DPI calculator

Use this calculator to find out how many pixels (resolution) an image should have to be printed at a certain size.

Print Dimensions

Net dimensions (no bleed)
508 mm x 285.75 mm = 145161 mm2aspect ratio: 1.778 (diagonal: 582.85 mm)
50.8 cm x 28.58 cm = 1451.86 cm2aspect ratio: 1.777 (diagonal: 58.29 cm)
20 inch x 11.25 inch = 225 inch2aspect ratio: 1.778 (diagonal: 22.95 inch)

Print Pixel Size

Dots-per-inch
Printer resolution = 96 dpi = 38 dots/cm
Printer pitch = 265 µm / micrometer (size of 1 pixel)
Net dimensions (no bleed)
1920 px x 1080 px = 2.1 megapixels
= aspect ratio 1.778

Some examples

References