For convenience, certain coherent derived units have been given special names and symbols. There are 22 such units (see Table below). These special names and symbols may themselves be used in combination with the names and symbols for base units and for other derived units to express the units of other derived quantities.
Derived quantity  SI coherent derived unit  
Name  Symbol  Expressed in terms of other SI units 
Expressed in terms of SI base units 

plane angle  radian  rad  1  m/m 
solid angle  steradian  sr  1  m^{2}/m^{2} 
frequency  hertz  Hz  s^{–1}  
force  newton  N  m kg s^{–2}  
pressure, stress  pascal  Pa  N/m^{2}  m^{–1} kg s^{–2} 
energy, work, amount of heat  joule  J  N m  m^{2} kg s^{–2} 
power, radiant flux  watt  W  J/s  m^{2} kg s^{–3} 
electric charge, amount of electricity  coulomb  C  s A  
electric potential difference, electromotive force 
volt  V  W/A  m^{2} kg s^{–3} A^{–1} 
capacitance  farad  F  C/V  m^{–2} kg^{–1} s^{4} A^{2} 
electric resistance  ohm  Ω  V/A  m^{2} kg s^{–3} A^{–2} 
electric conductance  siemens  S  A/V  m^{–2} kg^{–1} s^{3} A^{2} 
magnetic flux  weber  Wb  V s  m^{2} kg s^{–2} A^{–1} 
magnetic flux density  tesla  T  Wb/m^{2}  kg s^{–2} A^{–1} 
inductance  henry  H  Wb/A  m^{2} kg s^{–2} A^{–2} 
Celsius temperature  degree Celsius  °C  K  
luminous flux  lumen  lm  cd sr  cd 
illuminance  lux  lx  lm/m^{2}  m^{–2} cd 
activity referred to a radionucleide  becquerel  Bq  s^{–1}  
absorbed dose  gray  Gy  J/kg  m^{2} s^{–2} 
dose equivalent, ιambient dose equivalent, directional dose equivalent, personal dose equivalent 
sievert  Sv  J/kg  m^{2} s^{–2} 
catalytic activity  katal  kat  s^{–1} mol 