JJCalculator
by JavaJumper
JJCalculator adds a client-side calc command that evaluates a typed expression in the game chat and prints the result there.
What it does
A player opens the chat and types the calc command followed by a mathematical expression. The mod evaluates the expression and displays the result in chat. Simple sums, differences, products and quotients are covered, and the expression can be more complex, with parentheses and exponentiation. Trigonometric functions are included for angle and wave calculations, so a player can solve simple equations or work through longer formulas without leaving the game.
The mod runs on the client alone, so only the player who installs it can use the command. Evaluation is handled by the exp4j Java library. The mod is built for Fabric and is published across 21 release versions, under the GNU General Public License v3.0 only, which makes the code open source. Its public source code and issue tracker are linked from the project page.
Key features
Calc command
Typing calc in the chat opens the command, and the expression that follows is evaluated on the client.
Basic arithmetic
Sums, differences, products and quotients are evaluated, for example calc sum 5 3 or a plain expression with the usual operators.
Parentheses and exponents
Nested parentheses and exponentiation are supported, so longer expressions are evaluated in standard order.
Trigonometric functions
Sine, cosine and other trigonometric functions can be used inside an expression for angle-based calculations.
Gallery
Compatibility
Latest build for each game version and loader.
1.21.x9 of 9 versions with builds
1.20.x7 of 7 versions with builds
1.19.x5 of 5 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who want to calculate values without leaving Minecraft. Because it is client-side only, single-player players and anyone on a server can use it without asking the server owner to install anything.
How it compares
PortalCalc is a Fabric mod for 1.21.11, client-side only and open source under the MIT License. Star Calculator is a Fabric mod for 26.2 – 26.3, also client-side only and open source under the MIT License. MI-84 Calculator is a Fabric mod for 1.21.1 that is client-side only, but it is not open source and is covered by a custom license, while JJCalculator is covered by the GNU General Public License v3.0 only.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| JJCalculator | Fabric | 1.19 – 1.21.8 | Client-side only | 2023-10-13 |
| PortalCalc | Fabric | 1.21.11 | Client-side only | 2026-08-30 |
| Star Calculator | Fabric | 26.2 – 26.3 | Client-side only | 2026-09-20 |
| MI-84 Calculator | Fabric | 1.21.1 | Client-side only | 2026-08-05 |
Questions
Does JJCalculator need Fabric API?
Does the server have to run JJCalculator?
Which Minecraft versions does JJCalculator support?
In the catalog
JJCalculator is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 17,695 mods support Minecraft 1.21.8.
More from JavaJumper
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What the author says
The Minecraft /calc command mod is a versatile addition to your game that allows you to perform complex mathematical calculations using the exp4j Java library. Whether you need to solve simple equations or compute more intricate expressions, this mod provides a convenient way to harness the power of mathematics…
Official listing
- Modrinth page
- modrinth.com/mod/jjcalculator
- Owner
- JavaJumper
- Published
- 2023-10-13
- Updated on Modrinth
- 2023-10-13
- Facts verified
- 2026-10-15