TV / Monitor screen size comparison

For a small home study room, we normally use a smaller TV or Monitor. We are always told about the TV or monitor size are e.g. 19", 20", 22" ... etc. We know that they are measured diagonally. If I watch a DVD or Blue Ray movie, do we know the real visible size from the screen? 

I have made an interesting measurement on the TV / Monitor screen size for comparison purpose.
Here are the results for a full screen movie;

On a Samsung 19" Monitor (4:3 standard);
Diagonal across the screen : 16" (40.5cm)
Actual viewable horizontal length : 14.75" (37.5cm)
Actual viewable vertical width : 6.25" (16cm)

Hence the actual total viewable size is 92.19 square inches (600 square cm)


On a Viewsonic 19" Monitor (16:9 standard);
Diagonal across the screen : 17.5" (44.5cm)
Actual viewable horizontal length : 16.25" (41cm)
Actual viewable vertical width : 6.75" (17cm)

Hence the actual total viewable screen size is 109.69 square inches (697 square cm)

From simple calculation, the 16:9 standard (though both 2 screens are the same 19" screen) gives you 16.2% more viewable area when you play DVD or Blue Ray movie.

It is an interesting measurement.