The International System of Units

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Length

 Common Multiples and Subdivisions kilometer (km) 103 m decimeter (dm) 10-1 m centimeter (cm) 10-2 m millimeter (mm) 10-3 m micrometer (µm)* 10-6 m nanometer (nm) 10-9 m angstrom (Å) 10-10 m
*Also called the micron (µ)

Mass

 Common Multiples and Subdivisions kilogram (kg) 103 g (2.2 lb) centigram (cg) 10-2 g milligram (mg) 10-3 g microgram (µg) 10-6 g nanogram (ng) 10-9 g picogram (pg) 10-12 g

Volume

Basic unit is the liter, which equals 1 cubic decimeter, dm3 (1.06 quart). A liter of water at its maximum density weighs almost 1 kg. Therefore, 1 ml (= 10-3 liter) of water weighs, for all practical purposes, 1 g. One cubic centimeter (cm3 or cc) is 10-3 dm3. Therefore, it is equal to 1 ml, and the units ml and cc are used interchangeably.

Temperature

Basic unit is the Celsius (formerly known as centigrade) degree, oC. 0oC is the freezing point of water; 100oC is the boiling point of water. To convert from oC to oF (Fahrenheit) or vice versa: oF - 32 = 9/5 oC.

Useful Equivalents

Length
1 inch = 2.54 cm
Mass
1 oz = 28.35 g
1 lb = 453.6 g
Volume
1 U.S. fluid oz = 29.57 ml
1 U.S. liquid qt = 0.946 liter (l)
Pressure
1 pound per square inch (psi) = 6.89 kilopascals (kPa)