DPI / PPI Calculator
Print Size from DPI
Calculate print size from image resolution and DPI
Required Pixels for Print
Calculate required image resolution for a target print size
Screen PPI Calculator
Calculate pixel density of a screen
Formula
PPI = √(W² + H²) / Diagonal | Print Size = Pixels / DPI | Required Pixels = Print Size x DPI
Frequently Asked Questions
What is the difference between DPI and PPI?
DPI (Dots Per Inch) refers to physical dots printed by a printer. PPI (Pixels Per Inch) refers to pixels displayed on a screen. While often used interchangeably, DPI is technically for print and PPI for digital displays.
What DPI should I use for printing photos?
300 DPI is the standard for high-quality photo printing. 150 DPI is acceptable for large posters viewed from a distance. 72 DPI is only suitable for screen display. For professional offset printing, 300-600 DPI is recommended.
How many megapixels do I need for a large print?
For a 300 DPI print: 8x10" needs 7.2 MP, 11x14" needs 14 MP, 16x20" needs 29 MP, 24x36" needs 62 MP. You can use lower DPI (200-250) for large prints viewed from further away.
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