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UNIT CONVERTER

Energy

Calories are thermochemical; BTU uses the IT definition.

Result

SI / metric also includes non-SI metric units. Check distinctions such as US and UK units.

Results in other units

Displayed values are rounded. Check the unit type and definition before use.

How to convert, examples and notes

About energy conversion

Choose the input and output units, then enter a number. The result updates on this device.

Conversion examples (rounded)

  • 1 J = 0.000000277777777778 kWh
  • 10 J = 0.00000277777777778 kWh

Some supported units: J · kJ · MJ · Wh · kWh · cal (13 units in this category).

Calories are thermochemical; BTU uses the IT definition.

The nearby list shows the reference unit and up to two rows on either side. Expand it to see every unit. Check SI / metric, imperial / US customary and other definitions before important use.

Energy conversion between kWh, J and kcal

J = kWh × 3,600,000; J = kcal × 4,184

  • 1 kWh = 3.6 MJ
  • 1 kcal = 4,184 J
  • 1 Wh = 3,600 J

Examples are rounded; choose the required display digits in the converter.

What is the difference between kW and kWh?

kW measures power, while kWh measures energy. A constant 1 kW used for one hour amounts to 1 kWh. Converting between power and energy requires a duration.

Conversion table for 1 J

Fixed reference values, rounded to 10 significant digits. Use the converter above for your own value.

UnitName1 J equals
JJoule1 J
kJKilojoule0.001 kJ
MJMegajoule0.000001 MJ
WhWatt hour0.0002777777778 Wh
kWhKilowatt hour0.0000002777777778 kWh
calCalorie (thermochemical)0.2390057361 cal
kcalKilocalorie (thermochemical)0.0002390057361 kcal
BTUBritish thermal unit (IT)0.0009478171203 BTU
mJMillijoule1,000 mJ
GJGigajoule0.000000001 GJ
ergErg10,000,000 erg
eVElectronvolt6,241,509,074,000,000,000 eV
ft·lbfFoot-pound-force0.7375621493 ft·lbf