/calculator

Math calculations and unit conversions

BOOST

gebruder@gebruder

GitHub

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wirken

19321 skills

Install

$ npx -y skills add gebruder/wirken --skill calculator --agent claude-code

How it fires

How this skill gets triggered: by you, by Claude, or both.

Fires itselfAuto-invocation. Claude auto-loads it when your prompt matches the work.
You can call itInvoke it directly when you want it.
Slash command/calculator

Context preview

The summary Claude sees to decide when to auto-load this skill.

Math calculations and unit conversions

SKILL.md

calculator.SKILL.md

name: calculator
description: Math calculations and unit conversions
disable-model-invocation: false
permissions:
  tools:
    allow: [exec]
  egress:
    mode: deny
  inference:
    allow: ["*"]

Calculator

Perform calculations using shell tools.

Arithmetic

Basic math: `echo "scale=4; 355/113" | bc -l`
Percentages: `echo "scale=2; 847 * 0.15" | bc -l`
Powers: `echo "2^32" | bc`
Square root: `echo "scale=4; sqrt(2)" | bc -l`

Python (if available)

For complex math: `python3 -c "import math; print(math.log2(1024))"`

Unit conversions

Bytes to human: `numfmt --to=iec 1073741824` (gives 1.0G)
Human to bytes: `numfmt --from=iec 4G` (gives 4294967296)
Temperature: `python3 -c "c=37; print(f'{c}C = {c*9/5+32}F')"`

Date math

Days between dates: `echo $(( ($(date -d 2025-12-31 +%s) - $(date +%s)) / 86400 )) days`
Date in N days: `date -d "+30 days" +%Y-%m-%d`
Timestamp to date: `date -d @1700000000`

Read it on GitHub ↗

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