This collection discusses the concept of Units.  It first provides you with a set of conversion calculators that will allow you to convert amounts between hundreds of combinations of units.  We start with the list of calculators because the best way to understand units is to use them to compare common measurements.

See the table below that contains links to calculators that can perform unit conversion between hundreds of different units.

Contents

What is a Unit

Units are the gauge or measuring stick by which we compare things across the universe.  Units give a measurable dimension to objects and concept and thoughts.

We naturally think in units when we say things like:  

  • I am five feet ten inches tall.  
  • The package weighs 2.4 kilograms.
  • The star is a 100,000 light years from us.
  • The speed limit is 60 miles per hour.

In these examples we are comparing our height, the weight of a package, the distance to a star, and the speed of a car to a standard unit.  In today's word most scientific communities use the SI system of units as the standard units system.

We measure many things in our every day lives in commonly understood units: in seconds and feet and meters and pounds and kilograms and volts and amps and cubic centimeters and ...

vCalc Unit Conversion Calculators

The following table contains links to vCalc conversion calculators that allow you to enter a measurement in one unit and convert it to different units.  Below each calculator link is listed the units that vCalc will handle inherently in its equations' Groovy code.  So, you can build an equation that will input values in many units and use those units to compute output answers also with units. 

The table lists all the units that are naturally provided with any vCalc equation.  Acceleration, as an example, is represented by three units in any vCalc equation that uses acceleration as a parameter:  meters/second2,  foot/second2  and gravity.  Note that when you use units within the Groovy code for the vCalc equation, units are represented inside the code by the abbreviation shown in parentheses below.  See vCalc Help on Units if you wish to build your own vCalc equation and use units naturally within the calculations.

meters/second2 (m/s2)  |  foot/second2 (ft/s2)  |  gravity (grav)  

Electric Potential

Volt (V)  |  Millivolt (mV)

Money Per Mass

US Dollars/Ounce (USD/oz)  |  US Dollars/Pound (USD/lb)  |  US Dollars/US Ton (USD/ton_us)  |  Euro/Gram (EUR/g)  |  Euro/Kilogram (EUR/kg)  |  Euro/Ton (EUR/t)  |   British Pound/Gram (GBP/g)  |  British Pound/Kilogram (GBP/kg)  |  British Pound/Ton (GBP/t)  |  Japanese Yen/Gram (JPY/g)  |  Japanese Yen/Kilogram (JPY/kg)  |  Japanese Yen/Ton (JPY/t)  |    Indian Rupee/Gram (INR/g)  |  Indian Rupee/Kilogram (INR/kg)  |  Indian Rupee/Ton (INR/t)  |  Chinese yuan renminbi/Gram (CNY/g)  |  Chinese yuan renminbi/Kilogram (CNY/kg)  |  Chinese yuan renminbi/Ton (CNY/t)

mole (mol)  |  atom (atom)  |  osmole (osmole)

Electric Resistance

Ohms (`Omega`)  |  Milliohm (m`Omega`)  |  Kilo-ohm (k`Omega`) 

US Dollars/Liquid Ounce (USD/oz_liquid)  |  US Dollars/Quart (USD/qt)  |  US Dollars/Gallon (USD/gal)  |  Euro/Centiliter (EUR/cL)  |  Euro/Liter (EUR/L)  |  Euro/Meter3 (EUR/m3)  |   British Pound/Centiliter (GBP/cL)  |  British Pound/Liter (GBP/L)  |  British Pound/Meter3 (GBP/m3)  |  Japanese Yen/Centiliter (JPY/cL)  |  Japanese Yen/Liter (JPY/L)  |  Japanese Yen/Meter3 (JPY/m3)  |    Indian Rupee/Centiliter (INR/cL)  |  Indian Rupee/Liter (INR/L)  |  Indian Rupee/Meter3 (INR/m3)  |  Chinese yuan renminbi/Centiliter (CNY/cL)  |  Chinese yuan renminbi/Liter (CNY/L)  |  Chinese yuan renminbi/Meter3 (CNY/m3)
radian (rad)  | centiradian (centiradian)  |  degree angle (o) |  grade (grade) |  minute angle (')  |  revolution (rev)  |  second angle (")

