How many joules are in one kilowatt-hour?

One kilowatt-hour equals 3,600,000 J. The formula is J = kWh × 3,600,000.

How do I convert kilowatt-hours to joules?

Multiply the value in kilowatt-hours by 3,600,000. For example, 100 × 3,600,000 = 360,000,000 — so 100 kWh = 360,000,000 J.

Pair · linear · factor 3,600,000

kilowatt-hours to joules

kWhJ

Active unit

kilowatt-hours · ≈ 360,000,000 J (base)

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kWhkilowatt-hour100

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Frequently asked questions

A glowing emerald doughnut with a battery-and-lightning symbol at its centre, wrapped in a geometric grid, against a cosmic nebula in violet and magenta

Energy

How much energy is in a doughnut — calories, joules and kilowatt-hours

A calorie on your plate, a joule in the lab and a kilowatt-hour on your electricity bill all describe exactly the same thing: the ability to do work. One traditional doughnut holds about 407 watt-hours of energy — enough to run an efficient LED for more than a day, or charge a smartphone nearly 24 times. Here is how a single pastry ties together nutrition, physics and your power bill.

13 min