Sign Source - Letter Visibility Chart
 
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: : Letter Visibility Chart : :

Letter Height Maximum Impact Maximum Readable distance
5/8” 15’
3/4” the following distances 18’
7/8” will vary approximately 21’
1” 10% with various color 24’
1 1/4” combinations. Maximum 30’
1 1/2” distance in color would 36’
1 3/4” be RED or BLACK 42’
2” on a white background. 48’
2 1/2” 60’
3” 30’ 100’
4” 40’ 150’
6” 60’ 200’
8” 80’ 350’
9” 90’ 400’
10” 100’ 450’
12” 120’ 525’
15” 150’ 630’
18” 180’ 750’
24” 240’ 1000’
30” 300’ 1250’
36” 360’ 1500’
42” 420’ 1750’
48” 480’ 2000’
54” 540’ 2250’
60” 600’ 2500’
Prepared by the California Institute of Technology.

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