Pixels Per Inch Calculator — Display PPI
Find the pixel density (PPI) of any display from a single pixel dimension and its physical size, or reverse-calculate how many pixels fill a measured length at a known PPI.
What to calculate
px
in
Display sharpness: Low density
- 1
Pixels per inch
1,920 ÷ 23.8 = 80.7 - 2
Dot pitch (pixel centre spacing)
25.4 ÷ 80.67 = 0.3149Physical gap between adjacent pixel centres in mm — lower is sharper.
How does this calculator work?
PPI equals pixel count along one axis divided by the physical length of that axis in inches. Dot pitch is 25.4 divided by PPI. At a normal viewing distance, around 300 PPI appears retina-sharp for handheld devices; desktop monitors typically fall between 90 and 160 PPI.
Formula
How this is calculated
Pixels per inch (PPI) measures how tightly packed the pixels are along one physical dimension of a display. To calculate it, divide the pixel count along that dimension by the corresponding physical size in inches: PPI = pixels / size. For example, a monitor with 1920 pixels across a 23.8-inch width has 1920 / 23.8 ≈ 81 PPI. The dot pitch is the inverse: how many millimetres separate adjacent pixel centres — lower is sharper.
In the reverse mode you can find how many pixels occupy a physical length at a given PPI, which is useful when designing UI elements or checking whether a design asset will render at the right size on a specific display. For example, at 96 PPI, a 15.6-inch screen has 96 × 15.6 = 1497.6 pixels along that dimension.
As a rough quality guide: most desktop monitors fall between 90 and 160 PPI; laptops commonly run 150–230 PPI; smartphones often exceed 300 PPI (the approximate "retina" threshold where individual pixels are indistinguishable to the naked eye at normal viewing distance). The retina threshold scales with distance — a TV viewed from 3 metres can appear sharp at 40 PPI.
Frequently asked questions
PPI (pixels per inch) measures physical pixel density on a screen. DPI (dots per inch) originally referred to printer output — how many ink dots a printer places per inch. In common usage the terms are often interchanged for screens, but they are technically distinct.
Measure the screen with a ruler (not the bezel — measure only the active display area) or look up the monitor's spec sheet which lists the viewable width and height separately from the diagonal.
A display around 100–150 PPI is adequate for most photo editing at a typical 60–80 cm viewing distance. Higher PPI (200+) reduces pixel visibility and improves colour grading accuracy, but sharpness perception depends more on panel quality and calibration than raw PPI alone.
Also known as
TG we-Calculate Editorial Team. (2026). Pixels Per Inch Calculator — Display PPI [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/pixels-per-inch-calculator
TG we-Calculate Editorial Team. "Pixels Per Inch Calculator — Display PPI." TG we-Calculate. 2026. https://we-calculate.com/calculator/pixels-per-inch-calculator.
TG we-Calculate Editorial Team, "Pixels Per Inch Calculator — Display PPI," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/pixels-per-inch-calculator
@misc{wecalculate_pixels_per_inch_calculator, title = {Pixels Per Inch Calculator — Display PPI}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/pixels-per-inch-calculator}}, year = {2026}, note = {TG we-Calculate} }
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