This year Facebook has changed their Photo Upload Size, details will be found below:
Your Page’s profile picture:
Displays at 160×160 pixels on your Page on computers, 128×128 pixels on smartphones and 36×36 pixels on most feature phones
Will be cropped to fit a square
Your Page’s cover photo:
Displays at 828 pixels wide by 315 pixels tall on your Page on computers and 640 pixels wide by 360 pixels tall on smartphones
Doesn’t display on feature phones
Must be at least 399 pixels wide and 150 pixels tall
Loads fastest as an sRGB JPG file that’s 851 pixels wide, 315 pixels tall and less than 100 kilobytes
For profile pictures and cover photos with your logo or text, you may get a better result by using a PNG file.
Cover Photo 828px wide and high 315px
Profile Picture in Header 168px wide and high 168px
Profile Picture on Timeline 32px wide and high 32px
Shared Link Thumbnail 470px wide and high 246px
Thanks,
ZuhaWorldMe