In order to make your Facebook Fan Page look more attractive and to build more audience on this popular networking platform you need to know the dimensions of the Timeline cover photo and your Profile Photo as well which will make your audience recognize you in this tech savvy world which is connected by such networking sites.
Cover photos are 851 pixels wide and 315 pixels tall. If you upload an image that's smaller than these dimensions, it will get stretched to this larger size. The image you upload must be at least 399 pixels wide.
To get the best quality image and fastest load times for your Page, upload an sRGB JPG file that's 851 pixels wide, 315 pixels tall and less than 100 kilobytes.
So just look below image to know the dimensions
Cover photos are 851 pixels wide and 315 pixels tall. If you upload an image that's smaller than these dimensions, it will get stretched to this larger size. The image you upload must be at least 399 pixels wide.
To get the best quality image and fastest load times for your Page, upload an sRGB JPG file that's 851 pixels wide, 315 pixels tall and less than 100 kilobytes.
So just look below image to know the dimensions
Source: blog.firstgiving.com