How big should the screen be?
The person in the farthest seat decides the screen size, because they need to read what is on it. The classic 4-6-8 rule links that distance to the image height:
- 4× for detailed content: spreadsheets, drawings, small text
- 6× for normal presentations and video calls
- 8× for video and signage, where nobody needs to read fine print
Minimum image height = distance to farthest viewer ÷ 4, 6 or 8
Example
A meeting room where the farthest seat is 6 m from the screen, used for presentations: 6 ÷ 6 = 1.0 m image height. For 16:9 that is about 1.78 m wide and an 81-inch diagonal, so you would choose an 86-inch display.
If the same room is used for spreadsheet reviews, 6 ÷ 4 = 1.5 m image height, which is about 121 inches. That's beyond normal flat panels, so a projector or LED wall becomes the better choice.
When to go further
The 4-6-8 rule is a quick planning tool. For rooms where the content is critical, the AVIXA DISCAS standard gives a more precise answer based on the size of the smallest text on screen.
Common questions
What size screen for a small meeting room?
With the farthest seat at 4 m and normal presentations: 4 ÷ 6 = 0.67 m image height, which is about a 54-inch 16:9 image. A 55-inch display is the minimum, 65 inches gives comfortable margin.
Why use image height and not the diagonal?
Text on screen scales with the image height. Two screens with the same diagonal but different aspect ratios have different heights, and the taller one is easier to read.
Does a dual-screen setup change the size?
No. Each screen must meet the minimum size on its own, since people still read one screen at a time.
Is bigger always better?
Mostly, but people in the front row should not have to turn their heads to see the whole image. In tight rooms, check the front seats as well as the back.