Agent skill · software engineering · aiskillstore
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.
Why this skill is useful
Adds a library for arbitrary-precision arithmetic calculations that the AI wouldn't reliably generate on its own.
What it needs
Requires node, npm installed locally. About 1k tokens when loaded. Last updated 2026-08-07. 405 stars on the source repository.
What this skill does
Calculator Evaluate arithmetic expressions with arbitrary-precision decimal math using 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 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
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills aiskillstore/calculator