Here is a helpful letter visibility chart that will help you while designing your signs online at WeNeedSigns.com . This is a helpful tool for anyone, even the most experienced designers. The letters will very in visibility depending on color contrast and font style. The best letter style to use is a san serif style font. In typography, a sans-serif or sans serif typeface is one that does not have the small features called “serifs” at the end of strokes.Or in simple terms a “block letter style” is best for visibility. Your signs are advertising “tools” to make people aware of your information, need or to sell a product. Simplicity is always best when designing.
LETTER HEIGHTÂ Â Â Â MAX. IMPACTÂ Â Â READABLE DISTANCE
3 in.               30 ft.            100 ft.
4 in.                40 ft.            150 ft.
6 in.               60 ft.        200 ft.
8 in.               80 ft.            350 ft.
9 in.                90 ft.        400 ft.
10 in.             100 ft.            450 ft.
12 in.              120 ft.            525 ft.
15 in.         150 ft.           630 ft.
18 in.        180 ft.            750 ft.
24 in.            240 ft.        1,000 ft.
30 in.            300 ft.         1,250 ft.
36 in.             360 ft.        1,500 ft.
42 in.             420 ft.        1,750 ft.
48 in.              480 ft.          2,000 ft.
54 in.          540 ft.          2,250 ft.
60 in. Â Â Â Â Â Â Â 600 ft. Â Â Â Â Â 2,500 ft.