Select unit to convert Acres Ancient Greek Units Ancient Roman Units Apothecaries' System Ares Bars Barrels per day Baryes BTUs BTUs per hour BTUs per minute BTUs per second Degrees Celsius Centimeters (cm) Centimeters per second (cm/sec) Chains Crinals Cubic centimeters (cc) Cubic centimeters per second Cubic centimeters-atmosphere Cubic decimeters Cubic feet Cubic feet per minute Cubic feet per second Cubic inches Cubic inches per minute Cubic inches per second Cubic meters Cubic meters per hour Cubic yards Cubic yards per minute Decimeters (dm) Drams Dynes Ergs per second Degrees Fahrenheit Fluid drachmas Fluid ounces (fl.oz.) Feet (ft) Feet per hour Feet per minute Feet per second Foot-pound-forces (ft-lbf) Foot-pound-forces per hour Foot-pound-forces per minute Foot-pound-forces per second Furlongs Gallons Gallons per day Gallons per minute Gallons per second Gigawatts (GW) Gills Grains Grain-forces Grams (g) Gram-calories (g-cal) Hectares Hectometers Hundredweights (cwt) Inches (in) Inches H2O at 15.56 degrees Celsius Inches Hg at 15.56 degrees Celsius Inch-pound-forces (in-lbf) IST calories Joules (J) Joules per second (J/sec) Degrees Kelvin Kilocalories (kcal) Kilograms (kg) Kilogram-meters per square second Kilogram-calories Kilogram-forces (kgf) Kilogram-forces per square centimeter Kilogram-forces per square meter Kilometers (km) Kilometers per hour (km/h) KiloPascals (kPa) Kilowatts (kW) Kilowatts per hour (kWh) Kips Knots Liters (l) Liters per minute Liters per second Long tons (imperial tons) MegaPascals (mPa) Megawatts (MW) Meters (m) Meters per minute Meters per second Metric horsepower Miles Miles per hour (mph) Miles per minute Milligrams (mg) Milliliters (ml) Millimeters (mm) Miner inches Newtons Ounces (oz) Ounce-forces Pascals (Pa) Pints Pounds (lb) Pounds per square foot Pounds per square inch Poundals Poundals per square foot Poundals per square inch Pounds-CHU Pound-forces (lbf) Quarts Quarters Rods Short tons per square foot Slugs Square centimeters Square decimeters Square feet Square kilometers Square meters Square miles Square millimeters Square yards Stones Thermocalories Tons Tons (refrigeration) Tonnes (metric tons) Torrs U.S. gallons U.S. horsepower per hour U.S. pints U.S. tons Watts Watts per hour Yards ________________ Historical units / Other Ancient Greek Units Ancient Roman Units Apothecaries' System Internet Reach Stats ________________ Energy units American HP per hour to BTU American HP per hour to cc-atm American HP per hour to foot-pound force American HP per hour to Gcal American HP per hour to calorie (IST) American HP per hour to inch-pound force American HP per hour to joule American HP per hour to Kcal American HP per hour to kgcal American HP per hour to kWh American HP per hour to lb CHU American HP per hour to thermo calorie American HP per hour to Wh BTU to cc-atm BTU to foot-pound force BTU to Gcal BTU to calorie (IST) BTU to inch-pound force BTU to joule BTU to Kcal BTU to kgcal BTU to kWh BTU to lb CHU BTU to thermo calorie BTU to HP (US) per hour BTU to Wh cc-atm to BTU cc-atm to foot-pound force cc-atm to Gcal cc-atm to calorie (IST) cc-atm to inch-pound force cc-atm to joule cc-atm to Kcal cc-atm to kgcal cc-atm to kWh cc-atm to lb CHU cc-atm to thermo calorie cc-atm to HP (US) per hour cc-atm to Wh Foot-pound force to BTU Foot-pound force to cc-atm Foot-pound force to Gcal Foot-pound force to calorie (IST) Foot-pound force to inch-pound force Foot-pound force to joule Foot-pound force to Kcal Foot-pound force to kgcal Foot-pound force to kWh Foot-pound force to lb CHU Foot-pound force to thermo calorie Foot-pound force to HP (US) per hour Foot-pound force to Wh Gcal to BTU Gcal to cc-atm Gcal to foot-pound force Gcal to calorie (IST) Gcal to inch-pound force Gcal to joule Gcal to Kcal Gcal to kgcal Gcal to kWh Gcal to lb CHU Gcal to thermo calorie Gcal to HP (US) per hour Gcal to Wh Calorie (IST) to BTU Calorie (IST) to cc-atm Calorie (IST) to foot-pound force Calorie (IST) to Gcal Calorie (IST) to inch-pound force Calorie (IST) to joule Calorie (IST) to Kcal Calorie (IST) to kgcal Calorie (IST) to kWh Calorie (IST) to lb CHU Calorie (IST) to thermo calorie Calorie (IST) to HP (US) per hour Calorie (IST) to Wh Inch-pound force to BTU Inch-pound force to cc-atm Inch-pound force to foot-pound force Inch-pound force to Gcal Inch-pound force to calorie (IST) Inch-pound force to joule Inch-pound force to Kcal Inch-pound force to kgcal Inch-pound force to kWh Inch-pound force to lb CHU Inch-pound force to thermo calorie Inch-pound force to HP (US) per hour Inch-pound force to Wh Joule to BTU Joule to cc-atm Joule to foot-pound force Joule to Gcal Joule to calorie (IST) Joule to inch-pound force Joule to Kcal Joule to kgcal Joule to kWh Joule to lb CHU Joule to thermo calorie Joule to HP (US) per hour Joule to Wh kcal to BTU kcal to cc-atm kcal to foot-pound force kcal to Gcal kcal to calorie (IST) kcal to inch-pound force kcal to joule kcal to kgcal kcal to kWh kcal to lb CHU kcal to thermo calorie kcal to HP (US) per hour kcal to Wh kgcal to BTU kgcal to cc-atm kgcal to foot-pound force kgcal to Gcal kgcal to calorie (IST) kgcal to inch-pound force kgcal to joule kgcal to Kcal kgcal to kWh kgcal to lb CHU kgcal to thermo calorie kgcal to HP (US) per hour kgcal to Wh kWh to BTU kWh to cc-atm kWh to foot-pound force kWh to Gcal kWh to calorie (IST) kWh to inch-pound force kWh to joule kWh to Kcal kWh to kgcal kWh to lb CHU kWh to thermo calorie kWh to HP (US) per hour kWh to Wh lb CHU to BTU lb CHU to cc-atm lb CHU to foot-pound force lb CHU to Gcal lb CHU to calorie (IST) lb CHU to inch-pound force lb CHU to joule lb CHU to Kcal lb CHU to kgcal lb CHU to kWh lb CHU to thermo calorie lb CHU to HP (US) per hour lb CHU to Wh Thermo calorie to BTU Thermo calorie to cc-atm Thermo calorie to foot-pound force Thermo calorie to Gcal Thermo calorie to calorie (IST) Thermo calorie to inch-pound force Thermo calorie to joule Thermo calorie to Kcal Thermo calorie to kgcal Thermo calorie to kWh Thermo calorie to lb CHU Thermo calorie to HP (US) per hour Thermo calorie to Wh Wh to BTU Wh to cc-atm Wh to foot-pound force Wh to Gcal Wh to calorie (IST) Wh to inch-pound force Wh to joule Wh to Kcal Wh to kgcal Wh to kWh Wh to lb CHU Wh to thermo calorie Wh to HP (US) per hour