Energy

Joule (J)  |  Foot Pound Force (ft_lbf) |  milliJoule (mJ)  |  Watt seconds (W_s)  |  Newton Meter (N_m)  |  killiwatt hour (kWh)  |  Electron Volt (eV)  |  hartree (hartree)  |  Erg (erg)  |  Calorie (cal)  |  British Thermal Unit (BTU)

Permeability

Darcy (d)  |  milliDarcy (md)  |  microDarcy (`mu`d)

radians/second2 (rad/ sec2)  |  radians/hour2 (rad/h2)  |  radians/min2 (rad/min2)  |  degrees/hour2 (o/h2)    degrees/min2 (o/min2)  |  degrees/sec (o/s2)  |  revolutions/second (rev/s)  |  revolutions/minute (rpm) | 

Enthalpy

Joule/mole (J/mol)  |  kJoule/mole (kJ/mol)  |  British Thermal Unit/mole (BTU/mol)  |  Electron Volt/mole  (eV/mol)  |  Erg/mole (erg/mol)

Power

Watt (W)  |  milliWatt (mW)  |  killiWatt (kW)  |  British Thermal Unit/Hour (BTU/h)  |  horsepower (hp)

rad/sec (rad/s)  |  radians/day (rad/day)  | radians/hour (rad/h)  |  radians/minute (rad/min)  |  degrees/day (o/day)  | 

Fluid Resistance

Pascal-second/Liter (pa*s/L)  |  Pascal-minute/Liter (pa*min/L)  |  Pascal-second/milliliter (pa*s/mL)  |  Pascal-minute/milliliter (pa*min/mL)  |  Pascal-second/cubic meter (pa*s/m3)  |  Pascal-minute/cubic meter (pa*min/m3)  |   Pascal-second/cubic cemnntimeter (pa*s/cm3)  |  Pascal-minute/cubic centimeter (pa*min/cm3)  |  Millimeter Mercury-second/Liter (mmHg*s/L)  |  Millimeter Mercury-minute/Liter (mmHg*min/L)  |  Millimeter Mercury-second/milliliter (mmHg*s/mL)  |  Millimeter Mercury-minute/milliliter (mmHg*min/mL)    |  Millimeter Mercury-second/cubic centimeter(mmHg*s/cm3)  |  Millimeter Mercury-minute/cubic centimeter (mmHg*min/cm3

Pascal (Pa)  |  milliPascal (mPa)  |  killiPascal (kPa)  |  megaPascal (MPa)  | millimeter of Mercury (mmHg)  |  inch of Mercury (inHg)  |  Bar (bar)  |  millibar (mbar)  |  Newton/millimeter2 (N/mm2)  |  Newton/centimeter2 (N/cm2)  Pounds/inch2 (PSI)  |  Torr (Torr)
steradians (str)  | sphere (sphere)

Force

Newton (N)  |  Dyne (dyn)  |  kilogram Force (kgf)  |  Pound Force (lbf)  |  Tonne Force (tonne_force)  |  Short Ton Force (short_ton_force)  |  Long Ton Force (long_ton_force)

Radiation Dose Absorbed

Gray (Gy)  |  Sievert (Sv)  |  Rad (rd)  |  Roentgen Equivalent Man (rem)  |  Banana Equivalent Dose (BED)

Area

Meter2 (m2)  |   Micrometer2 (`mu`m2)  |  Millimeter2 (mm2)  |  Centimeter2 (cm2)  |  Kilometer2 (km2)  |  Inch2 (in2)  |  Foot2 (ft2)  |  Yard2 (yd2)  |  Mile2 (mi2)  |  Acre (acre)  |  Are (a)  |  Hectare (ha)  

Frequency

Hertz (Hz)  |  killihertz (kHz)  |  Megahertz (MHz)  |  Gigahertz (GHz)  |  Per Second (perSec)  |  Per Minute (perMin)  |  Per Hour (perHr)  |  Per Day (perDay)  |  Per Week (perWk)  |  Per Year (perYr)  | Beats Per Minute (BPM)  |  Drops Per Minute (drop/min)

