Kilowatt-hours to Kilojoules Converter
Enter the energy in kilowatt-hours below to convert it to kilojoules.
Convert Kilowatt-hours to Kilojoules
Enter a value in kilowatt-hours (kWh) to convert to kilojoules (kJ).
Kilowatt-hour to Kilojoule Conversion Table
Table showing various kilowatt-hour measurements converted to kilojoules. Click any preset value or arrow to load it into the converter.
| Kilowatt-hours (kWh) | Kilojoules (kJ) |
|---|---|
| 1 kWh | 3,600 kJ |
| 2 kWh | 7,200 kJ |
| 2.5 kWh | 9,000 kJ |
| 5 kWh | 18,000 kJ |
| 10 kWh | 36,000 kJ |
| 15 kWh | 54,000 kJ |
| 20 kWh | 72,000 kJ |
| 25 kWh | 90,000 kJ |
| 30 kWh | 108,000 kJ |
| 50 kWh | 180,000 kJ |
How to Convert Kilowatt-hours to Kilojoules
To convert kilowatt-hours to kilojoules, multiply the energy by the following conversion ratio: 3,600 kilojoules/kilowatt-hour.
Since one kilowatt-hour is equal to 3,600 kilojoules, you can use this simple formula to convert:
The energy in kilojoules is equal to the energy in kilowatt-hours multiplied by 3,600.
For example, here's how to convert 5 kilowatt-hours to kilojoules using the formula above.
How Many Kilojoules Are in a Kilowatt-hour?
There are 3,600 kilojoules in a kilowatt-hour, which is why we use this value in the formula above.
Our kilowatt-hour to kilojoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Kilowatt-hours and kilojoules are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Kilowatt-hour?
A kilowatt-hour is a unit of energy equal to 3,600,000 joules (J), the base unit for energy. Equal to 3.6 Megajoules (1,000 Wh). [1]
The kilowatt-hour is classified as a metric and SI-compatible unit of energy. Kilowatt-hours can be abbreviated as kWh; for example, 1 kilowatt-hour can be written as 1 kWh.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilowatt-hour (kWh) a convenient decimal multiple of the joule (J).
In practice, kilowatt-hours (kWh) are widely used across large-scale industrial, bulk, and macro-level energy specifications within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Kilojoule?
A kilojoule is a unit of energy equal to 1,000 joules (J), the base unit for energy. Equal to 1,000 Joules. [2]
The kilojoule is classified as a metric and SI-compatible unit of energy. Kilojoules can be abbreviated as kJ; for example, 1 kilojoule can be written as 1 kJ.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilojoule (kJ) a convenient decimal multiple of the joule (J).
In practice, kilojoules (kJ) are widely used across large-scale industrial, bulk, and macro-level energy specifications within SI metric workflows, engineering documentation, and technical data sheets.
When converting energy between kilowatt-hours (kWh) and kilojoules (kJ), keep full floating-point precision (1 kWh = 3,600 kJ; 1 kJ = 0.000277778 kWh) during intermediate calculations and round only the final kilojoule figure to match your instrument tolerance.
More Kilowatt-hour & Kilojoule Conversions
Need to calculate in the opposite direction? Use our kilojoules to kilowatt-hours calculator to switch your starting unit immediately. You can also explore related tools such as converting kilojoules to kilowatt-hours, converting joules to kilojoules, or converting kilocalories to kilojoules.
Convert from Kilowatt-hours
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Kilowatt-hours (kWh) to Kilojoules (kJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Kilowatt-hour (kWh) & Kilojoule (kJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (kWh to kJ)