The Metric System The International System of Units is a modernized version of the metric system, established by international agreement that provides a logical and interconnected framework for all measurements in science, industry, and commerce.
The system is built on a foundation of seven basic units, and all other units are derived from them.
Length Meter
Equal to the distance traveled by light in a vacuum in 1/299,792,458 of a second.
Time Second
Defined as the duration of 9,192,631,770 cycles of the radiation associated with a specified transition of the cesium 133 atom.
Mass Kilogram
The standard for the kilogram is a cylinder of platinum-iridium alloy kept by the International Bureau of Weights and Measures at Paris.
A duplicate at the National Bureau of Standards serves as the mass standard for the U. S.
The kilogram is the only base unit still defined by a physical object.
Temperature Kelvin
Defined as the fraction 1/273.16 of the thermodynamic temperature of the triple point of water; that is, the point at which water forms an interface of solid, liquid, and vapor.
This is defined at 0.01 degrees Celsius, or 32.02 degrees Farenheit. Zero degrees K is called absolute zero.
Electric Current The ampere is defined as that current that, if maintained in each of two long, parallel wires seperated by one meter in free space, would produce a force between the two wires (due to their magnetic fields) of 2 x 10-7 newton for each meter of length.
(A newton is the unit of force that when applied to one kg mass would experience an acceleration of one meter per second per second.)
Luminous Intensity Candela
Defined as the luminous intensity of 1/600,000 of a square meter of a cavity at the temperature of freezing platinum, 2,042K.
Amount of Substance Mole
The mole is the amount of substance of a system that contains as many elementary particles as there are atoms in .012 kg of carbon-12.

Metric Units

Length
UnitKilometerHectometerDeckameter MeterDecimeterCentimeterMillimeter
Symbol 1 km = 1 hm = 1 dam = 1 m = 1 dm = 1 cm = 1 mm =
Base Unit Value 1000 m 100 m 10 m 1 m 0.1 m 0.01 m 0.001 m
Area
UnitKilometer HectometerDeckameterMeter DecimeterCentimeterMillimeter
Symbol 1 sq. km = 1 sq. hm = 1 sq. dam = 1 sq. m = 1 sq. dm = 1 sq. cm = 1 sq. mm =
Base Unit Value 1 000 000 sq.m 10 000 sq. m 100 sq. m 1 sq. m 0.01 m 0.0001 m 0.000001 m
Liquid Volume
Unit KiloliterHectoliterDeckaliterLiter DeciliterCentiliterMilliliter
Symbol 1 kL = 1 hL = 1 daL = 1 L = 1 dL = 1 cL = 1 mL =
Base Unit Value 1000 L 100 L 10 L 1 L 0.1 L 0.01 L 0.001 L
Weight (Mass)
UnitKilogram HectogramDeckagramrGramDecigram CentigramMilligram
Symbol 1 kg = 1 hg = 1 dag = 1 g = 1 dg = 1 cg = 1 mg =
Base Unit Value 1000 g 100 g 10 g 1 g 0.1 g 0.01 g 0.001 g

Conversions

Length
TO CONVERT FROMTO MULTIPLY BY
inches millimeters25.4
inchescentimeters2.54
inchesmeters .0254
feet meters.304
yardsmeters.914
mileskilometers 1.609
millimeters inches.039
centimetersinches .39
meters inches 39.37
meters feet3.28
metersyards1.09
kilometersmiles .62
Area
TO CONVERT FROMTOMULTIPLY BY
sq. in.sq. cm 6.451
sq. ft. sq. m.092
sq. yds.sq m.8
sq. misq. km 2.6
sq. cm sq. in..155
sq. msq. ft.10.763
sq. msq. yd. 1.2
sq. km sq. mi.3861
Mass (Weight)
TO CONVERT FROMTO MULTIPLY BY
ounces grams28.35
poundskg.453
tonskg907.2
gramsoz. .035
kg lbs.2.205
tonslbs.2205
Volume
TO CONVERT FROMTOMULTIPLY BY
cubic inches cubic centimeters16.387
cu. ydcu. meter .764
fl. oz. ml(cc)29.574
fl. oz.liters..029
pintsliters .473
quarts liters.946
gallonsliters3.785
cccu. in. .061
cu. m cu. yd.1.308
litersfl. oz.33.814
literspints 2.113
liters quarts1.056
litersgallons.264
Temperature Celsius = (Fahrenheit - 32)(5/9)
Kelvin = Celsius + 273.16
Fahrenheit = Celsius(9/5) + 32
km/liter kilometers per liter = miles per gallon(.4251)