Facebook Cover Photo Size for 2015
Dimensions for Facebook Page’s profile picture and cover photo?
Page’s profile picture:
160×160 pixels on computers.
140×140 pixels on smartphones
50×50 pixels on most feature phones
** Must be at least 180×180 pixels **
Facebook cover photo dimensions
851 pixels wide by 315 pixels tall on computers
640 pixels wide by 360 pixels tall on smartphones.