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Online Fuel Equivalents Calculator

Online calculator to compute fuels energy equivalents - oil and gas

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The calculator below can used to convert between some common fuel energy equivalents:


J (Joule)
kJ (kilo Joule)
Nm3 natural gas
ft3 natural gas
tonn coal equivalent (tce)
tonn oil equivalent (toe)
barrel oil equivalent (boe)

  • Standard reference fuels are statistical units of a defined gross heat content
  • Natural gas equivalents assume 1000 Btu/ft3 gross - or 9400 kcal/Nm3 or 39.4 MJ/Nm3 
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