Click here for a popup calculator and here for the units' list in categorical order (Metric conversion / Imperial conversion [English units])         Weight Convert ton hundredweight (cwt) pound US ton quarter stone ounce dram grain tonne kilogram gram milligram In ton hundredweight (cwt) pound US ton quarter stone ounce dram grain tonne kilogram gram milligram   =   Length Convert mile furlong chain rod yard foot inch kilometer hectometer meter decimeter centimeter millimeter In mile furlong chain rod yard foot inch kilometer hectometer meter decimeter centimeter millimeter   = Volume Convert gallon quart pint gill fluid ounce fluid drachm US gallon US pint cubic yard cubic foot cubic inch cubic meter liter cubic decimeter cubic centimeter milliliter In gallon quart pint gill fluid ounce fluid drachm US gallon US pint cubic yard cubic foot cubic inch cubic meter liter cubic decimeter cubic centimeter milliliter   =   Area Convert square mile acre square yard square foot square kilometer hectare are square meter square decimeter square centimeter square millimeter In square mile acre square yard square foot square kilometer hectare are square meter square decimeter square centimeter square millimeter   = Velocity Convert mile per hour centimeter per second foot per hour foot per minute foot per second kilometer per hour knot meter per minute meter per second mile per minute In mile per hour centimeter per second foot per hour foot per minute foot per second kilometer per hour knot meter per minute meter per second mile per minute   =   Energy Convert British Thermal Unit (BTU) calorie (IST) calorie (thermo) cubic centimeter-atmosphere foot-pound-force gram-calorie US horsepower per hour inch-pound-force kilogram-calorie kilowatt per hour pound-CHU watt per hour joule kilocalorie In British Thermal Unit (BTU) calorie (IST) calorie (thermo) cubic centimeter-atmosphere foot-pound-force gram-calorie US horsepower per hour inch-pound-force kilogram-calorie kilowatt per hour pound-CHU watt per hour joule kilocalorie   = Force Convert Newton crinal dyne grain kilogram-force kilogram-meter per square second kip ounce-force pound-force poundal slug imperial ton (long ton) In Newton crinal dyne grain kilogram-force kilogram-meter per square second kip ounce-force pound-force poundal slug imperial ton (long ton)   =   Flowrate Convert gallon per minute barrel per day cubic centimeter per second cubic inch per second cubic inch per minute cubic foot per minute cubic foot per second cubic meter per hour cubic yard per minute gallon per day gallon per second liter per minute liter per second miner's inch In gallon per minute barrel per day cubic centimeter per second cubic inch per second cubic inch per minute cubic foot per minute cubic foot per second cubic meter per hour cubic yard per minute gallon per day gallon per second liter per minute liter per second miner's inch   = Power Convert watt BTU per hour BTU per minute BTU per second foot-pound-force per hour foot-pound-force per minute foot-pound-force per second gigawatt joule per second metric horsepower kilowatt megawatt ton (refrigeration) erg per second In watt BTU per hour BTU per minute BTU per second foot-pound-force per hour foot-pound-force per minute foot-pound-force per second gigawatt joule per second metric horsepower kilowatt megawatt ton (refrigeration) erg per second   =   Pressure Convert   pascal bar barye inch H2O (15.56 °C) inch Hg (15.56 °C) kilogram-force per square centimeter kilogram-force per square meter kilopascal megapascal pound per square foot pound per square inch poundal per square inch poundal per square foot short ton per square foot torr In pascal bar barye inch H2O (15.56 °C) inch Hg (15.56 °C) kilogram-force per square centimeter kilogram-force per square meter kilopascal megapascal pound per square foot pound per square inch poundal per square inch poundal per square foot short ton per square foot torr   = Temperature  Select  Conversion  Celsius  -->  Fahrenheit   Celsius  -->  Kelvin  Fahrenheit  -->  Celsius  Fahrenheit  -->  Kelvin  Kelvin  -->  Fahrenheit  Kelvin  -->  Celsius     Historical Units / Other types of conversion Ancient Greek Units Ancient Roman Units Apothecaries' System Internet Reach Conversion (# of visitors / % of global Internet users)

