The quantities and units library for C++

Free and open source software for mathematical and engineering calculations.

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

A Clojure library for units of measurement.

Units of Measurement Demos

An ontology of units of measurements

Dimensionful types for Nim.

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

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

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

Units of measure and conversions between them

A comprehensive list of libraries used for converting, checking, and managing units of measurement and physical quantities