Screen size & viewing distance

Pick a screen too small and it's ignored; too big and it's wasted budget. Sizing is a simple relationship between how far away viewers are and what you want them to do.

The sizing ratio

Two practical rules. For detailed content (menus, schedules, dense info): screen diagonal ≈ viewing distance ÷ 4. For headline / glance content: diagonal ≈ distance ÷ 6. So detailed content read from 10 ft (120") wants ≈ a 30" diagonal minimum; from 20 ft, ≈ 60". Round up — under-sizing is the common regret.

Quick reference table

• 6 ft (1.8m): detailed ≈ 18–24", headline ≈ 15".
• 10 ft (3m): detailed ≈ 30–32", headline ≈ 22–24".
• 15 ft (4.6m): detailed ≈ 43–48", headline ≈ 32".
• 20 ft (6m): detailed ≈ 60–65", headline ≈ 43".
• 30 ft (9m): detailed ≈ 86"+ or video wall, headline ≈ 60–65".

Tie it to text size

The screen only works if the text on it is legible — the two calculations go together. Once the panel size is set, size type with the typography & viewing-distance rule (≈1" of cap height per 10 ft).

Context adjustments

Go a size up for moving viewers (they glance briefly), bright ambient light, or wide viewing angles. For very long distances, a single large panel or an LED video wall beats several small screens.

Frequently asked questions

How big a screen do I need for a given distance?
For detailed content, use screen diagonal ≈ viewing distance ÷ 4; for headline content, ÷ 6. From 10 feet that's roughly a 30" screen for detail, and always round up.

Is there one formula for everything?
No — detailed content needs a larger screen (÷4) than glance headlines (÷6), and you size up for motion, bright light or wide angles.

Does screen size fix legibility?
Only partly — pair the right panel size with correctly sized text using the typography guide, or a big screen with tiny text still fails.