Convert Kilowatt-hours to Kilojoules
1 kilowatt-hour (kWh) equals 3600 kilojoules (kJ).
1 kWh = 3600 kJ
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilowatt-hour to kilojoule converter to paste a column from Excel.
How to Convert Kilowatt-hour to Kilojoule
- 1 kWh = 3600 kJ
- 1 kJ = 0.0002777777778 kWh
- Example: convert 15 kWh to kJ: 15 kWh = 15 × 3600 kJ = 54000 kJ
Formula
kJ = kWh × 3600
Derivation from SI units:
- 1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J
- 1 kJ = 10³ J
- 1 kWh = 3600000 J ÷ 1000 J per kJ = 3600 kJ
Both units are defined exactly, so the factor is exact. Kilowatt-hour definition: kilowatt-hour; Kilojoule definition: kilojoule.
Worked examples
- A reading of 10 kWh converts to 36000 kJ.
10 kWh × 3600 = 36000 kJ - A value of 75 kWh is 270000 kJ.
75 kWh × 3600 = 270000 kJ
Kilowatt-hour to Kilojoule conversion table
| Kilowatt-hours (kWh) | Kilojoules (kJ) |
|---|---|
| 0.1 kWh | 360 kJ |
| 0.5 kWh | 1800 kJ |
| 1 kWh | 3600 kJ |
| 2 kWh | 7200 kJ |
| 5 kWh | 18000 kJ |
| 10 kWh | 36000 kJ |
| 13.5 kWh | 48600 kJ |
| 20 kWh | 72000 kJ |
| 30 kWh | 108000 kJ |
| 50 kWh | 180000 kJ |
| 75 kWh | 270000 kJ |
| 100 kWh | 360000 kJ |
| 300 kWh | 1080000 kJ |
| 900 kWh | 3240000 kJ |
| 1000 kWh | 3600000 kJ |
| 10000 kWh | 36000000 kJ |
Where it's used
Kilowatt-hours are used for electricity bills and meters, while kilojoules appear in nutrition labels (kJ per serving). Both measure energy, work and heat, so the conversion is a fixed factor.
Kilowatt-hour to other energy units
| Conversion | 1 kWh equals |
|---|---|
| kilowatt-hour to joule | 3600000 J |
| kilowatt-hour to kilojoule | 3600 kJ |
| kilowatt-hour to megajoule | 3.6 MJ |
| kilowatt-hour to calorie | 860420.6501 cal |
| kilowatt-hour to kilocalorie | 860.4206501 kcal |
| kilowatt-hour to watt-hour | 1000 Wh |
| kilowatt-hour to BTU | 3412.141633 BTU |
| kilowatt-hour to therm | 0.03412956341 thm |
| kilowatt-hour to electronvolt | 2.246943267 × 10²⁵ eV |
| kilowatt-hour to foot-pound | 2655223.737 ft·lbf |
| kilowatt-hour to erg | 36000000000000 erg |
Frequently asked questions
How many kilojoules are in 1 kilowatt-hour?
1 kWh = 3600 kJ.
How do I convert kilowatt-hours to kilojoules?
Multiply the value in kWh by 3600. For example, 15 kWh × 3600 = 54000 kJ.
Is the kWh to kJ conversion exact?
Yes. Both units are defined exactly, and 1 kWh is exactly 3600 kJ.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "kilowatt hour (kW·h)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Kilowatt-hours to Kilojoules. Retrieved October 17, 2026, from https://scientificconverters.com/energy/kilowatt-hours-to-kilojoules/
IEEE
Scientific Converters, "Convert Kilowatt-hours to Kilojoules," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/kilowatt-hours-to-kilojoules/