Fluid Levels
by bitbeats
Fluid Levels shows water and lava level numbers above fluid blocks in the world, so players can read flow values without opening the F3 debug menu.
What it does
Source blocks are marked with an S, while flowing fluids show a level from 7 down to 1, with 7 closest to the source. Falling fluids show the level value that the F3 debug menu reports for them. Other fluids can show levels 1 to 8, and the display can be switched on and off with the F7 key.
The mod is aimed at technical players who study how fluid mechanics behave, such as those building water and lava systems. It is a Fabric mod for the client only, so servers do not need it and players can join without installing anything. It is released under the MIT License and is open source, with the source code and issue tracker publicly linked. Builds exist for 1.20.1 – 1.21.11, and the latest Fabric file targets 1.21.11.
Installation needs Fabric Loader and Fabric API. Files are published for eight release versions, 1.20.1, 1.20.4, 1.21.1, 1.21.4, 1.21.6, 1.21.7, 1.21.8 and 1.21.11, and the mod was first released on 2026-02-15.
Key features
In-world fluid levels
Level numbers float above water and lava blocks, so flow values are visible while building or testing.
Source block marker
Source blocks display an S instead of a number, which separates them from flowing fluid at a glance.
Falling fluid values
Falling fluids show the level value that matches the F3 debug menu, so the two readings agree.
F7 toggle
The F7 key turns the level display on or off without changing any game settings.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Testing fluid flow
Players building water or lava contraptions can read flow levels directly in the world as they place blocks.
Learning fluid behavior
Players studying how fluids spread and fall can compare the in-world numbers with the debug screen.
Who it’s for: Players and builders who study fluid mechanics in single-player worlds or on servers, and who want level values visible without leaving the game view.
How it compares
Reservoir Fluid API is a Fabric library for fluids, open source under the GNU Lesser General Public License v2.1 or later, and it is published only for 1.20.1 and runs on client and server. Liquid Lab is also a Fabric mod, open source under the MIT License, for 1.21.1 only, and it runs on client and server. Fluid Levels is client-side only, so it needs no server install.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Fluid Levels | Fabric | 1.20.1 – 1.21.11 | Client-side only | 2026-02-15 |
| Reservoir Fluid API | Fabric | 1.20.1 | Client and server | 2026-09-23 |
| Liquid Lab | Fabric | 1.21.1 | Client and server | 2026-10-14 |
Questions
Does Fluid Levels need Fabric API?
Does a server need to run Fluid Levels?
Which game versions have files?
In the catalog
Fluid Levels is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 19,862 mods support Minecraft 1.21.11.
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What the author says
A client-side Fabric mod that displays water and lava fluid levels directly in the game world. Perfect for technical Minecraft players who need to see fluid mechanics at a glance. Press F7 to toggle the display. Source blocks show S, all other fluids show their level (1-8) as seen in F3.
Official listing
- Modrinth page
- modrinth.com/mod/fluid-levels
- Owner
- bitbeats
- Published
- 2026-02-15
- Updated on Modrinth
- 2026-02-15
- Facts verified
- 2026-10-15