To convert a kilowatt-hour measurement to a joule measurement, multiply the energy by the conversion ratio.

Since one kilowatt-hour is equal to 3,600,000 joules, you can use this simple formula to convert:

How Many Joules are in a Kilowatt-hour?

There are 3,600,000 joules in a kilowatt-hour, which is why we use this value in the formula above.

1 kWh = 3,600,000 J

Kilowatt-hours and joules are both units used to measure energy. Keep reading to learn more about each unit of measure.

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A kilowatt-hour is a measure of electrical energy equal to one kilowatt, or 1,000 watts, of power over a one hour period. Kilowatt-hours are a measure of electrical work performed over a period of time, and are often used as a way of measuring energy usage by electric companies.

Kilowatt-hours are usually abbreviated as kWh, although the formally adopted expression is kW·h. The abbreviation kWh is also sometimes used. For example, 1 kilowatt-hour can be written as 1 kWh, 1 kW·h, or 1 kWh.

In formal expressions, the centered dot (·) or space is used to separate units used to indicate multiplication in an expression and to avoid conflicting prefixes being misinterpreted as a unit symbol.<1>


The joule is the energy equal to the force on an object of one newton at a distance of one meter.<2> One joule is equal to the heat energy dissipated by the current of one ampere through one ohm of resistance for one second.

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One joule is also equal to the energy needed to move an electric charge of one coulomb through a potential difference of one volt. In addition, one joule is also equal to the one watt-second.

The joule is the SI derived unit for energy in the metric system. Joules can be abbreviated as J; for example, 1 joule can be written as 1 J.

Kilowatt-hour to Joule Conversion Table

Kilowatt-hour measurements converted to joules Kilowatt-hours Joules
0.000001 kWh 3.6 J
0.000002 kWh 7.2 J
0.000003 kWh 10.8 J
0.000004 kWh 14.4 J
0.000005 kWh 18 J
0.000006 kWh 21.6 J
0.000007 kWh 25.2 J
0.000008 kWh 28.8 J
0.000009 kWh 32.4 J
0.0000001 kWh 0.36 J
0.000001 kWh 3.6 J
0.00001 kWh 36 J
0.0001 kWh 360 J
0.001 kWh 3,600 J
0.01 kWh 36,000 J
0.1 kWh 360,000 J
1 kWh 3,600,000 J


Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019, Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019,