Viewing distance is one of the most important considerations when designing signage. The location of your sign determines how far away people will be when visitors first see it, influencing everything from font size and layout to the amount of information they can comfortably read.
For example, a billboard beside a highway must communicate quickly. Large fonts, strong contrast and concise messages allow motorists to read the sign safely from a distance. In contrast, interpretive signage in parks, museums and outdoor environments is usually viewed much closer, allowing for smaller fonts, more detailed content and a richer visitor experience.
Understanding the expected viewing distance is one of the first steps in designing effective signage. It helps determine appropriate font sizes, viewing angles and the overall balance between text, graphics and white space.
Font sizes
A useful rule of thumb is that for every 3 metres of viewing distance, the text height should increase by approximately 2.5 centimetres.
For example, if your signage will be viewed from 6 metres away, the text height should be at least 5 centimetres to achieve comfortable readability.
This guideline provides a practical starting point. The final font size should also consider the typeface, colour contrast, lighting conditions and the intended audience. Well-designed signage allows visitors to read comfortably without unnecessary effort, helping them focus on the story rather than the sign itself.
