Free viewing distance calculator. Enter screen size and resolution (1080p, 4K, 8K) to get optimal viewing distance by THX, SMPTE, and 4K UHD recommendations.
Enter screen size and resolution to get THX, SMPTE, and 4K UHD recommended viewing distances — the range where you see every pixel without tracking fatigue.
Enter your screen diagonal size and resolution. The tool returns THX optimal (36° horizontal FoV), SMPTE cinema (30°), and the 4K-resolving distance (where you can start to distinguish 4K pixels from 1080p).
THX optimal (36° FoV)
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SMPTE cinema (30° FoV)
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4K UHD max distance
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Viewing angle at THX distance
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Tip: THX targets a 36° horizontal FoV (immersive). SMPTE targets 30° (comfortable cinema). If you sit further than the 4K UHD max, you get no visible benefit from a 4K panel vs 1080p at the same size.
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Viewing Distance Calculator is a free, browser-based screen testing tool that runs the full check instantly in your web browser.
Cost: Free, no signup
Install: None — runs in the browser
Privacy: Runs locally, no uploads
Platforms: Windows, macOS, Linux, Android, iOS
Time: Under a minute
Why Viewing Distance Matters
The same 65-inch TV feels like a drive-in from across the room and like an IMAX from 6 feet away. Viewing distance controls how much of your visual field the screen fills (field-of-view in degrees), which in turn determines immersion, eye comfort, and whether your extra 4K pixels are even visible. Sit too close and you see pixel structure plus feel tracking fatigue. Sit too far and you waste both immersion and resolution. And if your eyes tire quickly even at the recommended distance, the screen itself may be the culprit — a PWM flicker check reveals whether the backlight strobes to dim itself, a common hidden cause of eye strain.
THX, SMPTE, And The 4K Resolving Wall
THX — 36° horizontal FoV: the recommended distance for movie-style immersion. Distance = (screen_width / 2) / tan(18°).
SMPTE — 30° horizontal FoV: more conservative. Gives you cinematic feel without the scanning strain of THX.
4K resolving distance: based on 1 arcminute per pixel — the human eye's acuity limit. Beyond this distance, individual 4K pixels merge visually and you see the same thing you'd see on 1080p at the same panel size.
When 4K Actually Matters
For a 55-inch TV, 4K pixels start to become invisible past roughly 7 feet. So if you sit 10 feet from your 55-inch TV, buying 4K is a waste — you'll see the same image 1080p would give you. Rule of thumb: to see 4K benefits, sit within 1.5 × screen_height. Most living rooms with typical 8-foot couch-to-TV distances only benefit from 4K on 65-inch+ panels. These formulas all need your real panel size — if the spec sheet is long gone, an on-screen ruler calibrated against a credit card can measure the visible screen area directly in centimeters or inches.
Monitor vs TV Recommendations
Desktop monitors are used much closer (typically 24-30 inches) than TVs (7-10 feet), which is why 27-inch 1440p is the productivity sweet spot — you're well within the resolving distance for that resolution. 32-inch 4K is the next step up, at roughly the same arm's-length distance but with sharper text. For gaming, 27-inch 1440p at 2-2.5 feet gives about 50° horizontal FoV — narrower than cinema but intense enough for FPS.
THX recommends about 6 feet (for 36 degree FoV), SMPTE recommends about 7 feet (30 degree FoV). Beyond 7 feet you stop benefiting from 4K resolution at that size.
Does 4K matter at my couch distance?
Only if you sit within roughly 1.5 screen heights. For an 8 foot viewing distance, 4K shows visible benefit on 65 inch and larger panels. On smaller screens from that distance, 4K is indistinguishable from 1080p.
What is the THX recommended viewing distance?
THX recommends a 36 degree horizontal field of view, which is immersive like a cinema. Distance = screen width / 2 / tan(18 degrees). For a 55 inch 16:9 TV that is about 5.7 feet.
How close is too close to a monitor?
Stay outside arm distance divided by 1.6 to avoid eye tracking strain. For a 27 inch monitor that is roughly 22 to 28 inches. Closer than that and you constantly move your eyes side to side.
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