# Measurement Conversion

[Area]   [Energy]   [Fuel Economy]   [Length]   [Power]   [Pressure]
[Temperature]   [Torque]   [Weights]   [Velocity]   [Volume]

## Area

SI (Metric)
Square kilometer (km2)
hectare (ha)
are (a)
Almost never used
Square meter (m2)
Square decimeter (dm2)
Almost never used
Square centimeter (cm2)
Square millimeter (mm2)
U.S. and Imperial Area Measure
Mile square (sq mi)
Acre
Square rod (sq rd)
Square yard (sq yd)
Square foot (sq ft)
Square inch (sq in)

## Energy

SI (Metric)
terawatthours (TWh)
gigawatthours (GWh)
megawatthours (MWh)
kilowatthours (kWh)
watthours (Wh)
gigajoule (GJ)
megajoule (MJ)
kilojoule (kJ)
joule (J = Ws)
millijoule (mJ)
U.S. and Imperial
Therm (therm = 100,000 BTU)
Slightly different definitions of BTU exist
British Thermal Unit (BTU)
Slightly different definitions of BTU exist

Other units
kilocalorie (kcal)
Called "Calorie" when working with food
calorie (cal)
Slightly different definitions of cal exist
erg

## Fuel Economy

SI (Metric)
liter per 100 km (l/100km)
Usually in Europe
liter per 10 km (l/10km)
Sometimes used
km per liter (km/l)
Perhaps used somewhere?
U.S.
miles per gallon (mpg)

Imperial
miles per gallon (mpg)

## Length

SI (Metric)
kilometer (km)
meter (m)
decimeter (dm)
Almost never used
centimeter (cm)
millimeter (mm)
micrometer (μm)

Nautical Length Measure
Nautical mile (nmi)
Fathom
U.S. and Imperial Length Measure
Mile (mi)
Furlong (fur)
Yard (yd)
Foot (ft)
Inch (in)
Mil [1/1000 inch]

Astronomy
Astronomic unit (ua)
Older symbol AU
Light-year (ly)
Parsec (pc)
From "parallax second"

## Power

SI (Metric)
terawatt (TW)
gigawatt (GW)
megawatt (MW)
kilowatt (kW)
watt (W = J/s)
milliwatt (mW)
U.S. and Imperial
Pound-foot per second (Lbft/s)
More correct: lbf.ft/s (pound force)
BTU per hour (BTU/h)
Slightly different definitions of BTU exist
BTU per second (BTU/s)
Slightly different definitions of BTU exist

Horsepower
Horsepower (hp)
US hp (550 lbf.ft/s)
Horsepower (hp)
"Metric" hp (735.5 W)

## Pressure

SI (Metric)
Bar (bar)
kilopascal (kPa)
hectopascal (hPa)
millibar (mbar)
Pascal (Pa = N/m2)
Atmosphere (atm)
Millimeters mercury (mm Hg = Torr)
U.S. and Imperial
Pound per square foot (lb/ft2)
More correct: lbf/ft2 (pound force)
Pound per square inch (lb/in2 = PSI)
More correct: lbf/in2 (pound force)
Inches mercury (in Hg)

Other pressure units
kg/cm2
Should be: kp/cm2 = kgf/cm2 = 9.80665 N/cm2
kg/m2
Should be: kp/m2 = kgf/m2 = 9.80665 Pa
The conversion factor 1 lb/in2 = 6894.757 Pa has been used.

## Temperature

SI (Metric)
Degrees Celcius (C)
kelvin (K)
U.S. and Imperial
Degrees Fahrenheit (F)

## Torque

SI (Metric)
kilonewtonmeter
newtonmeter (Nm = J = kgm2/s2)
millinewtonmeter
U.S. and Imperial
Foot-pound (Lbft)
More correct: lbf.ft (pound force)
Inch-pound (Lbin)
More correct: lbf.in (pound force)

Other units
kilogram-meter (kgm)
Should be: kpm or kgfm

## Weights

SI (Metric)
ton
kilogram (kg)
gram (g)
milligram (mg)
microgram (μg)

Troy weight (Precious metals and stones)
Troy pound (lb t)
Troy ounce (oz t)
PennyWeight (dwt)
Grain
Same as Avoirdupois grain
Avoirdupois weight
British ("long") ton
US ("short") ton
British ("long") hundredweight (cwt)
US ("short") hundredweight (cwt)
Stone
Pound (lb)
Ounce (oz)
Dram (dr)
Grain

## Velocity

SI (Metric)
kilometers per hour (km/h)
kilometers per second (km/s)
meters per second (m/s)

Nautial units
Knots (kt = nmi/h)
U.S./Imperial
Miles per hour (mph)
Feet per minute (ft/min)
Feet per second (ft/s)

Astronomy
Lightspeed (c)

## Volume

SI (Metric)
Cubic meter (m3)
hectoliter (hl)
Used when reporting wine production
dekaliter (dal)
Almost never used
Cubic dm (dm3) = liter (l)
deciliter (dl)
centiliter (cl)
Cubic cm (cm3)
= milliliter (ml)
Cubic millimeter (mm3)

U.S. Dry Measure
Barrel (bbl)
Bushel (bu)
Peck (pk)
Quart (qt)
Pint (pt)

British Imperial Liquid And Dry
Barrel
Bushel (bu)
Gallon (gal)
Pint (pt)
Fluid Ounce (fl oz)
"Metric Cooking Measure"
Table spoon
Tea spoon

U.S. Cooking Measure
Cup
Table spoon (Tbs)
Tea spoon (tsp)

U.S. Liquid Measure
Barrel [42 gal]
Other barrel sizes exist
Gallon (gal)
Quart (qt)
Pint (pt)
Gill (gi)
Fluid Ounce (fl oz)
Fluid dram (fl dr)
Minim (min)

U.S. and Imperial Cubic Measure
Acre foot
Cubic yard (yd3 = cu yd)
Cubic foot (ft3 = cu ft)
Cubic inch (in3 = cu in)