nosferatoy / units-converter

A simple utility library to measure and convert between units

Units Converter

A simple library to convert units. Heavily based on convert-units.

An example implementation of the library.

Key Features

• Tree shakable.
• No dependencies.
• Build for es6, cmj and umd.
• Tested to 4 significant figures.

Installation

npm install units-converter --save

Usage

The library provide a simple chained API to transform units of the same type. The units are broken down to modules, so it is possible and recommended, to load only the unite types that you are using.

import { voltage } from 'units-converter';

voltage(1).from('V').to('mV').value;
//1000

or

import * as converter from 'units-converter';

converter.voltage(1).from('V').to('mV').value;
//1000

converter.mass(1).from('lb').to('oz').value;
//16

• Convert unit will return an object of the unit specifed in the "to" function

import { length } from 'units-converter';

length(1200).from('mm').to('m');
 /* {
      value: 1.2,
      unit: 'm',
      system: 'metric',
      singular: 'Meter',
      plural: 'Meters'
    } */

• Convert unit to Best

import { length } from 'units-converter';

// the smallest unit with a value above 1
length(12000).from('mm').toBest();
/* {  
      value: 1.2,
      unit: 'm',
      system: 'metric',
      singular: 'Meter',
      plural: 'Meters'
    } */

// the smallest unit excluding meters
length(12000).from('mm').toBest({ exclude: ['m'] });
 /* {
      value: 1200,
      unit: 'cm',
      system: 'metric',
      singular: 'Centimeter',
      plural: 'Centimeters'
    } */

// the smallest unit with a value equal to or above 10
length(900).from('mm').toBest({ cutOffNumber: 10 });
 /* {
      value: 90,
      unit: 'cm',
      system: 'metric',
      singular: 'Centimeter',
      plural: 'Centimeters'
    } */
    
// the smallest unit with a value equal to or above 10
length(1000).from('mm').toBest({ cutOffNumber: 10 });
 /* {
      value: 100,
      unit: 'cm',
      system: 'metric',
      singular: 'Centimeter',
      plural: 'Centimeters'
    } */

• Possibilities will return an array with the abbreviations of the available units

import { voltage } from 'units-converter';

voltage().from('V').possibilities();
// [ 'V', 'mV', 'kV' ]

• Describe will return an object with all the details of the unit

import { voltage } from 'units-converter';

voltage().describe('V');

/* { 
      unit: 'V', 
      system: 'metric', 
      singular: 'Volt', 
      plural: 'Volts' 
    } */

• List will return and array with the description of all the available units

import { voltage } from 'units-converter';

voltage().list();

/* [
    { 
      unit: 'V', 
      system: 'metric', 
      singular: 'Volt', 
      plural: 'Volts' 
    },
    {
      unit: 'mV',
      system: 'metric',
      singular: 'Millivolt',
      plural: 'Millivolts'
    },
    {
      unit: 'kV',
      system: 'metric',
      singular: 'Kilovolt',
      plural: 'Kilovolts'
    }
  ] */

Units

Length

• mm
• cm
• m
• in
• ft-us
• ft
• fathom
• mi
• nMi

Area

• mm2
• cm2
• m2
• ha
• km2
• in2
• ft2
• ac
• mi2

Mass

• mcg
• mg
• g
• kg
• oz
• lb
• mt
• t

Volume

• mm3
• cm3
• ml
• l
• kl
• m3
• km3
• tsp
• Tbs
• in3
• fl-oz
• cup
• pnt
• qt
• gal
• ft3
• yd3

Volume Flow Rate

• mm3/s
• cm3/s
• ml/s
• cl/s
• dl/s
• l/s
• l/min
• l/h
• kl/s
• kl/min
• kl/h
• m3/s
• m3/min
• m3/h
• km3/s
• tsp/s
• Tbs/s
• in3/s
• in3/min
• in3/h
• fl-oz/s
• fl-oz/min
• fl-oz/h
• cup/s
• pnt/s
• pnt/min
• pnt/h
• qt/s
• gal/s
• gal/min
• gal/h
• ft3/s
• ft3/min
• ft3/h
• yd3/s
• yd3/min
• yd3/h'

Temperature

• C
• F
• K
• R

Time

• ns
• mu
• ms
• s
• min
• h
• d
• week
• month
• year

Frequency

• Hz
• mHz
• kHz
• MHz
• GHz
• THz
• rpm
• deg/s
• rad/s

Speed

• m/s
• km/h
• m/h
• knot
• ft/s

Pace

• s/m
• min/km
• s/ft
• min/km

Pressure

• Pa
• hPa
• kPa
• MPa
• bar
• torr
• psi
• ksi

Digital

• b
• Kb
• Mb
• Gb
• Tb
• B
• KB
• MB
• GB
• TB

Illuminance

• lx
• ft-cd

Parts-Per

• ppm
• ppb
• ppt
• ppq

Voltage

• V
• mV
• kV

Current

• A
• mA
• kA

Power

• W
• mW
• kW
• MW
• GW

Apparent Power

• VA
• mVA
• kVA
• MVA
• GVA

Reactive Power

• VAR
• mVAR
• kVAR
• MVAR
• GVAR

Energy

• Wh
• mWh
• kWh
• MWh
• GWh
• J
• kJ

Reactive Energy

• VARh
• mVARh
• kVARh
• MVARh
• GVARh

Angle

• deg
• rad
• grad
• arcmin
• arcsec

Charge

• c
• mC
• μC
• nC
• pC

Force

• N
• kN
• lbf

Acceleration

• g (g-force)
• m/s2

Road map

• Add types to support better integration with typescript using projects.

• Add functionality for the addition of custom units.

• Add more units, the goal is to approach the amount of units provided by matlab.

• Rewrite the project with typescript.

units-converter's Issues

How to use it with react

Negative number toBest()

power(-2).from('GW').toBest();

Exprected result:

• 2 GW

Actual result:

• 2000000000 W

Support for stones (mass)

Hello,

Is there the possibility to add support for stones in mass, or perhaps a way to easily extend the functions to add any units that are not supported?

Thanks,

area cm2 has incorrect names

units-converter/src/units/area.js

Line 18 in 3c47937

singular: 'Centimeter',

Should this be Square Centimeter(s)?

Thanks for the library!