World Size
by Madsbest
World Size shows how much disk space each Minecraft world uses, directly on the World Selection screen, so players need not open a file explorer.
What it does
Players who want to know how large a massive survival world has grown can read the figure without leaving the game. Sizes are shown in readable units such as bytes, KB, MB and GB, and a /worldsize command reports the total from inside the game. The mod is a lightweight client-side utility for Fabric and fits modpack creators, survivalists and anyone clearing out old worlds.
Size calculation runs in the background, so menu navigation stays smooth. Tracking is real-time, and the display sits cleanly in the existing menu layout. World Size is published only for Fabric, for 26.1 – 26.2, and its environment is client and server, so the server and every player need it. The code is open source under the MIT License, and public source code is available.
Key features
Total world size on selection screen
The total disk size of each world appears on the World Selection screen, next to the world it describes.
Worldsize command
The /worldsize command reports the size of the current world while playing.
Automatic unit formatting
Sizes convert automatically to bytes, KB, MB or GB, so the figure is readable at a glance.
Real-time size tracking
Size figures update as the world grows, without a restart or a manual refresh.
Background calculation
Size calculation happens in the background, so menus remain responsive while worlds are measured.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Cleaning up old worlds
Players can compare the footprint of old saves and decide which ones to delete.
Checking a long survival world
A player who has played one world for years can see how much space it occupies now.
Who it’s for: Modpack creators, survival players with large or many worlds, and anyone who manages storage on a shared machine. Players who want the figure in a server-side view need the server to run the mod as well.
How it compares
NBTSize is client-side only, open source under the GNU Lesser General Public License v3.0 only, and covers 1.21.11 – 26.3, so it is a different tool for a different job and does not run on a server. Items Stack is a client and server mod for Fabric under the GNU Lesser General Public License v3.0 only, for 1.21 – 26.2. Stack Size Tweaks runs on Fabric and NeoForge under the MIT License for 1.21 – 26.3, but it changes item stack limits rather than world sizes.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| World Size | Fabric | 26.1 – 26.2 | Client and server | 2026-06-17 |
| NBTSize | Fabric | 1.21.11 – 26.3 | Client-side only | 2026-09-26 |
| Items Stack | Fabric | 1.21 – 26.2 | Client and server | 2026-10-01 |
| Stack Size Tweaks | Fabric and NeoForge | 1.21 – 26.3 | Client and server | 2026-09-25 |
Questions
Which loader does World Size need?
Does World Size have to be installed on the server?
Which game versions are supported?
In the catalog
World Size is one of 4,058 Storage mods on ModsFinder, and one of 2,474 Storage mods for Fabric. 13,894 mods support Minecraft 26.2.
More from Madsbest
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What the author says
World Size is a lightweight, client-side utility mod for Minecraft Fabric that brings more transparency to your world management. Ever wondered how much disk space your massive survival world is actually taking up? With this mod, you no longer need to dive into your file explorer to find out.
Official listing
- Modrinth page
- modrinth.com/mod/world-size
- Owner
- Madsbest
- Published
- 2026-05-08
- Updated on Modrinth
- 2026-06-17
- Facts verified
- 2026-10-15