How to choose the right monitor size
The best monitor size depends on how far your eyes are from the screen. Too small and you lean forward and squint; too large and you turn your head to see the corners, which strains your neck over a working day. For most desks the comfortable viewing distance is 50 – 80 cm (20 – 32 in), roughly an arm's length. PixelSpan converts that distance into a recommended diagonal and adjusts it for the type of work you do and for ultrawide screens.
Typical sizes by distance
| Viewing distance | 16:9 monitor | Ultrawide 21:9 |
|---|
| 50 – 60 cm (20 – 24 in) | 22 – 24" | 29" |
| 60 – 75 cm (24 – 30 in) | 24 – 27" | 34" |
| 75 – 90 cm (30 – 35 in) | 27 – 32" | 34 – 38" |
| 90 cm + (35 in +) | 32" + | 38 – 49" |
Resolution, PPI and pixels per degree
Pixels per inch (PPI) describes how dense the pixels are on the panel: a 24" Full HD monitor has about 92 PPI, a 27" 1440p monitor 109 PPI and a 27" 4K monitor 163 PPI. But what you actually see depends on distance too. Pixels per degree (PPD) combines both: it counts how many pixels fit in one degree of your vision. Around 60 PPD is the limit of normal 20/20 visual acuity – above it, individual pixels disappear and text looks print-sharp.
PPI = horizontal pixels ÷ screen width (in) · PPD ≈ PPI × distance (in) × tan(1°)
Recommended combinations
- 24" Full HD – budget office use at 50 – 60 cm. Text is acceptable but slightly soft.
- 27" 1440p (QHD) – the best value for most office and gaming setups.
- 27" 4K – very sharp text with 150 % scaling; great for coding and documents.
- 32" 4K – lots of space at 100 – 125 % scaling for spreadsheets and design.
- 34" ultrawide 3440×1440 – replaces two monitors without a bezel in the middle.
One large monitor or two smaller ones?
Dual 24 – 27" monitors are cheap and flexible: one for reference material, one for work. An ultrawide gives a seamless canvas for timelines, spreadsheets and games. Productivity studies show multi-screen setups can speed up tasks that involve comparing or copying information; for focused writing a single screen is enough.
Other features for office monitors
- Ergonomic stand with height, tilt and swivel adjustment – or VESA mounting for an arm.
- USB-C with power delivery (65 – 90 W) to connect and charge a laptop with one cable.
- IPS panel for wide viewing angles and color accuracy.
- Flicker-free backlight and low blue light modes for long days.
- Built-in KVM to share keyboard and mouse between two computers.
Frequently asked questions
What size monitor is best for office work?
At a typical 60 – 75 cm desk distance, a 24 – 27 inch 16:9 monitor is ideal. 27 inch 1440p or 4K is the most popular choice for productivity.
How far should I sit from a 27 inch monitor?
About 60 – 80 cm (24 – 32 in). Closer than 50 cm you will move your head to see the edges.
Is 1080p enough on a 27 inch monitor?
It works, but at 81 PPI text looks soft at normal distance. 1440p or 4K is recommended for 27 inch screens.
What is a good PPI for a monitor?
About 100 – 110 PPI is comfortable at desk distance; 140 PPI or more with scaling gives very sharp text.
Is an ultrawide better than two monitors?
An ultrawide removes the center bezel and suits timelines and spreadsheets; two monitors are cheaper and easier to split between tasks.
About PixelSpan
PixelSpan is an independent, free display calculator for choosing office, programming, design and gaming monitors. It uses standard geometry and visual acuity limits. We are not affiliated with any monitor brand.
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The methodology combines widely published engineering rules of thumb, manufacturer data sheets and the electrical code practices that installers use every day. We review the assumptions regularly and update the calculator when typical product specifications change.
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