Pixel Density Calculator (PPI / DPI)
Calculate screen PPI and megapixels from resolution.
Pixel Density Calculator (PPI / DPI)
Calculate screen pixel density (Pixels Per Inch / PPI) based on screen resolution and diagonal size.
Display Specifications
Pixel Density & Metrics
108.79 PPI
3.69 MP
3,686,400 px
16:9
What is the Pixel Density Calculator and How Does It Work?
The Pixel Density Calculator finds a screen's PPI (Pixels Per Inch) from its resolution and diagonal size, along with its total megapixel count - useful for comparing display sharpness or checking if an image has enough resolution for print or a specific screen.
The diagonal resolution in pixels is found using the Pythagorean theorem on the width and height in pixels, then divided by the physical diagonal screen size in inches to get pixels per inch.
Diagonal pixels = √(2560² + 1440²) ≈ 2937.21; PPI = 2937.21 / 27 ≈ 108.79.
Smartphones pack far more pixels per inch than monitors because they are viewed much closer to the eye.
Common Real-World Use Cases
Compare the sharpness of two monitors or phones with different resolutions and screen sizes.
Check whether an image has enough pixel density for high-quality printing (typically 300 PPI or higher).
Understand a target device's pixel density when designing crisp graphics for Retina or high-DPI displays.
- 1Enter the screen's horizontal and vertical resolution in pixels.
- 2Enter the physical diagonal screen size in inches.
- 3View the calculated PPI (Pixels Per Inch), total megapixels, and simplified aspect ratio.
- •Higher PPI means a sharper display, but it matters most relative to viewing distance - phones need higher PPI than TVs viewed from across a room.
- •Print work typically needs at least 300 PPI for crisp, professional-quality output.
Frequently Asked Questions
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