Imperial and Metric Units' Online Conversion

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Conversion of currency units  Conversion of cooking units  Conversion of apothecary units  Conversion of league units  Conversion related to Internet reach statistics  Conversion of ancient Roman units  Conversion of ancient Greek units   


Area Units
Area
Energy Units
Energy
Flowrate Units
Flow rate
Force Units
Force
Length Units
Length
Mass Units
Mass
Power Units
Power
Pressure Units
Pressure
Temperature Units
Temperature
Velocity Units
Velocity
Volume Units
Volume
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* Parameters, SI and Legacy units and symbols

* Click here for the units' list in categorical order


 

 

 

 

 

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Energy

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  Online converter of imperial and metric units - What is a metre (meter)?

A metre (symbol: m), or meter, is the unit of length at the base of the International System of Units (SI).  The French Academy of Sciences was the first institution to officially define the length of a metre. In 1983, a new definition replaced the previous one.  Since then, a metre is the equivalent of the distance light travels in free space in 1 / 299,792,458 of a second.

 
  What is a yard?

A yard (symbol: yd) is a length unit used in the English, Imperial and U.S. customary units' systems.  It is the equivalent of 0.9144 metre in the International System (SI), 36 inches in the Imperial System and 3 feet in the U.S. Customary System.

 
 

What is the proper appellation of the "Système international d'unités" in other languages?  Must we always use the French appellation?

The French abbreviation for the "Système international" is SI.  Hence, SI is the universal abbreviated form of this particular system. 
* Show SI in other languages / Hide

 

 

What are the Metric System prefixes?

The Metric System prefixes are:

 
Prefix Abbr. Meaning

deka

da

10

hecto

h

100

kilo

k

1000

mega

M

106 (million)

giga

G

109 (billion)

tera

T

1012 (trillion)

peta

P

1015 (quadrillion)

exa

E

1018 (quintillion)

zetta

Z

1021 (sextillion)

yotta

Y

1024 (septillion)

deci

d

1/10

centi

c

1/100

milli

m

1/1000

micro

µ

1/106

nano

n

1/109

pico

p

1/1012

femto

f

1/1015

atto

a

1/1018

zepto

z

1/1021

yocto

y

1/1024

 
 

Height conversion: feet and inches to centimeters (i.e.: 5'8'' or 5 ft 8 in to cm)...

 

metric ruler

Feet and inches Centimeters
   
4 feet 0 inch 121.92 cm
4 feet 1 inch 124.46 cm
4 feet 2 inches 127.00 cm
4 feet 3 inches 129.54 cm
4 feet 4 inches 132.08 cm
4 feet 5 inches 134.62 cm
4 feet 6 inches 137.16 cm
4 feet 7 inches 139.70 cm
4 feet 8 inches 142.24 cm
4 feet 9 inches 144.78 cm
4 feet 10 inches 147.32 cm
4 feet 11 inches 149.86 cm
5 feet 0 inch 152.40 cm
5 feet 1 inch 154.94 cm
5 feet 2 inches 157.48 cm
5 feet 3 inches 160.02 cm
5 feet 4 inches 162.56 cm
5 feet 5 inches 165.10 cm
5 feet 6 inches 167.64 cm
5 feet 7 inches 170.18 cm
5 feet 8 inches 172.72 cm
5 feet 9 inches 175.26 cm
5 feet 10 inches 177.80 cm
5 feet 11 inches 180.34 cm
6 feet 0 inch 182.88 cm
6 feet 1 inch 185.42 cm
6 feet 2 inches 187.96 cm
6 feet 3 inches 190.50 cm
6 feet 4 inches 193.04 cm
6 feet 5 inches 195.58 cm
6 feet 6 inches 198.12 cm
6 feet 7 inches 200.66 cm
6 feet 8 inches 203.20 cm
 
 

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Worldwide use of the Metric System and Date of Metrication

* The United States of America, Burma and Liberia have not yet adopted the Metric System (SI).
 

Metrication per country

Year of metrication per country

  1795  France

1820  Belgium, Luxembourg

  Netherlands

1840  Algeria

1853  Colombia, Monaco

1858  Cuba, Spain

1862  Brazil, Mexico

1863  Italy, Uruguay

1865  Chile, Ecuador

1868  Peru, Puerto Rico

1871  Austria, Liechtenstein

1872  Germany, Portugal

1875  Norway, Czechoslovakia

1876  Sweden, Switzerland

  Hungary, Yugoslavia

1878  Mauritius, Seychelles

1884  El Salvador, Romania

1886  Argentina, Finland

1891  Bolivia, Bulgaria

1893  Nicaragua, Tunisia

1900  Iceland, Paraguay

1908  Denmark, Costa Rica

1910  Burundi, Rwanda, Zaire

1911  Honduras

1912  Dominican Republic

1915  Guatemala, San Marino

  Panama, Venezuela

1916  Philippines, Surinam

1918  Poland, Mongolia

1920  Haiti, Malta

1922  Cambodia, Morocco

1923  Afghanistan, Libya

1925  Russia, China

1927  Iran

1930  Iraq, Turkey

1934  Lebanon, Syria

1946  Indonesia, Thailand

1948  Albania, Korea, Israel

1952  Jordan, Taiwan

1954  India, Sudan

1957  Japan, Greece

1959  Ivory Coast, Guinea

1960  Chad, Gabon

 

