Enter a couple of numbers for your display, and it will tell you the width and height, and the DPI. Simple.

Pixels wide Pixels high

Diagonal (" or cm)

Display name

Name Pixels DPI Diagonal SizePixel Count
30" 2560x1600 101 30.0" (76.2 cm) 25.4" x 15.9" (64.6cm x 40.4cm) 4096000
19" wide 1440x900 89 19.0" (48.3 cm) 16.1" x 10.1" (40.9cm x 25.6cm) 1296000
19" 4:3 1280x1024 86 19.0" (48.3 cm) 14.8" x 11.9" (37.7cm x 30.1cm) 1310720
17" 1280x1024 96 17.0" (43.2 cm) 13.3" x 10.6" (33.7cm x 27.0cm) 1310720
macbook 1280x800 115 13.1" (33.3 cm) 11.1" x 6.9" (28.2cm x 17.6cm) 1024000
ibook 1024x768 106 12.1" (30.7 cm) 9.7" x 7.3" (24.6cm x 18.4cm) 786432

See some scale comparisons.

Matt Johnston
matt .. ucc . asn . au