ModsFinder

ChatCalc

by Smallinger

ChatCalc lets players type a math expression into the chat box and replace it with its result before sending.

NeoForgeClient-side onlyMozilla Public License 2.0Open source1.21.1 – 1.21.10

What it does

Players type an expression such as a sum, a product or a trigonometric call into the chat box, press TAB, and the expression is evaluated in place. A live result preview appears above the chat while the expression is being typed, so the answer can be checked before anything is sent. The evaluation runs only on the client, and nothing extra has to be typed as a command or handled by an external tool.

The mod supports the usual operators along with trigonometry, logarithms, square roots and other common functions. Custom functions and constants can be defined, which lets a player keep frequently used formulas ready for real-time evaluation in chat. Because the work happens inside the game, the feature works in single-player and on any server, since no server-side component is involved.

ChatCalc is published for NeoForge only, with files for 1.21.1 and 1.21.10 under the Mozilla Public License 2.0, and its source code and issue tracker are public. The first release is 1.0.0 for 1.21.1, dated 2025-11-12, and this card covers the NeoForge port of the original mod.

Key features

  1. Chat expression evaluation

    An expression typed into the chat box is replaced by its result when TAB is pressed.

  2. Live result preview

    A preview of the result is shown above the chat while the expression is still being typed.

  3. Custom functions and constants

    Players can define their own functions and constants and use them in later expressions.

  4. Trigonometry and logarithms

    Trigonometric functions, logarithms, square roots and the basic arithmetic operators are all supported.

Compatibility

Latest build for each game version and loader.

1.21.101.0.0
1.21.11.0.0
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Questions

Does ChatCalc need to be installed on the server?

No. Players add it to their own game, and a server needs no copy.

Which loader does ChatCalc use?

ChatCalc is published for NeoForge only. Files exist for 1.21.1 and 1.21.10, so it cannot be used on Fabric or Forge.

Can custom functions be saved between sessions?

The description covers defining custom functions and constants for real-time evaluation, but it does not state whether definitions persist after the game closes.

In the catalog

ChatCalc is one of 36,990 Utility mods on ModsFinder, and one of 13,477 Utility mods for NeoForge. 15,569 mods support Minecraft 1.21.10.

Utility mods36,990NeoForge modsMods for 1.21.1015,569

More from Smallinger

All projects
Copper Age Backport1.20.1 – 1.21.1Cinematic Zoom1.21.1 – 1.21.10Simple Voice Chat Group Player Names1.21.1 – 1.21.10Wolf Armor and Storage Legacy1.21.10

Similar mods

Reese's Sodium Options1.16.5 – 26.3Jade 🔍1.16.4 – 26.3Zoomify (Zoom)1.18 – 26.3FancyMenu1.12 – 26.3Controlling1.7.10 – 26.3Euphoria Patches1.7.10 – 26.3

What the author says

Perform mathematical calculations directly in chat – no commands or external tools needed. Supports custom functions, constants, and real-time evaluation. Licensed under MPL-2.0 Original Fabric Mod by RealRTTV NeoForge Port by Smallinger
Smallinger, on the Modrinth page

Official listing

Owner
Smallinger
Published
2025-11-10
Updated on Modrinth
2025-11-12
Facts verified
2026-10-15

Tags

UtilityGame mechanicsSocial
Open on ModrinthCompare