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Energy Conversion Calculator
Convert between energy units, volumetric units, or across categories using fuel-specific energy densities.
This free calculator supports 18 energy units including kilowatt-hours (kWh), British thermal units (BTU), therms, megajoules (MJ), kilocalories, and pounds of steam (at 970 BTU/lb). It also converts between 11 volumetric units such as gallons, liters, cubic feet, and cubic meters. Use the fuel-specific mode to calculate energy content for natural gas, propane, diesel, gasoline, kerosene, and ethanol based on standardized energy density constants.
Energy unit conversion is essential for facility managers comparing utility bills across fuel types, engineers validating building energy models, and sustainability teams calculating Scope 1 and Scope 2 emissions. This calculator eliminates manual lookup tables and conversion factor errors — enter a value in any supported unit and see instant results across all compatible units.
Common use cases include converting natural gas therms to kWh for benchmarking, calculating BTU output from steam flow measurements, translating diesel fuel consumption into megajoules for carbon reporting, and comparing propane energy content against electricity costs per unit of delivered energy.
Conversion Mode
Common Energy Equivalents
| Unit | Equivalent |
|---|---|
| 1 kWh | 3,412 BTU |
| 1 therm | 100,000 BTU = 29.3 kWh |
| 1 MMBTU | 293.07 kWh = 10 therms |
| 1 GJ | 277.78 kWh = 947,817 BTU |
| 1 CCF natural gas | ≈ 103,000 BTU ≈ 1.03 therms |
| 1 US gallon diesel | ≈ 138,500 BTU ≈ 40.6 kWh |