The most popular guideline for determining the proper sign and banner font size is to make them at least one inch (72 pt.) tall for every 10 feet of viewing distance. As for specific font sizes, according to the James Madison University School of Media Arts & Design, 1 point (pt) is roughly equivalent to 1/72th of an inch.
Banner font sizes should be as big as you need them to be. As a matter of fact, you might want to decide on your banner size only after you’ve figured out the banner font size. If you want your banner’s core message to be readable, you need to make sure its font size is larger than the font sizes of any less crucial information you have on the banner.
Font finder that helps you to identify fonts from any image.
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