I need to display some featured image info on post page. Among other info I need to display file size of image (featured image of post).

I tried this function inside single.php.

function getSize($file){
   $bytes = filesize($file);
   $s = array('b', 'Kb', 'Mb', 'Gb');
   $e = floor(log($bytes)/log(1024));

  return sprintf('%.2f '.$s[$e], ($bytes/pow(1024, floor($e))));

and to echo that:

<?php echo getSize('/wp-content/uploads/2014/06/some-file-name.jpg'); ?>

It works, but I need help to make ti automatically grab featured image url, not to manually enter it in code?

For example I use this to echo featured image ("full") url:

 if ( has_post_thumbnail()) {
   $full_image_url = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'full');
echo $thumb_image_url[0];

Could you please help to combine it, or to provide me with another solution?


1 Answer 1


You can use get_attached_file() to:

Retrieve attached file path based on attachment ID.

And get_post_thumbnail_id() to determine the post thumbnail of the current post, or any post if you set the $post_id parameter. Exemplary usage:

$bytes = filesize(

Use size_format() to

Convert a given number of bytes into a human readable format

$hr_size = size_format( $bytes );

If you are actually want to get the size of one of the intermediate sizes, the above shows the file size of the full image, make use of image_get_intermediate_size(), where:

The metadata 'sizes' is used for compatible sizes that can be used for the parameter $size value.

Which means it uses wp_get_attachment_metadata() to get the data. In addition you need wp_upload_dir() to construct the path. Exemplary usage:

$upload_dir = wp_upload_dir();
$metadata_size = image_get_intermediate_size( 
$path_inter = $upload_dir[ 'basedir' ] . '/' . $metadata_size[ 'path' ];
$bytes = filesize(
$hr_size = size_format( $bytes );
  • I am new to WP. Could you please paste for me exactly what I should put inside single.php to show file size of featured image? For, at least 'full" image size, "medum" image size would be great too? Jun 30, 2014 at 14:53
  • 1
    @user1038179 All you need is outlined in my answer. You really pretty much just have to use it, read the documentation I linked for each functionality. The last code block should definitely get you there. Good luck! Jun 30, 2014 at 16:34
  • Thanks. Still, it is difficult for me to understand which of php codes, with or without any modification, in which order to paste in my single.php? I tried many times, but, I get nothing. Jul 1, 2014 at 6:23

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