Convert Kilojoules to Kilowatt-hours
1 kilojoule (kJ) equals 0.0002777777778 kilowatt-hours (kWh).
1 kJ = 0.0002777777778 kWh
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilojoule to kilowatt-hour converter to paste a column from Excel.
How to Convert Kilojoule to Kilowatt-hour
- 1 kJ = 0.0002777777778 kWh
- 1 kWh = 3600 kJ
- Example: convert 15 kJ to kWh: 15 kJ = 15 × 0.0002777777778 kWh = 0.004166666667 kWh
Formula
kWh = kJ ÷ 3600
Derivation from SI units:
- 1 kJ = 10³ J
- 1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J
- 1 kJ = 1000 J ÷ 3600000 J per kWh = 0.0002777777777778 kWh
Both units are defined exactly, so the factor is exact. Kilojoule definition: kilojoule; Kilowatt-hour definition: kilowatt-hour.
Worked examples
- A reading of 100 kJ converts to 0.02777777778 kWh.
100 kJ × 0.0002777777778 = 0.02777777778 kWh - A value of 1000 kJ is 0.2777777778 kWh.
1000 kJ × 0.0002777777778 = 0.2777777778 kWh
Kilojoule to Kilowatt-hour conversion table
| Kilojoules (kJ) | Kilowatt-hours (kWh) |
|---|---|
| 1 kJ | 0.0002777777778 kWh |
| 4.184 kJ | 0.001162222222 kWh |
| 10 kJ | 0.002777777778 kWh |
| 50 kJ | 0.01388888889 kWh |
| 100 kJ | 0.02777777778 kWh |
| 250 kJ | 0.06944444444 kWh |
| 500 kJ | 0.1388888889 kWh |
| 840 kJ | 0.2333333333 kWh |
| 1000 kJ | 0.2777777778 kWh |
| 2000 kJ | 0.5555555556 kWh |
| 8700 kJ | 2.416666667 kWh |
| 10000 kJ | 2.777777778 kWh |
Where it's used
Kilojoules are used for nutrition labels (kJ per serving), while kilowatt-hours appear in electricity bills and meters. Both measure energy, work and heat, so the conversion is a fixed factor.
Kilojoule to other energy units
| Conversion | 1 kJ equals |
|---|---|
| kilojoule to joule | 1000 J |
| kilojoule to megajoule | 0.001 MJ |
| kilojoule to calorie | 239.0057361 cal |
| kilojoule to kilocalorie | 0.2390057361 kcal |
| kilojoule to watt-hour | 0.2777777778 Wh |
| kilojoule to kilowatt-hour | 0.0002777777778 kWh |
| kilojoule to BTU | 0.9478171203 BTU |
| kilojoule to therm | 0.00000948043428 thm |
| kilojoule to electronvolt | 6.241509074 × 10²¹ eV |
| kilojoule to foot-pound | 737.5621493 ft·lbf |
| kilojoule to erg | 10000000000 erg |
Frequently asked questions
How many kilowatt-hours are in 1 kilojoule?
1 kJ = 0.0002777777778 kWh.
How do I convert kilojoules to kilowatt-hours?
Multiply the value in kJ by 0.0002777777778, or divide it by 3600. For example, 15 kJ × 0.0002777777778 = 0.004166666667 kWh.
Is the kJ to kWh conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- 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)".
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 Kilojoules to Kilowatt-hours. Retrieved October 17, 2026, from https://scientificconverters.com/energy/kilojoules-to-kilowatt-hours/
IEEE
Scientific Converters, "Convert Kilojoules to Kilowatt-hours," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/kilojoules-to-kilowatt-hours/