Quick Guide: choose screen size, PPI and viewing distance
Step 1 — Define use & distance
Before obsessing over “4K vs 8K,” decide your primary use (office, gaming, editing, home theater) and your viewing distance. For a desk, 20–35 in (50–90 cm) is common; in a living room, 5–12 ft (1.5–3.5 m). Distance drives ideal diagonal and whether higher PPI pays off.
Step 2 — Pick an aspect ratio
16:9 dominates TV/video; 9:16 rules vertical social; 21:9 is ultrawide/cinema; 4:5 and 1:1 are great for feeds. Use the Aspect Ratio Calculator to keep crops clean and on-brand.
Step 3 — Compute physical size & PPI
With the Screen Size Calculator, enter resolution + diagonal to get PPI, physical width×height and area. Same diagonal + higher resolution ⇒ higher PPI ⇒ sharper at close range.
PPI = √(W² + H²) ÷ Diagonal (in)
Step 4 — FOV rules for TV/projector
For balanced immersion, estimate distance by FOV using the TV tool: 30° feels cinematic/relaxed; 40° feels more immersive; a practical middle ground is ~36°.
Distance ≈ (Screen width ÷ 2) ÷ tan(FOV ÷ 2)
Quick reference: recommended distances by TV size (16:9)
| TV Size | 30° FOV | 40° FOV | Typical use |
|---|---|---|---|
| 43″ | ~1.6 m / 5.2 ft | ~1.2 m / 3.9 ft | Small living rooms / large desks |
| 55″ | ~2.1 m / 6.9 ft | ~1.6 m / 5.2 ft | Standard living room |
| 65″ | ~2.5 m / 8.2 ft | ~1.9 m / 6.3 ft | Entry home theater |
| 75″ | ~2.9 m / 9.5 ft | ~2.2 m / 7.2 ft | Immersive home theater |
| 85″ | ~3.3 m / 10.8 ft | ~2.5 m / 8.2 ft | Large rooms / projector |
Best practices for design & print
- For fine prints, export at 300–350 DPI at final size; large signage viewed from afar can work around ~200 DPI.
- Label deliverables with both physical size and pixels: 8x10in_2400x3000px.
- Keep aspect ratio consistent from design → export → upload to avoid letterboxing/cropping.
Glossary
| Term | Definition |
|---|---|
| PPI | Pixels per inch; higher PPI = sharper at the same distance. |
| DPI | Dots per inch in print. Don’t confuse with PPI (display). |
| Aspect ratio | Width:height proportion (e.g., 16:9, 4:5, 1:1). |
| FOV | Field of view in degrees; drives immersion and comfortable seating distance. |
Extended FAQs
What distance for a 65″ 4K TV?
At 16:9, 65″ is comfortable around ~2.5 m (30°) and highly immersive near ~1.9 m (40°). With true 4K content you can sit a bit closer without seeing pixels.
Is 21:9 ultrawide good for productivity?
21:9 gives more usable width and fewer window swaps. Make sure your apps support the ratio, and adjust your seating to a comfortable FOV.
How do I convert pixels to centimeters for print?
Use Utilities: enter pixels and DPI → get exact inches and centimeters.