Unit Computation with Pint

Cognitive prosthetics for unit-aware computation. Use Pint for converting between units, performing unit arithmetic, checking dimensional compatibility, and simplifying compound units.

When to Use Converting between units (meters to feet, kg to pounds) Unit-aware arithmetic (velocity x time = distance) Dimensional analysis (is force = mass x acceleration?) Simplifying compound units to base or named units Parsing and analyzing quantities with units Quick Reference I want to... Command Example Convert units convert convert "5 meters" --to feet Unit math calc calc "10 m/s * 5 s" Check dimensions check check newton --against "kg * m / s^2" Parse quantity parse parse "100 km/h" Simplify units simplify simplify "1 kg*m/s^2" Commands parse

Parse a quantity string into magnitude, units, and dimensionality.

uv run python -m runtime.harness scripts/pint_compute.py \ parse "100 km/h"

uv run python -m runtime.harness scripts/pint_compute.py \ parse "9.8 m/s^2"

convert

Convert a quantity to different units.

uv run python -m runtime.harness scripts/pint_compute.py \ convert "5 meters" --to feet

uv run python -m runtime.harness scripts/pint_compute.py \ convert "100 km/h" --to mph

uv run python -m runtime.harness scripts/pint_compute.py \ convert "1 atmosphere" --to pascal

calc

Perform unit-aware arithmetic. Operators must be space-separated.

uv run python -m runtime.harness scripts/pint_compute.py \ calc "5 m * 3 s"

uv run python -m runtime.harness scripts/pint_compute.py \ calc "10 m / 2 s"

uv run python -m runtime.harness scripts/pint_compute.py \ calc "5 meters + 300 cm"

check

Check if two units have compatible dimensions.

uv run python -m runtime.harness scripts/pint_compute.py \ check newton --against "kg * m / s^2"

uv run python -m runtime.harness scripts/pint_compute.py \ check joule --against "kg * m^2 / s^2"

simplify

Simplify compound units to base or compact form.

uv run python -m runtime.harness scripts/pint_compute.py \ simplify "1 kg*m/s^2"

uv run python -m runtime.harness scripts/pint_compute.py \ simplify "1000 m"

Common Unit Domains Domain Examples Length meter, foot, inch, mile, km, yard Time second, minute, hour, day, year Mass kg, gram, pound, ounce, ton Velocity m/s, km/h, mph, knot Energy joule, calorie, eV, kWh, BTU Force newton, pound_force, dyne Temperature kelvin, celsius, fahrenheit Pressure pascal, bar, atmosphere, psi Power watt, horsepower Output Format

All commands return JSON with relevant fields:

{ "result": "16.4042 foot", "magnitude": 16.4042, "units": "foot", "dimensionality": "[length]", "latex": "16.4042\,\mathrm{ft}" }

Error Handling

Dimensionality errors are caught and reported:

This will error - incompatible dimensions

uv run python -m runtime.harness scripts/pint_compute.py \ convert "5 meters" --to kg

Error: Cannot convert '[length]' to '[mass]'

Related Skills /math-mode - Full math orchestration (SymPy + Z3) /sympy-compute - Symbolic computation