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
17" 1280x1024 96 17.0" (43.2 cm) 13.3" x 10.6" (33.7cm x 27.0cm) 1310720
20" 4:3 1600x1200 100 20.0" (50.8 cm) 16.0" x 12.0" (40.6cm x 30.5cm) 1920000
Thinkpad t60 1400x1050 124 14.1" (35.8 cm) 11.3" x 8.5" (28.7cm x 21.5cm) 1470000
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