Term	Symbol	Value
yotta	Y	1024
zetta	Z	1021
exa	E	1018
peta	P	1015
tera	T	1012
giga	G	109
mega	M	106
kilo	k	103
hecto	h	102
deka	da	101
deci	d	10-1
centi	c	10-2
milli	m	10-3
micro	μ	10-4
nano	n	10-9
pico	p	10-12
femto	f	10-15
atto	a	10-18
zepto	z	10-21
yocto	y	10-24

Units of Length

Units	Measurement
10 millimeters (mm) =	1 centimeter (cm)
10 centimeters =	1 decimeter (dm)
10 decimeters =	1 meter (m)
10 meters =	1 dekameter
10 dekameters =	1 hectometer
10 hectometers =	1 kilometer

Units of Area

Units	Measurement
100 square millimeters (mm2) =	1 square centimeter (cm2)
100 square centimeters =	square decimeter (dm2)
100 square decimeters =	quare meter (m2)
100 square meters =	1 square dekameter (dam2)
100 square dekameters =	1 square hectometer (hm2)
100 square hectometers =	1 square kilometer (km2)

Units of Liquid Volume

Units	Measurement
10 milliliters (mL) =	1 centiliter (cL)
10 centiliters =	1 deciliter (dL) = 100 milliliters
10 deciliters =	1 liter1 = 1000 milliliters
10 liters =	1 dekaliter (daL)
10 dekaliters =	1 hectoliter (hL) = 100 liters
10 hectoliters =	1 kiloliter (kL) = 1000 liters

Units of Volume

Units	Measurement
1000 cubic millimeters (mm3) =	1 cubic centimeter (cm3)
1000 cubic centimeters =	1 cubic decimeter (dm3)
1000 cubic decimeters =	1 cubic meter (m3)

Units of Mass

Units	Measurement
10 milligrams (mg) =	1 centigram (cg)
10 centigrams =	1 decigram (dg)
10 decigrams =	1 gram (g)
10 grams =	1 dekagram (dag)
10 dekagrams =	1 hectogram (hg)
10 hectograms =	1 kilogram (kg)
1000 kilograms =	1 megagram (Mg) or 1 metric ton(t)

Units of Length (Area)

Units	Measurement
12 inches (in) =	1 foot (ft)
3 feet =	1 yard (yd)
16½ feet =	1 rod (rd), pole, or perch
40 rods =	1 furlong (fur) = 660 feet
8 furlongs =	1 U.S. statute mile (mi) = 5280 feet
1852 meters (m) =	1 international nautical mile

International System of Units

Unit Name	Symbol	Quantity
meter	m	Length
kilogram	kg	Mass
second	s	Time
ampere	A	Electric Current
kelvin	K	Thermodynamic temperature
mole	mol	Amount of substance
candela	cd	Luminous intensity
radian	rad	Angle
steradian	sr	Solid Angle
hertz	Hz	Frequency
newton	N	Force, weight
pascal	Pa	pressure, stress
joule	J	energy, work, heat
watt	W	Power, radiant, flux
coulomb	C	Electric charge
volt	V	Voltage, electromotive force
farad	F	Electric capacitance
ohm	Ω	Electric resistance
tesla	T	Magnetic flux density
degree Celsius	0C	Temperature
becquerel	Bq	radioactivity
henry	H	Magnetic induction
Angstrom	Å	Wave length

Conversion of Units

Unit I	Value in another unit
1 Inch	2.54 centimeter
1 Foot	0.3048 meter
1 Foot	30.48 centimeter
1 Yard	0.9144 meter
1 Mile	1609.34 meter
1 Chain	20.1168 meter
1 Nautical mile	1.852 kilometer
1 Angstrom	10-10 meter
1 Square inch	6.4516 square centimeter
1 Acre	4046.86 square meter
1 grain	64.8 milligram
1 dram	1.77 gm
1 ounce	28.35 gm
1 pound	453.592 gram
1 horsepower	735.499 Watt