International System of Units (SI)


 

Base quantity Name Symbol
length meter m
mass kilogram kg
time second s
electric current ampere A
thermodynamic temperature kelvin K
amount of substance mole mol
luminous intensity candela cd

 

Metric Unit of Measurements

Length Area
10 millimeters = 1 centimeter 100 sq. mm = 1 sq. cm
10 centimeters = 1 decimeter 10 000 sq. cm = 1 sq. meter
10 decimeters = 1 meter 100 sq. meters = 1 are
10 meters = 1 decameter 100 ares = 1 hectare
10 decameters = 1 hectometer 10 000 sq. meters = 1 hectare
10 hectometers = 1 kilometer 100 hectares = 1 sq. kilometer
1000 meters = 1 kilometer 1 000 000 sq. meters = 1 sq. kilometer
   
Volume
Capacity
1000 cu. mm = 1 cu. cm 10 milliliters = 1 centiliter
1000 cu. cm = 1 cu. decimeter 10 centiliter = 1 deciliter
1000 cu. dm = 1 cu. meter 10 deciliters = 1 liter
1 million cu. cm = 1 cu. meter 1000 liters = 1 cu. meter
   
Mass
1000 grams = 1 kilogram
1000 kilograms = 1 ton

 

The Prefixes of the SI

yotta [Y] 1 000 000 000 000 000 000 000 000
= 10^24
zetta [Z] 1 000 000 000 000 000 000 000
= 10^21
exa [E] 1 000 000 000 000 000 000
= 10^18
peta [P] 1 000 000 000 000 000
= 10^15
tera [T] 1 000 000 000 000
= 10^12
giga [G] 1 000 000 000
(a thousand millions = a billion)
mega [M] 1 000 000
(a million) kilo [k] 1 000 (a thousand)
hecto [h] 100  
deca [da] 10  
1  
deci [d] 0.1  
centi [c] 0.01  
milli [m] 0.001 (a thousandth)
micro [µ] 0.000 001 (a millionth)
nano [n] 0.000 000 001 (a thousand millionth)
pico [p] 0.000 000 000 001 = 10^-12
femto [f] 0.000 000 000 000 001 = 10^-15
atto [a] 0.000 000 000 000 000 001 = 10^-18
zepto [z] 0.000 000 000 000 000 000 001 = 10^-21
yocto [y] 0.000 000 000 000 000 000 000 001 = 10^-24

 

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