calculator
Performs arbitrary-precision arithmetic calculations including addition, subtraction, multiplication, division, and exponents. Use when the user asks to calculate, compute, or evaluate math expressions, or when precise decimal arithmetic is needed to avoid floating-point errors.
Best use case
calculator is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
Performs arbitrary-precision arithmetic calculations including addition, subtraction, multiplication, division, and exponents. Use when the user asks to calculate, compute, or evaluate math expressions, or when precise decimal arithmetic is needed to avoid floating-point errors.
Teams using calculator should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/calculator/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How calculator Compares
| Feature / Agent | calculator | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Performs arbitrary-precision arithmetic calculations including addition, subtraction, multiplication, division, and exponents. Use when the user asks to calculate, compute, or evaluate math expressions, or when precise decimal arithmetic is needed to avoid floating-point errors.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
SKILL.md Source
# Calculator Evaluate arithmetic expressions with arbitrary-precision decimal math using [big.js](https://github.com/MikeMcl/big.js/). ## When to Use - User asks to calculate or evaluate a math expression - Precise decimal arithmetic is needed (avoids floating-point errors like `0.1 + 0.2 = 0.30000000000000004`) - Expressions involve parentheses, operator precedence, or exponents ## Supported Operations | Operator | Description | Precedence | | -------- | ----------- | ---------- | | `+` | Addition | 1 | | `-` | Subtraction | 1 | | `*` | Multiplication | 2 | | `/` | Division | 2 | | `^` | Exponent (right-associative) | 3 | | `()` | Parentheses | Highest | ## Usage ```bash cd scripts npm ci || npm install npm run build npm run calculate "<expression>" ``` ## Examples | Input | Output | | ----- | ------ | | `"3 + 2"` | `5` | | `"10 / 4"` | `2.5` | | `"2 ^ 10"` | `1024` | | `"(2 + 3) * 4"` | `20` | | `"1 + 4.5 * (3-6) / 5"` | `-1.7` | | `"-5 + 3"` | `-2` | | `"2 ^ 3 ^ 2"` | `512` (right-associative: 2^9) | ## Edge Cases - **Empty expression**: Throws "Empty expression" error - **Mismatched parentheses**: Throws "Mismatched parentheses" error - **Division by zero**: big.js throws an error - **Exponent must be integer**: big.js `.pow()` requires integer exponents ## Limitations - No trigonometric functions (sin, cos, tan) - No variables or symbolic math - Exponents must be integers - No factorial, modulo, or bitwise operators
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