Lodash for unit conversions

Units by Stak Digital

A highly modular unit conversion library.

For full API docs, visit https://units.js.org

Getting Started

yarn add @stak-digital/units

• OR -

npm install --save @stak-digital/units

Usage

The library is split into three tiers:

• Library (index.js)
• Conversion category (weight.js, length.js)
• Individual function (poundsToKilograms.js)

Library Version

import units from '@stak-digital/units';

const amountInPounds = 60;
const amountInKilograms = units.poundsToKilograms(amountInPounds);
    // 27.2155
     
const amountInInches = 30;
const amountInMeters = units.inchesToMeters(amountInInches);
    // 0.762

Category Version

import convertWeight from '@stak-digital/units/weight';
import convertLength from '@stak-digital/units/length';

const amountInPounds = 60;
const amountInKilograms = convertWeight.poundsToKilograms(amountInPounds);
    // 27.2155
     
const amountInInches = 30;
const amountInMeters = convertLength.inchesToMeters(amountInInches);
    // 0.762

Individual Functions

import poundsToKilograms from '@stak-digital/units/pounds-to-kilograms';
import inchesToMeters from '@stak-digital/units/inches-to-meters';

const amountInPounds = 60;
const amountInKilograms = poundsToKilograms(amountInPounds);
    // 27.2155
     
const amountInInches = 30;
const amountInMeters = inchesToMeters(amountInInches);
    // 0.762

Supported Units

Area

• Acres (ac)
• Hectares (ha)
• Square Feet (ft²)
• Square Kilometers (km²)
• Square Meters (m²)
• Square Yards (yd²)

Temperature

• Kelvin (K)
• Celsius (˚C)
• Fahrenheit (˚F)
• Rankine (˚R)

Computer Data

• bit
• byte
• kilobit
• kilobyte
• megabit
• megabyte
• gigabit
• gigabyte
• terabit
• terabyte
• petabit
• petabyte

Length

• Feet (ft)
• Meters (m)
• Inches (in)

Time

• Days
• Hours
• Minutes
• Seconds
• Milliseconds
• Microseconds
• Nanoseconds

Weight

• Kilograms
• Pounds
• Stones
• Tonnes

Frequency

• Hertz (Hz)
• Kilohertz (kHz)
• Megahertz (mHz)
• Gigahertz (gHz)
• Revolutions per minute (rpm)

Force

• newton (N)
• dyne (dyn)
• kilopond (kp)
• poundal (pdl)
• pound-force (lbf)
• ounce-force (ozf)

Development

Adding a new unit

• If the unit belongs to an existing category, add the unit to that category; otherwise
  • Create a new category file in ./src/data/
    • Each category should have a name and units array
• If the unit exists already, add your desired conversion in the convertTo property; otherwise
  • Create a new unit under the category with a name, symbol and convert to property. Each unit should have at least one convertTo
  • Additionally, a convertTo needs to have a respective unit in the given category to allow interoperability between the units (see below)

{
	"units": [
		{
			"name": "fahrenheit",
			"symbol": "F",
			"convertTo": {
				"celsius": {
					"formula": "(n - 32) * (5/9)",
					"nEqualsOne": -17.22222222222222
				}
			}
		},
		{
			"name": "celsius",
			"symbol": "C",
			"convertTo": {
				"fahrenheit": {
					"formula": "(n * (9/5)) + 32",
					"nEqualsOne": 33.8
				}
			}
		}
	]
}

• Each conversion must have a formula property where the input unit is represented by n and an nEqualsOne value which represents the return value when an input of 1 is put through the formula.

Roadmap

General

• [x] Convert existing functions into json version
• [x] Add expand collapse to each category in the sub-nav and main of docs site
• [ ] Add roadmap to docs site
• [x] add typescript typings

Angles

• Radian (rad)
• Degree (deg)
• Arcminute (amin)
• Arcsecond (asec)

Volume

• Cubic meter (m^3)
• liters (L)
• milliliters (mL)
• cubic feet (cu ft)
• cubic inches (cu in)
• gallons (gal)
• quarts (qt)
• pints (pt)
• fluid ounces (fl oz)
• tablespoons (tbsp)
• teaspoons (tsp)

Velocity

• meters per second (m/s)
• mile per hour (mph)
• kilometer per hour (km/h)
• feet per second (fps)
• knot (kn)
• speed of light (c)
• speed of sound (s)

