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Gigajoule Converters

Convert gigajoules to and from various energy units including joules, kilowatt-hours, BTUs, calories, and more.

What this tool does

Convert gigajoules to and from various energy units including joules, kilowatt-hours, BTUs, calories, and more. Type an amount in gigajoules, choose the units, and the tool converts it to kilowatt-hours. It offers 18 energy units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 18 options, including Gigajoule, Joule, Kilojoule, Megajoule, Terajoule, Watt-hour. Starts as Gigajoule.
  • To: Choose one of the same 18 units as "From". Starts as Kilowatt-hour.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from gigajoules to kilowatt-hours:

  • 1 GJ ≈ 277.777778 kWh
  • 5 GJ ≈ 1,388.888889 kWh
  • 10 GJ ≈ 2,777.777778 kWh
  • 50 GJ ≈ 13,888.888889 kWh
  • 100 GJ ≈ 27,777.777778 kWh

Multiply the number of gigajoules by about 277.777778 to get kilowatt-hours. The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Gigajoule: SI Brochure, 9th edition (2019, updated 2022), Table 7 (SI prefixes). Kilowatt-hour: exact by definition.

Limitations

  • Converts units of energy only. It does not work out energy from power, time, voltage or charge.

FAQs

Q: How many kilowatt-hours are in one gigajoule?
A: One gigajoule is about 277.77778 kilowatt-hours. Change the value to convert any amount; the other units are listed below the result.
Q: Which definition of the units does this page use?
A: Calories here are thermochemical calories (1 cal = 4.184 J exactly), the definition commonly used in chemistry and nutrition. The International Table calorie (4.1868 J) is slightly larger. BTU here is the International Table BTU (about 1055.06 J), the usual definition for heating and cooling. The thermochemical BTU is slightly smaller. The therm shown is the EC therm (105.506 MJ, very nearly 100,000 BTU).
Q: Can I convert from kilowatt-hours to gigajoules?
A: Yes. Choose kilowatt-hour in the From box and gigajoule in the To box. One kilowatt-hour is 0.0036 gigajoules.

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