Radiation Dose Effective

Gray (Gy)  |  Sievert (Sv)  |  Rad (rd)  |  Roentgen Equivalent Man (rem)  |  Banana Equivalent Dose (BED)

Concentration

Mole/Meter3 (mol/m3)  |  Mole/Liter (mol/L)

Illuminance

Lux (lx)  |  Lambert (La)

Becquerel (Bq)  |  Curie (Ci)

Data Volume 

Bit (bit)  |  Byte (byte)  |  Kilobyte (KB)  |  Megabyte (MB)  |  Gigabyte (GB)  |  Terabyte (TB)  |  PetaByte (PB)

Length

Meter (m)  |  Nanometer (nm)  |  Millimeter (mm)  |  Centimeter (cm)  |  Kilometer (km)  |  Inch (in)  |  Foot (ft)  | Yard (yd)  |  Mile (mi)  |  Nautical Mile (nmi)  |  Angstrom  ()  |   Mil (mil)  |  Pixel (pixel)  |  Point (pt)  |  US Survey Foot (foot_survey_us)  |  Fathom (fathom)  |  Astronomical Unit (ua)  |  Light Second (light_second)  |  Light Minute (light_minute)  Light Hour (light_hour)  |  Light Day (light_day)  |  Light Year (ly)  | Kilo-Light Year (kly)  |  Parsec (pc)  |  Megaparsec (Mpc)

Stress

Newtons/Centimeter2 (N/cm2) |  Kilonewtons/Centimer2 (kN/cm2)  | Newton/Millimeter2 (N/mm2)  |  Kilonewton/Millmeter2 (kN/mm2)  |  Pounds/Inch2 (psi_stress)  |  Pound Force/Foot2 (lbf/ft2)  |  Short Ton Force/Inch2 (short_ton_force/in2)  |  Short Ton Force/Foot2 (short_ton_force/ft2)  |  Long Ton Force/Inch2 (long_ton_force/in2)  |  Long Ton Force/Foot2 (long_ton_force/ft2)

Data Rate

Bit/Second (bit/s)  |  Bit/Minute (bit/min)  | Bit/Hour (bit/h)  |  Bit/Day (bit/day)  |  Byte/Second (byte/s)  |  Byte/Minute (byte/min)  | Byte/Hour (byte/h)  |  Byte/Day (byte/day)  |  Kilobyte/Second (KB/s)  |  Kilobyte/Minute (KB/min)  |  Kilobyte/Hour (KB/h)  |  Kilobyte/Day (KB/day)  |  Megabyte/Second (MB/s)  |  Megabyte/Minute (MB/min)  |  Megabyte/Hour (MB/h)  |  Megabyte/Day (MB/day)  |   Gigabyte/Second (GB/s)  |  Gigabyte/Minute (GB/min)  |  Gigabyte/Hour (GB/h)  |  Gigabyte/Day (GB/day)  |  Terabyte/Second (TB/s)  |  Terabyte/Minute (TB/min)  |  Terabyte/Hour (TB/h)  |  Terabyte/Day (TB/day)  |   Petabyte/Second (PB/s)  |  Petabyte/Minute (PB/min)  |  Petabyte/Hour (PB/h)  |  Petabyte/Day (PB/day)  | 

Magnetic Flux

Weber (Wb)  |  Maxwell (Mx)

Surface Energy

Newton/Meter (N/m)  |  Pound Force/Inch (lbf/in)  |  Pound Force/Foot (lbf/ft)

Dimensionless
Real  |   Percentage (%) |  Decibel (dB)

Magnetic Flux Density

Tesla (T)  | Gauss (G)

Temperature

Kelvin Degrees (kelvin)  |  Degrees Centigrade (oC)  Degrees Fahrenheit (oF)  |  Degrees Rankine  (oR)

Duration (Time)

