A Rust port of calc (Landon Curt Noll's arbitrary-precision calculator)
About
A Rust port of calc (Landon Curt Noll's arbitrary-precision calculator) that works as:
Details
- Author
- carlomagnoglobal
- Downloads
- 210
- Categories
- Other, Finance
Jump to
- 351 builtins (100%+ coverage of calc’s ~350 functions)
- Exact rational arithmetic – no floating‑point approximations
- Three interfaces: CLI, web REPL, and MCP server
- Arbitrary‑precision transcendentals via Taylor series and Newton’s method
- User‑defined functions, control flow (if/else, while, for), and lists
- Session‑configurable precision and display mode
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
A Rust port of calc (Landon Curt Noll's arbitrary-precision calculator)Command (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
Build with cargo build --release. Use the CLI via rcalc 'expression', the web REPL with rcalc-web (served on localhost:8888), or the MCP server with toRustCalcMCP --mcp. For MCP, perform the initialize handshake then call tools like calc_eval, calc_config, or calc_functions. A detailed MCP tool schema is provided in the repository.
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"a rust port of calc (landon curt noll's arbitrary-precision calculator)": {
"toRustCalcMCP": {
"command": "docker",
"args": [
"run",
"-i",
"--rm",
"ghcr.io/carlomagnoglobal/torustcalcmcp:latest"
]
}
}
}
}McpServers
{
"toRustCalcMCP": {
"command": "docker",
"args": [
"run",
"-i",
"--rm",
"ghcr.io/carlomagnoglobal/torustcalcmcp:latest"
]
}
}toRustCalcMCP
A Rust port of calc (Landon Curt Noll's
arbitrary-precision calculator) that works as:
- rcalc — a calc-compatible command-line calculator
- Web REPL — browser-based interactive calculator
- MCP server — JSON-RPC 2.0 over stdio for LLM/agent integration
Three interfaces, one engine. The numeric core uses exact rational arithmetic
(num-rational over num-bigint), which is the same model calc uses natively —
so 1/3 * 3 is exactly 1, and 2^256 is computed to the last digit.
👉 Getting Started in 2 minutes — new to rcalc? Start here.
👉 Install as Claude Desktop MCP — integrate with Claude Desktop.
Build
```sh
cargo build --release
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