Letter Visibility Chart
This chart is base on uppercase Helvetica lettering in natural lighting situations with optimal negative space.
| Viewing Distance | Max. Impact Distance | Min. Required Letter Height |
| 100 feet | 30 feet | 3 inches |
| 150 feet | 40 feet | 4 inches |
| 175 feet | 50 feet | 5 inches |
| 200 feet | 60 feet | 6 inches |
| 275 feet | 70 feet | 7 inches |
| 350 feet | 80 feet | 8 inches |
| 400 feet | 90 feet | 9 inches |
| 450 feet | 100 feet | 10 inches |
Other factors that may affect visibility and letter size requirements are: font selection, color scheme, traffic and weather conditions and sign standoff.
Last updated: December 5, 2008
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