Second (s)  |  Nanosecond (ns)  |  Microsecond (`mu`s)  |  Millisecond (ms)  |  Minute (min)  |  Hour (h)  |  Day (day)  |  Week (week)  |  Month (month)  |  Year (year)  |  Decade (decade)  |  Century (century)  |  Sidereal Day  (day_sidereal)  |  Calendar Year (year_calendar)  |  Sidereal Year (year_sidereal)

Mass

Kilogram (kg)  |  Milligram (mg)  |  Gram (g)  |  Ounce (oz)  |  Pound (lb)  |  US Ton (ton_us)  |  Metric Ton/Meter3 (t/m3)  |  UL Ton (ton_ul) 

Torque

Joules (J) |  Foot Pound Force (ft_lbf)   |  Millijoules (mJ)  |  Watt Seconds (W_s)  |  Newton Meter (N_m)  |  Killiwatt Hour (kWh)  |  Electron Volt (eV)  |  Hartree (hartree)  |  Erg  (erg)  |  Calorie (cal)  |  British Thermal Unit (BTU)

Dynamic Viscosity

Kilogram/Meter`*`Second (kg/(m`*`s)

Mass Flow Rate

Kilogram/Second (kg/s)  |  Kilogram/Minute (kg/min)  |  Kilogram/Hour (kg/h)  |   Gram/Second (g/s)  |  Pound/Second (lb/s)  |  Pound/Minute (lb/min)  |  Pound/Hour (lb/h)

Velocity

Meters/Second (m/s)  |  Centimeters/Second (cm/s)  |  Kilometers/Second (km/s)  |  Kilometers/Minute (km/min)  |  Kilometers/Hour (km/h)  |  Miles/Hour (mph)  |  Inch/Second (in/s)  |  Inch/Minute (in/min)  |  Foot/Second (ft/s)  |  Foot/Minute (ft/min)  |  Foot/Hour (ft/h)  |  Knot (kn)  |  Mach (Mach)  |  Speed of Light (c)


Electric Capacitance

Farad (F)  |  Picofarad (pF)  |  Microfarad (`mu`F)  |  Millifarad (mF)  Kilofarad (kF)

Molar Mass

Gram/Mole (g/mol)  |  Kilogram/Mole (kg/mol)  |  Kilogram/Kilomole (kg/kmol)  |  Milligram/Mole (mg/mol)  |  Ounce/Mole (oz/mol)  |  Pound/Mole (lb/mol)

Volume

Meter3 (m3)  |  Millimeter3 (mm3)  |  Centimeter3 (cm3)  |  Milliliter (mL)  |  Liter (L)  |  Kilometer3 (km3)  |  Inch3 (in3)  |  Foot3 (ft3)  |  Yard3 (yd3)  |  Mile3 (mi3)  |  UK Liquid Ounce (oz_liquid_uk)  |  US Liquid Ounce  oz_liquid)  |  Gallon (gal)  |   US Dry Gallon (gallon_dry_us)  | British Gallon (gallon_uk)  |  Bushel (bu)  |  Smidgen (smidgen)  |  Pinch (pinch)  |  Dash (dash)  |  Teaspoon (tsp)  |  Tablespoon (tbsp)  |  Cup (cup)  |  US Pint  (pint)  |   US Quart (qt)  |  Barrel (bbl) 


Electric Charge

Coulomb (C)  |  Kilocoulomb (kC)  |  Millicoulomb (mC)  |  Microcoulomb (`mu`C)  |  Picocoulomb (pC)  |  Faraday (Fd)  |  Elementary Charge (e)  |  Franklin (Fr)

Moment of Inertia

Kilogram*Meter2 (kg*m2)  |  Gram `*` Meter2  (g/m2)  |  Pound/Foot2 (lb/ft2)  |  Ounce/Inch2 (oz/in2)

Volumetric Density

Kilogram/Meter3 (kg/m3)  |  Pound/Feet3 (lb/ft3)  |  Gram/Centimeter3 (g/cm3)  |  (t/m3)  |  US Ton/Yard3 (ton_us/yd3)  |  Ounce/Inch3 (oz/in3)

Electric Current

Amperes (A) |  | Milliamps (mA)  |  Microamps (`mu`A)  |  nanoamps (nA)  |  (Gi)

