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...)

Units of measure and conversions between them

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

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

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