Fuel Efficiency

• Kilometers per liter (km/L)
• miles per gallon (mi/gal)
• liter per 100 kilometers (L/100km)
• gallons per 100 miles (gal/100mi)

Density

• kilograms per cubic meter (kg/m^3)
• kilograms per liter (kg/L)
• grams per cubic centimeter (g/cm^3)
• ounces per cubic foot (oz/ft^3)
• ounces per cubic inch (oz/in^3)
• pounds per cubic foot (lb/ft^3)
• pounds per cubic inch (lb/in^3)
• ounces per gallon (oz/gal)
• pounds per gallon (lb/gal)

Flow

• cubic meters per second (m^3/s)
• liters per minute (L/min)
• gallons per minute (gal/min)
• cubic meters per hour (m^3/h)

Acceleration

• Meters per second squared (m/s^2)
• galileo (Gal)
• standard gravity (g)
• mile per hour per second (mph/s)
• knot per second (kn/s)

Pressure

• pascal (Pa)
• pounds per square inch (psi)
• atmosphere (atm)
• bar (bar)
• millibar (mbar)
• millimeter of mercury (mmHg)
• kilopascal (kPa)
• megapascal (MPa)

Torque

• Foot-pound (ft·lbf)
• Inch-pound (in·lbf)
• Newton meter (N·m)
• Kilopond-meter (kp·m)

Energy

• joule (J)
• erg (erg)
• kilowatt-hour (kW·h)
• megawatt-hour (MW·h)
• calorie (cal)
• kilocalorie (kcal)
• British thermal unit (Btu)

Viscosity

• pascal seconds (Pa·s)
• poise (P)
• pounds per foot hour (lb/(ft·h))
• pounds per foot second (lb/(ft·s))

Current

• ampere (A)
• abampere (abA)
• statampere (statA)

Charge

• coulomb (C)
• abcoulomb (abC)
• statcoulomb (statC)
• faraday (F)
• milliampere hour (mA·h)

Voltage

• volt (V)
• abvolt (abV)
• statvolt (statV)

Luminance

• candela per square meter (cd/m^3)
• stilb (sb)
• lambert (L)
• footlambert (fL)

Illuminance

• lux (lx)
• phot (ph)
• footcandle (fc)

Radiation

• gray (Gy)
• rad (rad)
• sievert (Sv)
• rem (rem)

Radioactivity

• becquerel (Bq)
• curie (Ci)
• rutherford (rd)

Data Transfer Rate

• bit per second (bit/s)
• kilobit per second (kbit/s)
• kilobyte per second (kB/s)
• kibibit per second (Kibit/s)
• megabit per second (Mbit/s)
• megabyte per second (MB/s)
• mebibit per second (Mibit)
• Gigabit per second (Gbit/s)
• Gigabyte per second (GB/s)
• Gibibit per second (Gibit/s)
• Terabit per second (Tbit/s)
• Terabyte per second (TB/s)
• Tebibit per second (Tibit/s)
• Petabit per second (Pbit/s)
• Petabyte per second (PB/s)
• Pebibit per second (Pibit/s)

Changelog

1.10.0

• Convert to TypeScript

1.8.0

• Add frequency category

1.7.1

• Update docs site with accordions on sections

1.7.0

• Add support for microseconds and nanoseconds
• Add full support for weight units

1.6.0

• Add support for major computer data units

1.5.0

• Add support for square meters
• Add support for square feet
• Add support for square kilometers
• Add support for hectares

1.4.3

• Add styles to docs site and update internal links

1.4.2

• Update development documentation

1.4.1

• Update docs site https://units.js.org

1.4.0

• Add support for Kelvin, Fahrenheit and Celsius conversions

1.3.0

• Add poundsToTonnes function
• Add tonnesToPounds function
• Update docs site

1.2.5

• Replace docs with link to js.org

1.2.4

• Add dynamic docs generation

1.2.3

• Add documentation for time functions

1.2.2

• Add codecov integration

1.2.1

• Add travis-ci integration

1.2.0

• add time functions to time.js
• add millisecondsToSeconds function
• add millisecondsToMinutes function
• add millisecondsToHours function
• add millisecondsToDays function
• add secondsToMilliseconds function
• add minutesToMilliseconds function
• add hoursToMilliseconds function
• add daysToMilliseconds function

1.1.0

• Add stonesToPounds function
• Add poundsToStones function