor billboards.

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    Great question! :o) – Rafael Jul 29 '17 at 11:55
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    I believe I came across an equation for the reading distance of signs somewhere online but I've never been able to find it again. – johnp Jul 29 '17 at 15:48
  • @johnp Something like that would really come in handy. There are times when you could really use an equation of some sort to reassure yourself of your design. – Alin Jul 29 '17 at 16:20
  • @Alin As far as road signage is concerned, road authorities may have guidelines for typesetting those (usually for some sort of DIN variant), but I think other scenarios/fonts will have too many variables to work with... – johnp Jul 29 '17 at 16:39