The International System of Units (SI) is founded on seven SI base units for seven base quantities assumed to be mutually independent, as given in Table 1. Here is the SI list from the NIST reference on Constants, Units and Uncertainty.
Table 1. SI base units 




For detailed information on the SI base units, see Definitions of the SI base units and their Historical context.
SI derived units
Other quantities, called derived quantities, are defined in terms of the seven base quantities via a system of quantity equations. The SI derived units for these derived quantities are obtained from these equations and the seven SI base units. Examples of such SI derived units are given in Table 2, where it should be noted that the symbol 1 for quantities of dimension 1 such as mass fraction is generally omitted.
Table 2. Examples of SI derived units 

SI derived unit


Derived quantity  Name  Symbol 

area  square meter  m^{2} 
volume  cubic meter  m^{3} 
speed, velocity  meter per second  m/s 
acceleration  meter per second squared  m/s^{2} 
wave number  reciprocal meter  m^{1} 
mass density  kilogram per cubic meter  kg/m^{3} 
specific volume  cubic meter per kilogram  m^{3}/kg 
current density  ampere per square meter  A/m^{2} 
magnetic field strength  ampere per meter  A/m 
amountofsubstance concentration  mole per cubic meter  mol/m^{3} 
luminance  candela per square meter  cd/m^{2} 
mass fraction  kilogram per kilogram, which may be represented by the number 1  kg/kg = 1 
Table 3. SI derived units with special names and symbols
Table 4. Examples of SI derived units whose names and symbols include SI derived units with special names and symbols
For Table 3 and Table 4, click here.