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calculator

Evaluate arithmetic expressions with arbitrary-precision decimal math using big.js.

Updated Jan 25, 2026
Search Tags:#calculator#math#expression-evaluation#parens#arbitrary-precision#big.js#decimal
One-click install
npx skills add https://github.com/attentiondotnet/awesome-copilot-agents --skill calculator-attentiondotnet
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: calculator
Source: https://github.com/attentiondotnet/awesome-copilot-agents/tree/main/skills/calculator
Command: npx skills add https://github.com/attentiondotnet/awesome-copilot-agents --skill calculator-attentiondotnet

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires big.js, and includes scripts (resource) components.

What problem does it solve?

This Skill eliminates floating-point precision errors by performing arithmetic with arbitrary-precision decimal math, ensuring exact results for calculations that involve decimals or very large numbers.

Core Features & Use Cases

  • Arbitrary-precision arithmetic: Uses big.js to compute expressions exactly, avoiding floating-point inaccuracies like 0.1 + 0.2.
  • Expression evaluation: Supports +, -, *, /, ^, parentheses, and unary minus, with operator precedence and right-associative exponent.
  • Use Case: Financial calculations, scientific computations, and data processing where exact decimal results are required.

Quick Start

Install dependencies and build the skill, then evaluate a sample expression:

  • npm ci
  • npm run build
  • npm run calculate "2 + 3 * 4"

Frequently Asked Questions about calculator

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I avoid floating-point errors when calculating decimal expressions in Node.js?▼

To avoid floating-point errors in decimal expressions, use arbitrary-precision arithmetic with the big.js library. This approach computes exact decimal results, preventing standard floating-point inaccuracies like 0.1 + 0.2 yielding 0.30000000000000004.

Can I evaluate math expressions with parentheses and exponents using arbitrary-precision arithmetic?▼

Yes, arbitrary-precision arithmetic supports expression evaluation with parentheses and exponents. It enforces operator precedence and handles right-associative exponents alongside standard addition, subtraction, multiplication, and division operations.

How do I calculate exact financial computations requiring large numbers and decimals?▼

To calculate exact financial computations with large numbers, apply arbitrary-precision decimal math via a deterministic evaluation pipeline. This process handles complex expressions and large numbers without losing precision.

Does big.js support right-associative exponentiation in complex arithmetic expressions?▼

Yes, big.js supports right-associative exponentiation within complex arithmetic expressions. The evaluation pipeline processes unary minus and operator precedence correctly to yield exact decimal math results.

What are the limitations of using arbitrary-precision decimal math for expression evaluation?▼

The primary limitation of arbitrary-precision decimal math is processing overhead compared to native floating-point arithmetic. It is designed for exact decimal results and large numbers rather than high-performance numerical simulations.

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