Convert watt seconds to quads

In physics, energy is a scalar physical quantity that describes the amount of work that can be performed by a force, an attribute of objects and systems that is subject to a conservation law. Different forms of energy include kinetic, potential, thermal, gravitational, sound, light, elastic, and electromagnetic energy. The forms of energy are often named after a related force. (Wikipedia)
Energy units are often used in relation to environmental protection, energy reserves and geopolitics.

Starting unit

• Joule family
  • gigajoule (GJ)
  • megajoule (MJ)
  • kilojoule (kJ)
  • joule (J)
• calories and kilocalories
  • kilocalorie (kcal)
  • calorie (cal)
• watt x time
  • kilowatt hour (kWh)
  • megawatt hour (MWh)
  • watt hour (Wh)
  • watt second (Ws)
• energy equivalent units
  • kg of oil equivalent (koe)
  • tonne of oil equivalent (toe)
  • thousand tonnes of oil equivalent (ktoe)
  • million tonnes of oil equivalent (Mtoe)
  • barrel of oil equivalent (boe)
  • thousand barrels of oil equivalent (kboe)
  • million barrels of oil equivalent (Mboe)
  • billion m³ natural gas (Gm³ NG)
  • billion ft³ natural gas (Gft³ NG)
  • million tonnes liquefied natural gas (Mt LNG)
  • billion tonnes liquefied natural gas (Gt LNG)
  • kg hard coal (kg SKE)
  • t hard coal (t SKE)
• electronVolt
  • gigaelectronvolt (GeV)
  • tera-electronvolt (TeV)
  • mega-electronvolt (MeV)
  • kilo-electronvolt (keV)
  • electronvolt (eV)
• other energy units
  • british thermal unit (Btu)
  • million btu (MMBtu)
  • therm (thm)
  • quad (quad)
  • erg (erg)
  • megatonne TNT (Mt)
  • kilotonne TNT (kT)
  • Foot-pound (ft-lb)

Destination unit

• Joule family
  • gigajoule (GJ)
  • megajoule (MJ)
  • kilojoule (kJ)
  • joule (J)
• calories and kilocalories
  • kilocalorie (kcal)
  • calorie (cal)
• watt x time
  • kilowatt hour (kWh)
  • megawatt hour (MWh)
  • watt hour (Wh)
  • watt second (Ws)
• energy equivalent units
  • kg of oil equivalent (koe)
  • tonne of oil equivalent (toe)
  • thousand tonnes of oil equivalent (ktoe)
  • million tonnes of oil equivalent (Mtoe)
  • barrel of oil equivalent (boe)
  • thousand barrels of oil equivalent (kboe)
  • million barrels of oil equivalent (Mboe)
  • billion m³ natural gas (Gm³ NG)
  • billion ft³ natural gas (Gft³ NG)
  • million tonnes liquefied natural gas (Mt LNG)
  • billion tonnes liquefied natural gas (Gt LNG)
  • kg hard coal (kg SKE)
  • t hard coal (t SKE)
• electronVolt
  • gigaelectronvolt (GeV)
  • tera-electronvolt (TeV)
  • mega-electronvolt (MeV)
  • kilo-electronvolt (keV)
  • electronvolt (eV)
• other energy units
  • british thermal unit (Btu)
  • million btu (MMBtu)
  • therm (thm)
  • quad (quad)
  • erg (erg)
  • megatonne TNT (Mt)
  • kilotonne TNT (kT)
  • Foot-pound (ft-lb)