How to calculate screen to body ratio of a phone?

How to calculate screen to body ration of any phone?



























For this you must know the resolution of your phone 
Example : 1600 x 1200
you can calculate it easily by following pattern

r= 1920/1080= 1.78, for the resolution ratio 5.5" of screen display:
s = 5.5 * 25.4 mm/inch = 139.7 mm, for the same value in mm 152.9 mm of height and 75.9 mm of width
The screen-to-body ratio of the OnePlus One is:
stb = 1.78·139.7^2 / ( (1.78^2 + 1) · 152.9 · 75.9) = 71.8 %
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