ucum.js

JavaScript implementation of UCUM (http://unitsofmeasure.org)

Units conversion

ucum.convert: Convert a value (represented as a Javascript Number) from one UCUM unit (represented as a case-sensitive UCUM string) to another, assuming they are conformant.

var one_inch = ucum.convert(2.54, 'cm', '[in_i]');
console.log(one_inch)

1

Units parsing

ucum.parse: Parse a string into a ucum.js JSON representation (an object with value as a Number, and units as an Object where keys are case-sensitive UCUM unit names and values are integers representing an exponent).

var parsed = ucum.parse('km/h');
console.log(parsed);

{ value: 1000, units: { m: 1, h: -1 } }

Units canonicalization

ucum.canonicalize: Parse a string into a ucum.js JSON representation (an object with value as a Number, and units as an Object where keys are case-sensitive UCUM unit names and values are integers representing an exponent), and convert this to an expression where all units properties are reduced to the following base units: meter, second, gram, radian, kelvin, coulomb, candela.

var canonical = ucum.canonicalize('[in_i]/a');
console.log(canonical);

{ value: 8.048774304763354e-10, units: { m: 1, s: -1 } } 

To use in browser

Save and include a <script> tag for dist/ucum.js

To use in Node.js

npm install ucum.js

To build

$ git clone https://github.com/jmandel/ucum.js
$ cd ucum.js
$ npm install
$ make