Central African Republic, Mali

 

Malagasy Republic, Dahomey

 

Mauritania, Niger, Senegal 

 

Togo, Burkina Faso, Somalia

 

Congo People's Republic

1961  Cameroon, U.A.R.

1962  Ethiopia, Nigeria

1963  Laos, Vietnam

1964  Saudi Arabia

1965  Britain

1967  Ireland, Pakistan, Kenya

  Uganda, Tanzania

1968  South Africa

1969  Australia, New Zealand

1970  Canada, Quebec

1998  Jamaica

 

Conversion Table

U.S. unit Metric equivalent
Metric unit U.S. equivalent
 

Inch (in)

Centimeter (cm)

2.54 centimeters

0.394 inch

Foot (ft)

Meter (m)

0.305 meter

3.28 feet

Yard (yd)

Meter (m)

0.914 meter

1.09 yard

Mile (mi)

Kilometer (km)

1.61 kilometer

0.621 mile

Square inch (in2)

Square centimeter (cm2)

6.45 square centimeters (cm2)

0.155 square inch (in2)

Square foot (ft2)

Square meter (m2)

0.093 square meter (m2)

10.8 square feet (ft2)

Square yard (yd2)

Square meter (m2)

0.836 square meter (m2)

1.2 square yard (yd2)

Square mile (mi2)

Square kilometer (km2)

2.56 square kilometers (km2)

0.386 square mile (mi2)

Acre

Hectare (ha)

0.405 hectare

2.47 acres

Cubic foot (ft3)

Cubic meter (m3)

0.028 cubic meter (m3)

35.28 cubic feet (ft3)

Quart (qt)

Liter (l)

0.946 liter

1.06 quart

Gallon

Cubic inch (in3)

231 cubic inches (in3)

0.0043 gallon

Ounce (oz)

Gram (g)

28.3 grams

0.035 ounce

Pound (lb)

Kilogram (kg)

0.454 kilogram

2.2 pounds


Units per conversion type
Area
  • square meter (m2)
  • are (a) = 100 sq. meters (m2)
  • hectare (ha) = 100 Ares = 10 000 sq. meters
  • square kilometer (km2) = 100 hectares = 10000 Ares = 1 000 000 sq. meters
  • square mega meter (Mm2) = 1 000 000 000 000 sq. meters
  • square foot = 144 sq. inches = 0.09290304 sq. meters
  • square yard = 9 sq. feet = 0.83612736 sq. meters
  • square perch = 30.25 sq. yards = 25.2928526 sq. meters
  • acre = 10 sq. chains = one furlong by one chain = 160 sq. perches = 4840 sq. yards = 43 560 sq. feet = 4046.8564224 sq. meters
  • square mile = 640 acres = 2.589988110336 sq. kilometers

Metric System Imperial
1 square centimeter [cm2] 100 square millimeters 0.001076391 square feet
1 square meter [m2] 10000 square centimeters 1.19599004630 square yard
1 hectare [ha] 10000 square meters 2.47105381467 acres
1 square kilometer [km2] 100 hectares 0.38610215854 square mile

Imperial Metric System
1 square inch [in2] 6.4516 square centimeters
1 square foot [ft2] 144 square inches 0.09290303999 square meter
1 square yard [yd2] 9 square feet 0.83612736 square meter
1 acre 4840 square yards 4046.8564224 square meters
1 square mile 640 acres 2.589988110336 square kilometers


Length

Main length units:
  • meter
  • centimeter
  • kilometer
  • inch
  • foot
  • yard
  • mile
  • light-year (astronomical unit)
  • parsec (astronomical unit)
  • angstrom (microscopic unit)

Metric System Imperial
1 millimeter [mm] 0.03937007874 inch
1 centimeter [cm] 10 millimeters 0.3937007874 inch
1 meter [m] 100 centimeters 1.09361329833 yard
1 kilometer [km] 1000 meters 0.62137119223 mile

Imperial Metric System
1 inch [in] 2.54 centimeters
1 foot [ft] 12 inches 0.3048 meter
1 yard [yd] 3 feet 0.9144 meter
1 mile 1760 yards 1.609344 kilometer


Weight and Mass

Main weight units:
  • gram (g) = 11000 kg
  • kilogram (kg)
  • tonne (t)= 1 000 kg
  • electronvolt (eV)
  • atomic mass unit (u)
  • slug (sl)
  • pound (lb)
  • Planck mass (mP)
  • solar mass (M)
  • Compton wavelength
  • Schwarzschild radius

