Screen Viewing Distance Calculator
Find the ideal viewing distance for your TV, monitor, or phone based on screen size and type.
Reduce eye strain with proper positioning.
How Screen Viewing Distance Works
Optimal viewing distance depends on screen size and resolution. Sitting too close causes eye strain; sitting too far makes text and detail difficult to resolve. The goal is to place yourself at a distance where you can see full detail without your eyes working harder than necessary.
Visual acuity standard:
Normal human vision (20/20) can resolve detail at 1 arcminute (1/60 of a degree). At 4K resolution this limits the distance below which individual pixels become visible.
Resolution-based minimum distance (where pixels become invisible):
Min Distance (inches) = (Screen Height in inches × 3438) ÷ Vertical Pixel Count
Worked example — 27-inch 4K monitor (3840×2160):
- Screen height ≈ 13.3 inches (16:9 ratio)
- Min distance = (13.3 × 3438) ÷ 2160 = 45,725 ÷ 2160 = 21.2 inches
At 21 inches or closer, 4K pixels are invisible to normal eyes. At 1080p on the same screen, the threshold is 42 inches — you’d need to sit 3.5 feet away to not see pixels.
Ergonomic recommended distances by screen size:
| Screen Size | Recommended Distance |
|---|---|
| 21–24 inch | 20–28 inches |
| 27 inch | 24–36 inches |
| 32 inch | 30–40 inches |
| 43–50 inch TV | 5–7 feet |
| 65 inch TV | 7–10 feet |
| 85 inch TV | 10–14 feet |
TV distance rule of thumb:
Recommended distance (ft) = Screen diagonal (inches) ÷ 8 to 10
Eye strain prevention tips (20-20-20 rule):
Every 20 minutes, look at something 20 feet away for 20 seconds. This relaxes the ciliary muscle that holds the eye’s lens in focus for near distances — the primary cause of computer-related eye fatigue.