Easily see how much disk space (in KB, MB, & a percentage of your quota) each of your uploaded files takes up.

Roland Rust

Disk Usage

Displays disk space used by your WordPress website.

Hajna Muhammed P

Media Memory Allocation

Control media upload limits and PHP memory allocation for individual WordPress users.

Stephen

My Quota

Keep track of who is writing what and when with My Quota.

Jason LeMahieu (MadtownLems)

University of Wisconsin - Cooperative Extension

This plugin adds a column to the Media Library page that displays the total space used by each media item. For images, this includes the original image as well as any other generated sizes.
This plugin is particularly handy for networks where site owners have a limited space quota.
Additionally, sorting your Media Library by file size is actually a great way to identify duplicate media items.

Media File Sizes

I REALLY needed this, to be able to identify the largest images, and I'm glad to see it still works in April of 2018

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