Convert Kilojoules to Kilowatt-hours
Convert Kilojoules to Kilowatt-hours instantly. 1 Kilojoule (kJ) equals 0.0002778 Kilowatt-hours (kWh).
Kilojoules to Kilowatt-hours conversion table
| Kilojoules (kJ) | Kilowatt-hours (kWh) |
|---|---|
| 1 kJ | 0.0002778 kWh |
| 2 kJ | 0.0005556 kWh |
| 3 kJ | 0.0008333 kWh |
| 5 kJ | 0.001389 kWh |
| 10 kJ | 0.002778 kWh |
| 20 kJ | 0.005556 kWh |
| 50 kJ | 0.01389 kWh |
| 100 kJ | 0.02778 kWh |
| 500 kJ | 0.1389 kWh |
| 1,000 kJ | 0.2778 kWh |
1 Kilojoule = 0.0002778 Kilowatt-hours · multiply Kilojoules by 0.0002778
About converting Kilojoules to Kilowatt-hours
Kilojoules (kJ) and Kilowatt-hours (kWh) are both units of energy, so converting between them is a single multiplication: multiply your Kilojoules figure by 0.0002778. Ten Kilojoules comes to 0.002778 Kilowatt-hours, and a hundred works out at 0.02778 Kilowatt-hours.
Rule of thumb: going from Kilojoules to Kilowatt-hours divides, so the figure always shrinks — it takes about 3,600 Kilojoules to make a single Kilowatt-hour. If your answer came out bigger, you have the conversion the wrong way round.
What is a Kilojoule?
A kilojoule is a thousand joules, the size at which the joule becomes practical for everyday quantities. In Australia and New Zealand it is the primary unit on nutrition labels — food energy is quoted in kilojoules first, with calories relegated to a secondary figure or dropped entirely — so shoppers there think about daily intake in thousands of kilojoules rather than thousands of calories. It is also the working unit of chemistry, where reaction and bond energies are tabulated per mole. European labels print both kJ and kcal, which is why the same packet carries two different numbers for the same food.
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: a slice of bread carries roughly 300 kilojoules, 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 Kilojoules converter, or browse all Energy converters.
Frequently asked questions
How many Kilowatt-hours are in one Kilojoule?
There are 0.0002778 Kilowatt-hours in one Kilojoule.
How do I convert Kilojoules to Kilowatt-hours?
Multiply the number of Kilojoules by 0.0002778. For example, 10 Kilojoules = 0.002778 Kilowatt-hours.
What is 100 Kilojoules in Kilowatt-hours?
100 Kilojoules is equal to 0.02778 Kilowatt-hours.
How do I convert Kilowatt-hours to Kilojoules?
Multiply the Kilowatt-hours value by 3,600 (or divide by 0.0002778).
Is this Kilojoules to Kilowatt-hours conversion exact?
The definition is exact — Kilojoules 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 Kilojoule?
A kilojoule is a thousand joules, the size at which the joule becomes practical for everyday quantities. In Australia and New Zealand it is the primary unit on nutrition labels — food energy is quoted in kilojoules first, with calories relegated to a secondary figure or dropped entirely — so shoppers there think about daily intake in thousands of kilojoules rather than thousands of calories. It is also the working unit of chemistry, where reaction and bond energies are tabulated per mole. European labels print both kJ and kcal, which is why the same packet carries two different numbers for the same food.
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.