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Letter Visibility Chart

How to determine the maximum readable distance of your letters and numbers.

The calculations are based on an externally (naturally) lighted sign with all upper case Helvetica letters utilizing optimal negative space.

Factors that may affect required letter size are:

  • Color scheme
  • Font selection
  • Traffic and weather conditions
  • Sign standoff.

 

 

The stronger the contrast between the colors of your background and your letters, the better the visibility.

This letter visibility chart has been made for you based on information provided by the California Institute of Technology.

 

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MAXIMUM
READABLE
DISTANCE 
READABLE
DISTANCE
FOR MAXIMUM
IMPACT 
 LETTER
HEIGHT
 
 
 

 100'

 30'

 3"

 150'

 40'

 4"

 200'

 60'

 6"

 350'

 80'

 8"

 400'

 90'

 9"

 450'

 100'

 10"

 525'

 120'

 12"

 630'

 150'

 15"

 750'

 180'

 18"

 1000'

 240'

 24"

 1250'

 300'

 30"

 1500'

 360'

 

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