I misunderstood your original request, I think. Sounds like you want to know the actual viewable size of the display. Is that what you are trying to determine? Is so, why do you want to know that? It is definitely a 1920X1080 (1080p) monitor (I have a 22 inch version and it is AWESOME). Please expand on your question.
The width & height of the screen, that's all.