DPI Calculator
From Width
From Diagonal
Formula
DPI = diagonal pixels / diagonal inches. Diagonal pixels = sqrt(width² + height²). Dot pitch (mm) = 25.4 / DPI.
Frequently Asked Questions
What is the difference between DPI and PPI?
DPI (dots per inch) originally refers to printer resolution, while PPI (pixels per inch) refers to screen resolution. They are often used interchangeably for screens.
What is a good DPI for a monitor?
Standard monitors are around 96 PPI. Retina/HiDPI displays are 200+ PPI. Higher PPI means sharper text and images.
You may also need
~
Screen Size Calculator
Free screen size calculator. Calculate screen width, height, and area from diagonal size and aspect ratio.
Everyday~
Image Resolution Calculator
Free image resolution calculator. Calculate megapixels, aspect ratio, and print size at various DPI from image dimensions.
Everyday~
Print Size Calculator
Free print size calculator. Determine maximum print dimensions from image resolution and desired DPI with quality rating.
Everyday