Fuel Equivalents - Online Calculator

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

Value

J (Joule)

kJ (kilo Joule)

kWh

Nm³ natural gas

ft³ natural gas

tonn coal equivalent (tce)

tonn oil equivalent (toe)

barrel oil equivalent (boe)

kcal

Btu

• 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 

Download 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.

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