What is the standard featured image size?

WordPress has a few default sizes:

  • Thumbnail ( Defaults to 150×150 )
  • Medium ( Defaults to 300×300 )
  • Large ( Defaults to 1024×1024 )
  • Full ( Defaults to Original Image Size )

Of course, these can all be changed by visiting the Settings -> Media page in the Admin Panel of your installation. That being said, most the time Themes have their own sizes set for things such as Featured Images. You may want to either contact the theme author via the WordPress support forums, which each theme has their own set of forums, or if it’s a premium theme you should contact their support.

If none of these works just upload a featured image and copy the size that the theme generates, that will always give you your width and height needed.