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Screen size calculator
Measure from the screen to the furthest viewer and divide by 6 for presentations (by 4 for detailed or touch work, by 8 for video and signage). That is the image height you need, and a 16:9 panel's diagonal is about twice its height, so a viewer 4 m away needs a 55-inch display for presentations.
Enter your measurement below to get the recommended size and the in-stock displays that fit, or start from a screen size and see how far it carries. Matches come from our 871 in-stock interactive and signage displays, sized using the AV-industry 4/6/8 rule.
Comparing common classroom sizes? Read the 65 vs 75 vs 86-inch buying guide for image dimensions, reach and installation checks.
A viewer 4.0 m away reading presentations & video calls needs an image at least 0.67 m high (4.0 m ÷ 6), which is a 54-inch diagonal on a 16:9 panel. 55 inches is the next standard size up; it carries presentations & video calls to 4.1 m.
295 in-stock displays fit this room, from 55 to 73 inches. Lowest-priced first within each size.
55-inch displays 145 in stock, the recommended size
All 55-inch touch screens All 55-inch signage displays
58-inch displays 1 in stock
All 58-inch touch screens All 58-inch signage displays
65-inch displays 148 in stock
All 65-inch touch screens All 65-inch signage displays
Recommended screen size by viewing distance
The same maths as the calculator, for the distances rooms are usually measured at. Find the row for what people will be reading and the column for the distance to the furthest seat.
| What people are reading | 2 m | 3 m | 4 m | 5 m | 6 m | 8 m |
|---|---|---|---|---|---|---|
| Detailed work (touch, spreadsheets) | 43" | 65" | 86" | Over 98" | Over 98" | Over 98" |
| Presentations & video calls | 32" | 43" | 55" | 75" | 86" | Over 98" |
| Video & signage | 32" | 32" | 43" | 55" | 65" | 86" |
Conference room TV size guide
Typical meeting spaces and the distance from the screen to their back seat. Use these as a starting point, then measure the room and put the real figure in the calculator.
| Room | Seats | Furthest viewer | Presentations and video calls | Spreadsheets and touch work |
|---|---|---|---|---|
| Huddle room | 2 to 4 people | 2.5 m | 43" | 55" |
| Small meeting room | 4 to 6 people | 3.5 m | 50" | 75" |
| Medium meeting room | 8 to 10 people | 5 m | 75" | Over 98" |
| Boardroom | 12 to 16 people | 7 m | 98" | Over 98" |
| Training room or classroom | 20 to 30 people | 8 m | Over 98" | Over 98" |
See it on your wall, to scale
Upload a photo of the wall, or scan the QR code to take one with your phone, then calibrate it against one measurement you know and drag a to-scale display around the photo, switching sizes live from 32 to 98 inches. The photo is processed in your browser and never stored; a photo relayed from your phone is deleted the moment this page picks it up.
Screen size questions, answered
What size screen do I need for my meeting room?
Measure the distance from the screen to the furthest seat and divide by 6 to get the minimum image height for presentation content; a room where the furthest viewer sits 4 m away needs at least a 55-inch display. Divide by 4 instead for detailed work like spreadsheets or interactive touch sessions, or by 8 for passive video. The calculator above does the conversion from height to diagonal for you and shows in-stock displays that fit.
What is the 4/6/8 rule for screen size?
The 4/6/8 rule is the AV-industry guide for sizing a display: the furthest viewer should sit no more than 4 times the image height away for detailed content, 6 times for presentations, and 8 times for passive video or signage. The rule uses the image's height, not its diagonal; a 16:9 display's height is roughly half its diagonal (49%), so a 55-inch display is about 0.68 m tall and suits presentation viewers up to about 4.1 m away, and a 75-inch display is about 0.93 m tall and carries to about 5.6 m.
What size TV do I need for a conference room?
A huddle room where the furthest seat is 2.5 m from the screen needs a 43-inch display for presentations and video calls, a small meeting room at 3.5 m needs 50 inches, a medium room at 5 m needs 75 inches and a boardroom at 7 m needs 98 inches. If the room will read spreadsheets or annotate on a touch panel, size to the 4-times rule instead: 55 inches at 2.5 m and 75 inches at 3.5 m, and beyond about 4.9 m even a 98-inch panel is no longer enough for detailed work.
How far should you sit from an interactive display?
No more than 4 times the image height for interactive and annotation-heavy content, about 3.7 m for a 75-inch panel. Interactive displays also have a reach constraint viewing distance doesn't capture: whoever is presenting needs to touch the whole working area, which is why interactive panels rarely exceed 98 inches and are mounted lower than passive signage.
What size interactive display does a classroom need?
Most classrooms use a 65 to 86-inch interactive display. Under the 4/6/8 rule a 65-inch panel comfortably serves pupils up to about 4.9 m from the screen for teaching content, and an 86-inch panel up to about 6.4 m. For larger or tiered teaching spaces, an interactive projector or a projector with a larger image is usually the better fit.
Read the full answer to what size screen do I need, or browse the ranges: interactive touch displays and digital signage displays. Planning a projector instead? Use the projector throw distance calculator or the projector screen size calculator.
Need help specifying a display for your space? Our technical team can advise on installation, mounting and compatible AV systems: talk to us.