JavaScript implementation of UCUM (http://unitsofmeasure.org)
var one_inch = ucum.convert(2.54, 'cm', '[in_i]');
console.log(one_inch)
1
var parsed = ucum.parse('km/h');
console.log(parsed);
{ value: 1000, units: { m: 1, h: -1 } }
var canonical = ucum.canonicalize('[in_i]/a');
console.log(canonical);
{ value: 8.048774304763354e-10, units: { m: 1, s: -1 } }
Save and include a <script>
tag for dist/ucum.js
npm install ucum.js
$ git clone https://github.com/jmandel/ucum.js
$ cd ucum.js
$ npm install
$ make