Metric System Imperial
1 milligram [mg] 0.01543209876 grain
1 gram [g] 1000 milligrams 0.03527399072 ounce
1 kilogram [kg] 1000 grams 2.20458553791 pounds
1 tonne [t] 1000 kilograms 0.98418997228 ton

Imperial Metric System
1 ounce [oz] 437.4922839506173 grains 28.3495 grams
1 pound [lb] 16 ounces 0.4536 kilogram
1 stone 14 pounds 6.35 kilograms
1 hundredweight [cwt] 112 pounds 50.8032 kilograms
1 ton 20 hundredweights 1.016064 tonne


Volume

Main volume units:
  • cubic inch (cu in) or (in3)
  • cubic foot (cu ft) or (ft3)
  • cubic yard (cu yd) or (yd3)
  • acre foot (acre ft)
  • minim (min)
  • US fluid dram (fl dr)
  • teaspoon (tsp)
  • tablespoon (Tbsp)
  • US fluid ounce (fl oz)
  • jigger (jig)
  • US gill (gi)
  • US cup (cp)
  • US pint (pt)
  • US quart (qt)
  • US gallon (gal)
  • barrel (bbl)
  • hogshead
  • pint (pt)
  • quart (qt)
  • gallon (gal)
  • peck (pk)
  • bushel (bu)
  • fluid ounce (fl oz)
  • gill

Metric System Imperial
1 cubic centimeter [cm3] 0.06102361003 cubic inch
1 cubic decimeter [dm3] 1000 cubic centimeters 0.03531458914 cubic foot
1 cubic meter [m3] 1000 cubic decimeters 1.30794774594 cubic yard
1 liter [l] 1 cubic decimeter 1.75975011548 pint
1 hectoliter [hl] 100 liters 21.9968764435 gallons

Imperial Metric System
1 cubic inch [in3] 16.3871 cubic centimeters
1 cubic foot [ft3] 1728 cubic inch 0.0283169088 cubic meter
1 fluid ounce [fl oz] 28.413125 milliliters
1 pint [pt] 20 fluid ounces 0.5682625 liter
1 gallon [gal] 8 pints 4.5461 liters


Energy

Main energy units:
  • ergs
  • calories
  • joule
  • kilowatt hour = 3.6 million joules
  • British thermal unit (BTU) = 1055 joules (approx.)


Flow rate

Definition: volume of fluid passing through a particular surface per unit time (i.e.: cubic meters per minute or cubic feet per minute).

Symbol: Q.

Also know as:

  • volumetric flow rate
  • volume flow rate
  • rate of fluid flow


Force

Force units:
  • Newton
  • dyne
  • kilogram-force
  • pound-force
  • poundal


Power

Main power units:
  • watt (W) = 1 joule per second
  • ergs per second (erg/s)
  • horsepower (hp) = 33 000 foot-pounds per minute = 746 watts
  • metric horsepower [Pferdestärke (PS) or cheval vapeur (CV)]
  • foot-pounds per minute
  • dBm
  • calories per hour
  • kilocalories per hour
  • Btu per hour (Btu/h)
  • tons of refrigeration = 12 000 Btu/h


Pressure

Main pressure units:
  • Pascal (Pa) = one Newton per square meter
  • pound per square inch (psi)
  • bar
  • barye (ba) = dyne per square centimeter
  • hectoPascal (hPa)
  • kiloPascal (kPa)
  • millibar (mbar)
  • inch of mercury (inHg)
  • decibar (dbar) = increase of 1 meter (depth)
  • rule of thumb (for scuba divers)
  • standard atmosphere (atm) = 101 325 Pa =        101.325 kPa = 1013.25 hPa
  • millimeters of mercury (mmHg) = one torr
  • inches of mercury
  • millimeter, centimeter, meter, inch, and foot of water
  • kip, ton-force (short), ton-force (long), pound-force, ounce-force, and poundal per square inch
  • kg-force, or kilopond, per square cm
  • gram-force and tonne-force (metric ton-force) per square cm
  • kg-force and tonne-force per square meter
  • sthene per square meter (pieze)

  • Temperature

    Main temperature units:
    • Kelvin (K)
    • Celsius
    • Fahrenheit
    • electronvolts (eV)= 11 605 K
    • kiloelectronvolts (keV)
    • Rankine


    Velocity

    Main velocity units:
    • Meters per second (m s−1 or m/s)
    • Kilometers per hour (km/h)
    • Miles per hour (mph)
    • Knots (nautical miles per hour [kn or kt])
    • Feet per second (fps or ft/s)
    • Mach number = speed divided by the speed of sound
    • Speed of light in vacuum (c = 299 792 458 m/s)


     

     

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    Online Conversion of Metric (International System), Imperial, U.S. Customary, Monetary, Culinary and Historical Units / Conversion d'unités métriques (Système international, SI), impériales, américaines, monétaires, culinaires et historiques / Conversión métrica e imperial / 日本語 / Conversão de unidades métricas e imperiais / 計量單位 (变革) Umrechnung von metrischen und imperialen Einheiten / Конверсия метрических и английскими единицами измерения

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