Convert Joules to Kilowatt-hours
Convert Joules to Kilowatt-hours instantly. 1 Joule (J) equals 0.0000002778 Kilowatt-hours (kWh).
Joules to Kilowatt-hours conversion table
| Joules (J) | Kilowatt-hours (kWh) |
|---|---|
| 1 J | 0.0000002778 kWh |
| 2 J | 0.0000005556 kWh |
| 3 J | 0.0000008333 kWh |
| 5 J | 0.000001389 kWh |
| 10 J | 0.000002778 kWh |
| 20 J | 0.000005556 kWh |
| 50 J | 0.00001389 kWh |
| 100 J | 0.00002778 kWh |
| 500 J | 0.0001389 kWh |
| 1,000 J | 0.0002778 kWh |
1 Joule = 0.0000002778 Kilowatt-hours · multiply Joules by 0.0000002778
About converting Joules to Kilowatt-hours
Joules (J) and Kilowatt-hours (kWh) are both units of energy, so converting between them is a single multiplication: multiply your Joules figure by 0.0000002778. Ten Joules comes to 0.000002778 Kilowatt-hours, and a hundred works out at 0.00002778 Kilowatt-hours.
Rule of thumb: going from Joules to Kilowatt-hours divides, so the figure always shrinks — it takes about 3,600,000 Joules to make a single Kilowatt-hour. If your answer came out bigger, you have the conversion the wrong way round.
What is a Joule?
The joule is the SI unit of energy and the reference every other energy unit here is defined against. One joule is one newton acting over one metre — push with a newton of force, move a metre, and you have spent a joule. It is named after James Prescott Joule, whose painstaking experiments established that heat and mechanical work are the same thing, measurable in the same units. That result sounds obvious now and was foundational then: it collapsed heat, motion and work into a single quantity called energy, which is why one unit can serve food, electricity, explosives and engines alike.
What is a Kilowatt-hour?
The kilowatt-hour is the unit your electricity bill is charged in, and almost the only energy unit most people meet by name. It is energy, not power: a kilowatt is a rate of use, a kilowatt-hour is the amount consumed by running at that rate for an hour. Utilities bill in kWh because that is what they actually deliver — a meter counts accumulated energy, not instantaneous demand. It is also the unit that sizes batteries. An EV pack and a home storage unit are both quoted in kilowatt-hours, so the figure tells you how much range or backup you have bought, while the kilowatt rating only says how fast it can be delivered.
To put both in perspective: lifting an apple one metre takes about a joule, while an electric car covers roughly five kilometres on a kilowatt-hour.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Kilowatt-hours to Joules converter, or browse all Energy converters.
Frequently asked questions
How many Kilowatt-hours are in one Joule?
There are 0.0000002778 Kilowatt-hours in one Joule.
How do I convert Joules to Kilowatt-hours?
Multiply the number of Joules by 0.0000002778. For example, 10 Joules = 0.000002778 Kilowatt-hours.
What is 100 Joules in Kilowatt-hours?
100 Joules is equal to 0.00002778 Kilowatt-hours.
How do I convert Kilowatt-hours to Joules?
Multiply the Kilowatt-hours value by 3,600,000 (or divide by 0.0000002778).
Is this Joules to Kilowatt-hours conversion exact?
The definition is exact — Joules and Kilowatt-hours are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
What is a Joule?
The joule is the SI unit of energy and the reference every other energy unit here is defined against. One joule is one newton acting over one metre — push with a newton of force, move a metre, and you have spent a joule. It is named after James Prescott Joule, whose painstaking experiments established that heat and mechanical work are the same thing, measurable in the same units. That result sounds obvious now and was foundational then: it collapsed heat, motion and work into a single quantity called energy, which is why one unit can serve food, electricity, explosives and engines alike.
What is a Kilowatt-hour?
The kilowatt-hour is the unit your electricity bill is charged in, and almost the only energy unit most people meet by name. It is energy, not power: a kilowatt is a rate of use, a kilowatt-hour is the amount consumed by running at that rate for an hour. Utilities bill in kWh because that is what they actually deliver — a meter counts accumulated energy, not instantaneous demand. It is also the unit that sizes batteries. An EV pack and a home storage unit are both quoted in kilowatt-hours, so the figure tells you how much range or backup you have bought, while the kilowatt rating only says how fast it can be delivered.