PPI check
PPI Calculator: Pixel Density and Pixel Pitch
Enter screen size and resolution to calculate PPI, pixel density, pixel pitch, diagonal pixels, and a quick sharpness read for phones or monitors.
Use the rectangular display diagonal when known. For named devices, the nominal size and calculation diagonal are listed separately. Editing a number switches to custom input.
Inputs
What these numbers say
Calculated PPI
Pixel pitch
0.056 mm
Physical distance between adjacent pixel centres.
Quick read
Very sharp for close-range viewing
This is where many premium phones land. Text and icons usually look clean unless you are comparing side by side with something even denser.
Current input
6.1″ · 2532 × 1170
Custom input
Nearest preset by PPI
Compared with the presets in the selected category. Similar PPI does not mean equal screen size or identical perceived sharpness. Scaling does not change physical PPI.
Reading hint
Consider text size and viewing distance
PPI describes pixel density, not every aspect of display quality. Text settings, viewing distance and your eyesight also affect readability.
Why people check PPI in the first place
Diagonal size only tells you how large the panel is. PPI tells you how tightly the pixels are packed. That is why two 6.7-inch phones can look very different, and why two 27-inch monitors can feel nothing alike at 100% scaling.
How to read the result
For phones, higher PPI usually means denser text and cleaner edges at close range. For monitors, the same number affects readability, scaling, and how much workspace you can really use. The best number depends on distance and device type, not on bragging rights.
- Use pixel pitch when you want the physical spacing between pixels in millimeters.
- Use the device-type toggle because a “good” phone PPI is not the same as a “good” monitor PPI.
When PPI helps with a buying decision
It is most useful when the screen sizes are close and you are trying to judge sharpness, reading comfort, or whether a higher-resolution panel will really change the experience. It is less useful on its own when the devices are meant to be viewed from very different distances.
PPI formula: how the calculator works
PPI is the diagonal pixel count divided by the physical diagonal size. First calculate diagonal pixels with sqrt(width² + height²), then divide that number by the diagonal inches. For example, a 2560 x 1440 display has about 2938 diagonal pixels; on a 27-inch monitor that is about 109 PPI.
- Formula: PPI = sqrt(width pixels² + height pixels²) / diagonal inches.
- For centimeters, convert the diagonal to inches first or calculate pixels per centimeter separately.
Pixel pitch, PPI squared, and what they mean
Pixel pitch is the physical distance from one pixel to the next, usually shown in millimeters. Lower pixel pitch means pixels are packed closer together. PPI squared is a density-per-area idea: it estimates how many pixels fit in a one-inch by one-inch square, but most buying decisions are easier to understand with ordinary PPI and pixel pitch.
When the PPI formula can be misleading
The formula assumes square pixels and a normal display layout. Real sharpness can still change with viewing distance, OS scaling, browser zoom, subpixel layout, panel coating, and content quality. Treat PPI as a clean comparison number, then use the result together with screen size and viewing distance.
FAQ
Is 460 PPI overkill on a phone?
Not really. It is already in the very sharp range, but that is normal for many modern flagship phones viewed at close distance.
Why can two screens with similar PPI still feel different?
Viewing distance, scaling, panel quality, subpixel layout, and the kind of content you look at all matter. PPI is useful, but it is not the whole story.
How do you calculate PPI?
Calculate diagonal pixels with sqrt(width² + height²), then divide by the screen diagonal in inches. That gives pixels per inch.
What is pixel pitch?
Pixel pitch is the physical distance between neighboring pixels, usually in millimeters. Smaller pitch usually means a denser, sharper-looking panel at the same distance.
Is higher PPI always better?
Not always. Higher PPI helps most when you view the screen closely. At normal TV distance or with heavy scaling, extra density may be hard to notice.
What is a good PPI for a monitor?
Around 90-110 PPI is common for comfortable desktop use, while 140-165 PPI feels sharper but often needs scaling. The best range depends on viewing distance, OS scaling, and text size preference.
Can I compare phone PPI and monitor PPI directly?
You can compare the numbers, but the meaning changes because phones are viewed much closer than monitors. A phone needs far higher PPI to look equally crisp at close range.