Money

US Dollar (USD)  |  Australian Dollar (AUD)  |  Brazillian Real (BRL)  |  Canadian Dollar (CAD)  |  Swiss Frank (CHF)  |  Chinese Yuan Renminbi (CNY)  | Euros (EUR)  |  British Pound (GBP)  |  Indian Rupee (INR)  |  Japanese Yen (JPY)  |  Mexican Peso (MXN)  |  Russian Ruble (RUB)  |  South African Rand (ZAR)

Volumetric Flow Rate

Meter3/Second (m3/s)  | Liter/Second (L/s)  |  Liter/Minute (L/min)  |  Liter/Hour (L/h)  |  Milliliter/Second (mL/s)  |  Milliliter/Minute (mL/min)  |  Milliliter/Hour (mL/h)  |  Quart/Second (qt/s)  |  Quart/Minute (qt/min)  |  Quart/Hour (qt/h)  |  Gallon/Second (gal/s)  |  Gallon/Minute (gal/min)  |  Gallon/Hour (gal/h)  |  Barrel/Minute (bbl/min)  |  Barrel/Hour (bbl/h)  |  Barrel/Day (bbl/day)  |  Feet3/Minute (ft3/min)  |  Feet3/Hour (ft3/h)  |  Feet3/Day (ft3/day)

Electric Field

Newtons/Coulomb (N/C)  |  Kilogram Force/Coulomb (kgf/C)  |  Pound Force/Coulomb (lbf/C)  |  Volts/Meter (V/m)  |  Volts/Feet (V/ft)  |  Volts/Inch (V/in)

Money Per Area

US Dollars/Inch2 (USD/in2)  |  US Dollars/Feet2 (USD/ft2)  |  US Dollars/Yard2 (USD/yd2)  |  US Dollars/Mile2 (USD/mi2)  |  Euro/Centimeter2 (EUR/cm2)  |  Euro/Meter2 (EUR/m2)  |  Euro/Kilometer2 (EUR/km2)  |  British Pound/Centimeter2 (GBP/cm2)  |  British Pound/Meter2 (GBP/m2)  |  British Pound/Kilometer2 (GBP/km2)  |  Japanese Yen/Centimeter2 (JPY/cm2)  |  Japanese Yen/Meter2 (JPY/m2)  |  Japanese Yen/Kilometer2 (JPY/km2)  |  Indian Rupee/Centimeter2 (INR/cm2)  |  Indian Rupee/Meter2 (INR/m2)  |  Indian Rupee/Kilometer2 (INR/km2)  |   Chinese yuan renminbi/Centimeter2 (CNY/cm2)  |  Chinese yuan renminbi/Meter2 (CNY/m2)  |  Chinese yuan renminbi/Kilometer2 (CNY/km2)  |


Electric Inductance

 Henry (H)  |  Millihenry (mH)  |  Nanohenry (nH)

Money Per Length

US Dollars/Inch (USD/in)  |  US Dollars/Foot (USD/ft)  |  US Dollars/Mile (USD/mi)  |  Euros/Centimeter (EUR/cm)  |  Euros/Meter (EUR/m)  |  Euros/Kilometer (EUR/km)  |  British Pounds/Centimeter (GBP/cm)  |  British Pounds/Meter (GBP/m)  |  British Pounds/Kilometer (GBP/km)  |    Japanese Yen/Centimeter (EUR/cm)  |  Japanese Yen/Meter (EUR/m)  |  Japanese Yen/Kilometer (EUR/km)  |  Indian Rupee/Centimeter (INR/cm)  |  Indian Rupee/Meter (INR/m)  |  Indian Rupee/Kilometer (INR/km)  |  Chinese yuan renminbi/Centimeter (CNY/cm)  |  Chinese yuan renminbi/Meter (CNY/m)  |  Chinese yuan renminbi/Kilometer (CNY/km)  | 


Base Units

See the Base Units Collection

Derived Units

See the Derived Units page

Chinese yuan renminbi

Chinese yuan renminbi

Chinese yuan renminbi

Chinese yuan renminbi