Monitor Size and Appropriate Screen Resolution
The table below is from the Computing Suppliers Federation (an industry group of monitor manufacturers). Some may be happy with a resolution that is outside the ranges quoted, but many users would not. It is unlikely that combinations outside this range would meet ISO 9241/3, the major international standard for monitor ergonomics.
Monitor Nominal Size Typical Image Size Minimum Resolution Maximum Resolution
14" 12.3"-13" 640x480 800x600
15" 13.5"-14" 640x480 1024x768
17" 15.5"-16" 800x600 1280x1024
19" 17.5"-18.1" 1024x768 1280x1024
20"/21" 19"-20" 1024x768 1600x1200
24" 21"-22" 1600x1000 1920x1200