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kWh to BTU Calculator

Convert kWh to BTU, MMBtu, therms, and megajoules. WattSimple also shows the same amount of energy expressed as fuel (gallons of propane, heating oil, gasoline, or diesel), using the EIA energy-content figures.

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The same energy, as fuel

Therms of natural gas
3.412 therms
Gallons of propane
3.731 gal
Gallons of heating oil (No. 2)
2.464 gal
Gallons of gasoline
2.837 gal
Gallons of diesel
2.484 gal

Higher-heating-value energy content per unit of fuel, from the EIA energy conversion tables. These compare the energy contained, not the useful heat delivered: a gas furnace at 80% AFUE turns only 80% of a therm into room heat, while a heat pump delivers several times the energy content of the electricity it draws.

British thermal units

341,214 BTU

Kilowatt-hours
100 kWh
BTU
341,214
MMBtu
0.34121
Therms
3.4121
Megajoules
360 MJ

1 kWh = 3,412.142 BTU · 1 therm = 100,000 BTU · 1 MMBtu = 10 therms

Frequently asked questions

Multiply kilowatt-hours by 3,412.14. Example: 100 kWh = 341,214 BTU, or about 3.41 therms. To go back, divide BTU by 3,412.14.

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Sources & standards

This tool's methodology and data follow US standards and authoritative public datasets: