Screen Resolution / PPI Calculator
Calculate pixels per inch (PPI), dot pitch, total pixels, and aspect ratio from screen resolution and diagonal size. Compare multiple screens side by side. Includes device presets for iPhone, iPad, MacBook, and common monitors. Detect your current screen resolution automatically.
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Screen Dimensions
Results
Pixels Per Inch (PPI)
108.79
Standard
Dot Pitch
0.2335 mm
distance between pixel centers
Total Pixels
3.69 MP
3,686,400 pixels
Aspect Ratio
16:9
1.778:1
Physical Screen Size
23.53" × 13.24"(59.8 cm × 33.6 cm)
Pixel Density Scale
109 PPI
0100200300400500+
Low (<100) Standard (100-149) Medium (150-199) Med-High (200-299) Retina (300-399) Ultra (400+)
Pixel Grid Preview (approximate)
Low (~72 PPI)
Standard (~110 PPI)
Retina (~326 PPI)
This screen (~109 PPI)
How to Use
- Enter your value in the input field
- Click the Calculate/Convert button
- Copy the result to your clipboard
Frequently Asked Questions
- What is PPI and how is it calculated?
- PPI (Pixels Per Inch) measures the pixel density of a screen. It is calculated by dividing the diagonal resolution in pixels by the diagonal screen size in inches. Formula: PPI = √(width² + height²) / diagonal. For example, a 27-inch 2560×1440 monitor has a PPI of √(2560² + 1440²) / 27 ≈ 108.79 PPI.
- What is the difference between PPI and DPI?
- PPI (Pixels Per Inch) refers to the pixel density of a screen display, while DPI (Dots Per Inch) refers to the print resolution of a printer. In practice, many people use the terms interchangeably when discussing screens, but technically PPI is the correct term for displays. Higher PPI means sharper images and text on screen.
- What PPI is considered "Retina" quality?
- Apple defines "Retina" as a display where individual pixels are indistinguishable at a typical viewing distance. For phones held at ~10-12 inches, this is around 300+ PPI. For tablets at ~15 inches, about 264 PPI. For laptops at ~20 inches, around 220 PPI. For desktop monitors at ~25 inches, roughly 200+ PPI. The key factor is the combination of PPI and viewing distance.
- What is dot pitch?
- Dot pitch is the distance in millimeters between the centers of two adjacent pixels. It is calculated as 25.4 / PPI (since there are 25.4 mm per inch). A smaller dot pitch means pixels are packed more tightly, resulting in sharper images. For example, a 110 PPI monitor has a dot pitch of about 0.23 mm, while a 460 PPI phone screen has a dot pitch of about 0.055 mm.
- How does screen size affect PPI?
- For the same resolution, a smaller screen has a higher PPI because the same number of pixels are packed into a smaller area. A 4K (3840×2160) resolution on a 27-inch monitor gives ~163 PPI, but the same resolution on a 55-inch TV gives only ~80 PPI. This is why phone screens appear much sharper than TVs despite having far fewer total pixels.
- Can this tool detect my screen resolution?
- Yes, the "Detect My Screen" button uses the browser's window.screen API to detect your screen's pixel resolution, accounting for device pixel ratio (e.g., Retina/HiDPI scaling). However, the diagonal screen size cannot be detected programmatically—you'll need to measure it or look up your device specs.