The Domain-Correct Quantities and Units Library for C++ — full quantity kind safety, ISO 80000 compliant, C++29 standardization candidate.

A C++14-compatible physical units library with no dependencies and a single-file delivery option. Emphasis on safety, accessibility, performance, and developer experience.

Units of Measurement API

JSR 385 - Reference Implementation

Python library for information extraction of quantities from unstructured text

Swift package for physical quantities

A measurement and data type conversion library for Java, JavaScript and C#

Working with units made easy with automatic unit-check and converting between units

Quantity Calculus for R Vectors

Physical Units for TypeScript

An ontology of units of measurements

Units of Measurement Demos

Physical unit systems (Metric, English, Natural, Planck, etc...)

Dimensionful types for Nim.

Engineering Solver helps to do calculations with units and thermodynamic properties in a very fast way.

Units of measure and conversions between them

Caliper is a project for managing units of measure and the conversions between them.

This project is about numbers: exact (1, e, π, 𝛙, √2, etc.), fuzzy e.g., 1836.152673426(32), or lazy e.g., cos(2π), as quantities (with units)

Basic mathematics library

Type-hinted, simplified interface to `sympy` for solving engineering, science and maths problems.