LCD size

Laptop: Toshiba Satelite 4030CDT. I have to replace the LCD screen. How to find out the size of screen.

Thanks

measure diaginal across the scree.
or go to the toshiba website, look up specs of that lapper, or google.com

According to my research that computer's display is:

13.3 in. TFT Active Matrix

If memory serves, that unit is somewhat long-in-the-tooth. It may be more economical to replace it -- even with another one from someplace like eBay -- than to replace the display.