How do I install the Calculator skill?

Run npx skillmds@latest add dvcrn/calculator-3 in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Calculator safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. Capability flags: executes scripts. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Calculator?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Calculator free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Calculator?

dvcrn (@dvcrn) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Calculator by dvcrn — Agent Skill

Name: Calculator
Rating: 4.5 (4 reviews)
Author: dvcrn

Calculator

Perform mathematical calculations and unit conversions. Use when the user needs to calculate expressions, convert units (length, mass, temperature, volume, area, time), or solve math problems. Supports basic arithmetic (+, -, *, /, %, ^), scientific functions (sin, cos, tan, log, sqrt, etc.), and common unit conversions.

dvcrn Updated Sep 9, 2026 32 repo stars

File contents

Calculator Skill

Perform mathematical calculations and unit conversions.

Usage

Calculate Expressions

python3 scripts/calculator.py calc "<expression>"

Supported operations:

Basic arithmetic: +, -, *, /, %, ^ (or **)
Parentheses for grouping: (2 + 3) * 4
Percentage: 50% → 0.5, 100 + 10% → 110

Math functions:

Trigonometric: sin(), cos(), tan(), asin(), acos(), atan()
Hyperbolic: sinh(), cosh(), tanh()
Logarithms: log() (natural), log10(), log2(), ln()
Powers/roots: sqrt(), pow(), exp()
Rounding: round(), floor(), ceil()
Other: abs(), max(), min(), factorial(), gcd()
Constants: pi, e
Angle conversion: degrees(), radians()

Examples:

python3 scripts/calculator.py calc "2 + 2"
python3 scripts/calculator.py calc "sin(pi/2)"
python3 scripts/calculator.py calc "sqrt(16) + log(10)"
python3 scripts/calculator.py calc "(100 - 20) * 1.5"
python3 scripts/calculator.py calc "2^10"
python3 scripts/calculator.py calc "50% of 200"

Unit Conversions

python3 scripts/calculator.py convert <value> <from_unit> <to_unit>

Supported categories:

Category	Units
Length	m, km, cm, mm, mi, yd, ft, in, nm
Mass	g, kg, mg, lb, oz, t/ton
Volume	l, ml, gal, qt, pt, cup, fl oz, tbsp, tsp
Area	m², km², cm², ha, acre, ft², in²
Time	s, min, h, d, wk, mo, y
Temperature	°C, °F, K

Examples:

python3 scripts/calculator.py convert 100 km miles
python3 scripts/calculator.py convert 70 f c
python3 scripts/calculator.py convert 2.5 kg lb
python3 scripts/calculator.py convert 500 ml cups

Output Format

All commands output JSON:

{"result": 42}
{"result": 3.14159, "category": "length"}
{"error": "Division by zero"}

Error Handling

Common errors and their meanings:

Division by zero - Attempted to divide by zero
Invalid expression syntax - Malformed expression
Unknown function or variable - Used unsupported function/variable
Unsupported unit conversion - Units not in same category or not recognized

---name: calculator-3description: Perform mathematical calculations and unit conversions. Use when the user needs to calculate expressions, convert units (length, mass, temperature, volume, area, time), or solve math problems. Supports basic arithmetic (+, -, *, /, %, ^), scientific functions (sin, cos, tan, log, sqrt, etc.), and common unit conversions.--- # Calculator Skill Perform mathematical calculations and unit conversions. ## Usage ### Calculate Expressions ```bash python3 scripts/calculator.py calc "<expression>" ``` **Supported operations:** - Basic arithmetic: `+`, `-`, `*`, `/`, `%`, `^` (or `**`) - Parentheses for grouping: `(2 + 3) * 4` - Percentage: `50%` → `0.5`, `100 + 10%` → `110` **Math functions:** - Trigonometric: `sin()`, `cos()`, `tan()`, `asin()`, `acos()`, `atan()` - Hyperbolic: `sinh()`, `cosh()`, `tanh()` - Logarithms: `log()` (natural), `log10()`, `log2()`, `ln()` - Powers/roots: `sqrt()`, `pow()`, `exp()` - Rounding: `round()`, `floor()`, `ceil()` - Other: `abs()`, `max()`, `min()`, `factorial()`, `gcd()` - Constants: `pi`, `e` - Angle conversion: `degrees()`, `radians()` **Examples:** ```bash python3 scripts/calculator.py calc "2 + 2" python3 scripts/calculator.py calc "sin(pi/2)" python3 scripts/calculator.py calc "sqrt(16) + log(10)" python3 scripts/calculator.py calc "(100 - 20) * 1.5" python3 scripts/calculator.py calc "2^10" python3 scripts/calculator.py calc "50% of 200" ``` ### Unit Conversions ```bash python3 scripts/calculator.py convert <value> <from_unit> <to_unit> ``` **Supported categories:** | Category | Units | |----------|-------| | Length | m, km, cm, mm, mi, yd, ft, in, nm | | Mass | g, kg, mg, lb, oz, t/ton | | Volume | l, ml, gal, qt, pt, cup, fl oz, tbsp, tsp | | Area | m², km², cm², ha, acre, ft², in² | | Time | s, min, h, d, wk, mo, y | | Temperature | °C, °F, K | **Examples:** ```bash python3 scripts/calculator.py convert 100 km miles python3 scripts/calculator.py convert 70 f c python3 scripts/calculator.py convert 2.5 kg lb python3 scripts/calculator.py convert 500 ml cups ``` ## Output Format All commands output JSON: ```json {"result": 42} {"result": 3.14159, "category": "length"} {"error": "Division by zero"} ``` ## Error Handling Common errors and their meanings: - `Division by zero` - Attempted to divide by zero - `Invalid expression syntax` - Malformed expression - `Unknown function or variable` - Used unsupported function/variable - `Unsupported unit conversion` - Units not in same category or not recognized

Frequently asked questions