	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.  You can also use a translated appellation, if needed: Afrikaans internasionale eenheidstelsel Deutsch Internationales Einheitensystem English International System of Units Español Sistema Internacional de Unidades Esperanto Sistemo Internacia de Unuoj فارسی سیستم استاندارد بین ‌المللی واحدها 한국어 국제단위계 Íslenska Alþjóðlega einingakerfið Italiano Sistema internazionale di unità di misura עברית מערכת היחידות הבינלאומית Nederlands SI-stelsel 日本語 国際単位系 Polski Układ SI Português Sistema Internacional de Unidades Română Sistemul internaţional de unităţi Русский СИ Suomi Kansainvälinen yksikköjärjestelmä Türkçe M.K.S. (metre, kilogram, saniye) Українська Міжнародна система СІ 粵語 國際單位制 中文 国际单位制

	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

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Worldwide use of the Metric System and Date of Metrication

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

"The Proclamation regarding Weights and Measures A.D. 1556" by Ford Madox Brown Mural at Manchester Town Hall

Conversion Table  /  Table de conversion

Foot (ft) Meter (m)

.305 meter 3.28 feet

Yard (yd) Meter (m)

.914 meter 1.09 yard

Mile (mi) Kilometer (km)

1.61 kilometer .621 mile

Square inch (in2) Sq. centimeter (cm2)

6.45 sq. centimeters .155 square inch

Square foot (ft2) Square meter (m2)

.093 square meter 10.8 square feet

Square yard (yd2) Square meter (m2)

.836 square meter 1.2 square yard

Square mile (mi2) Square kilometer (km2)

2.56 square kilometers .386 square mile

Acre Hectare (ha)

.405 hectare 2.47 acres

Cubic foot (ft3) Cubic meter (m3)

.028 cubic meter 35.28 cubic feet

Quart, U.S. (qt) Liter (l)

.946 liter 1.06 quart, U.S.

Gallon, U.S. Cubic inch (in3)

231 cubic inches .0043 gallon, U.S.

Ounce (oz) Gram (g)

28.3 grams .035 ounce

Pound (lb) Kilogram (kg)

.454 kilogram 2.2 pounds

Area / Superficie

Length / Longueur

Volume

Energy

Flowrate

Force

Power

Pressure

Temperature

Velocity

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