DPI: 240 dpi inkjet printer

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)
203.2 mm x 114.3 mm = 23225.76 mm2aspect ratio: 1.778 (diagonal: 233.14 mm)
20.32 cm x 11.43 cm = 232.26 cm2aspect ratio: 1.778 (diagonal: 23.31 cm)
8 inch x 4.5 inch = 36 inch2aspect ratio: 1.778 (diagonal: 9.18 inch)

Print Pixel Size

Dots-per-inch
Printer resolution = 240 dpi = 94 dots/cm
Printer pitch = 106 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