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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 

Fuel energy equivalents chartDownload and print Fuel Energy Equivalents chart

Example - Convert from Btu to Natural gas nm3

The equivalent of 100 Btu energy can be approximated to 0.0025 nm3 of natural gas as indicated in the chart below.

Fuel energy equivalents chart - example

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