Sign Visibility Calculator
Calculate minimum and recommended letter heights for sign legibility at a given viewing distance and vehicle speed.
Inputs
Results
Min Letter Height
16.7 in
Recommended Height
20 in
Est. Sign Width10 ft
Reaction Dist (ft)198
How to Use This Calculator
- Enter the viewing distance (ft) and vehicle speed (mph).
- Review minimum and recommended letter height (in) for legibility at the given distance and speed.
- Check recommended sign width (ft) for the letter layout.
- Use the 1-inch-per-30-feet rule as a starting point: a sign read at 300 ft needs 10-inch letters minimum.
- High-contrast color combinations (dark on light, yellow on black) allow slightly smaller letter sizes.
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