Pixels per degree calculator
PPI tells you how dense a screen is, but sharpness depends on how far away you sit. Pixels per degree combines both. Enter your screen and distance to see how sharp it looks from where you actually sit.
Why pixels per degree beats PPI
Pixel density, in pixels per inch, describes the screen alone. But your eyes do not care about inches; they care about angle. A phone held close can look as sharp as a big television across the room, because the pixels fill the same tiny angle. Pixels per degree measures exactly that: how many pixels fit in each degree of your field of view. It combines resolution, screen size and viewing distance into one number.
For normal eyesight, around 60 pixels per degree is the point where individual pixels become hard to distinguish, often called the retina threshold. Below 40 you can usually see pixels on text, and above 60 extra resolution adds little visible detail.
Pixels per degree at 70 cm
Sharpness for common 16:9 screens when you sit about 70 centimetres away.
| Screen | Resolution | Pixels per degree |
|---|---|---|
| 24 inch | 1920 x 1080 | 46 |
| 27 inch | 1920 x 1080 | 42 |
| 27 inch | 2560 x 1440 | 55 |
| 27 inch | 3840 x 2160 | 83 |
| 32 inch | 3840 x 2160 | 72 |
What it means for choosing a monitor
If you sit about 70 centimetres from a 27 inch screen, 1440p gives roughly 55 pixels per degree, which is sharp, while 4K gives about 83, beyond what most eyes can resolve. That is why many people are happy with 1440p at that size and distance, and why 4K needs a bigger screen or a closer seat to show its benefit. The calculator makes that trade-off visible before you spend the money, and before your graphics card has to push four times the pixels.
Use it with the viewing distance calculator to set the angle, and with the monitor and GPU matcher to see which card can drive the resolution you choose.
Limits of the measure
Pixels per degree is a useful guide, not a law. Vision varies from person to person, and sharpness also depends on the display type, the subpixel layout, scaling settings and how good the content is. Text rendering can look better or worse at the same figure on different panels, and games with soft anti-aliasing hide pixels more easily than crisp interface elements do.
Treat 60 as a target for desktop work and 40 to 50 as a comfortable minimum for gaming. If you are between two resolutions, the higher one will always be sharper, but it costs performance. Upscaling can close that gap: see the render resolution calculator.
How to use the pixels per degree calculator
- Enter the horizontal resolution, for example 2560 for a 1440p screen.
- Enter the screen size and choose the shape.
- Measure your viewing distance from eyes to screen.
- Read the pixels per degree and the sharpness label.
- Try a different distance or resolution to see the effect.
Common mistakes to avoid
- Using vertical pixels instead of horizontal ones.
- Judging sharpness from size and resolution without distance.
- Chasing 4K on a small screen far away, where the extra detail is invisible.
Related tools and guides
Keep going with these: Monitor viewing distance and angle calculator, monitor PPI calculator, monitor and GPU matcher, render resolution calculator, DLSS render resolutions guide.
Frequently asked questions
What are pixels per degree?
It is the number of pixels that fit into one degree of your field of view. It combines resolution, screen size and viewing distance into one measure of sharpness. About 60 pixels per degree is where pixels become hard to see for normal eyesight.
How many pixels per degree is good for gaming?
Between 40 and 60 is a comfortable range. Below 35 pixels are easy to see on text, and above 60 extra resolution adds little visible detail while costing performance. Pick a resolution that lands in that range at your normal seating distance.
Is 4K worth it on a 27 inch monitor?
At about 70 centimetres it gives roughly 83 pixels per degree, well above the 60 where pixels vanish. Some people still like the extra smoothness on text, but 1440p at that distance is already sharp. 4K needs far more GPU power, so weigh it up.
How do I increase pixels per degree?
Sit further from the screen, choose a higher resolution at the same size or pick a smaller screen. Moving back slightly is free and raises sharpness immediately. Higher resolutions need a stronger graphics card to maintain frame rates, so check what your card can drive first.
Does the retina threshold apply to everyone?
No. It assumes normal 20/20 vision, and individuals vary. Some people can resolve finer detail and others less. Content matters too: sharp text shows pixels sooner than soft game scenes. Treat the figure as a guide, and trust your own eyes when you try a screen in person.
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