DPI Calculator

Calculate DPI (dots per inch) for screens and images based on resolution and diagonal size.

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This DPI calculator helps you determine the dots per inch (DPI) or pixels per inch (PPI) of any screen, display, or image. Simply enter the width and height in pixels, along with the diagonal size in inches, and get instant DPI calculation. Useful for designers, photographers, and anyone working with digital displays to understand pixel density and image quality.

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Enter the width of your screen/image in pixels
Enter the height of your screen/image in pixels
Enter the diagonal size in inches
Click 'Calculate DPI' to see the result
View detailed calculation including pixel count and DPI value

Frequently Asked Questions

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What is DPI?

DPI stands for Dots Per Inch, which measures the pixel density of a screen or image. Higher DPI means sharper, more detailed display quality.

How is DPI calculated?

DPI is calculated using the formula: DPI = √(width² + height²) / diagonal size. This gives you the number of pixels per inch on the diagonal.

What's the difference between DPI and PPI?

DPI (Dots Per Inch) is traditionally used for printing, while PPI (Pixels Per Inch) is used for screens. In digital contexts, they're often used interchangeably to refer to pixel density.

What are typical DPI values?

Standard monitors: 72-96 DPI, Retina displays: 200-300 DPI, Smartphones: 300-500 DPI, High-end printers: 600-1200 DPI.

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