kJ to kWh Converter
Quick answer: To convert kJ to kWh, multiply by 0.0002777778. For example, 10 kJ is 0.002777778 kWh. One kilojoule equals 0.0002777778 kWh.
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Use the kJ to kWh Converter
kJ to kWh formula and what each symbol means
kWh = kJ × 0.0002777778
| Symbol | Meaning |
|---|---|
| kJ | Kilojoule |
| kWh | Kilowatt hour |
kJ to kWh examples
1 kJ
1 kJ × 0.0002777778 = 0.0002777778 kWh.
10 kJ
10 kJ × 0.0002777778 = 0.002777778 kWh.
100 kJ
100 kJ × 0.0002777778 = 0.02777778 kWh.
kJ compared with kWh
One kWh is 3,600 times as large as one kJ, so your number gets smaller when you convert kJ to kWh and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.
About kJ and kWh
Kilojoule (kJ): 1,000 joules. Kilowatt hour (kWh): Energy used by a 1 kW device in one hour, exactly 3.6 MJ.
Where kJ to kWh conversions are used
Engineering and physics calculations usually work in joules. Food labels show kilocalories or kilojoules, and electricity bills use kilowatt-hours.
How to calculate kJ to kWh step by step
- Enter the value in kJ (the starting unit).
- Multiply by 0.0002777778, because 1 kJ = 0.0002777778 kWh.
- The product is the value in kWh. To go back, divide by 0.0002777778 or multiply by 3,600.
Popular energy conversions
How to read your kJ to kWh result
Quick estimate: multiply by about 0.00028 to get kWh from kJ; this is within 0.8% of the exact factor. Food labels use the kilocalorie (kcal, written Calorie in the US), electricity bills use the kilowatt hour, and heating uses the Btu.
| KJ | KWH |
|---|---|
| 1 | 0.0002777778 |
| 2 | 0.0005555556 |
| 5 | 0.001388889 |
| 10 | 0.002777778 |
| 20 | 0.005555556 |
| 50 | 0.01388889 |
| 100 | 0.02777778 |
| 1,000 | 0.2777778 |
kWh to kJ: quick table
| KWH | KJ |
|---|---|
| 1 | 3,600 |
| 5 | 18,000 |
| 10 | 36,000 |
| 25 | 90,000 |
| 50 | 180,000 |
| 100 | 360,000 |
| 250 | 900,000 |
| 500 | 1,800,000 |
Common mistakes when calculating kJ to kWh
- Using different Btu definitions: this tool uses the International Table Btu of 1,055.05585262 J.
- Dividing when you should multiply: from kJ to kWh multiply by 0.0002777778; from kWh to kJ divide by 0.0002777778.
kJ to kWh FAQ
How many kWh are in 1 kJ?
1 kJ equals 0.0002777778 kWh.
How many kJ are in 1 kWh?
1 kWh equals 3,600 kJ.
Is 1 kJ = 0.0002777778 kWh an exact conversion?
Yes. The kilojoule and the kilowatt hour are both defined exactly in SI terms, so the ratio has no measurement uncertainty; 0.0002777778 is just that ratio shown to 7 significant figures.
What is a kilowatt hour (kWh)?
Energy used by a 1 kW device in one hour, exactly 3.6 MJ.
How can I estimate kJ to kWh in my head?
Quick estimate: multiply by about 0.00028 to get kWh from kJ; this is within 0.8% of the exact factor.
What is 40 kJ in kWh?
40 kJ = 0.01111111 kWh (since 40 × 0.0002777778).
What is 200 kJ in kWh?
200 kJ = 0.05555556 kWh (since 200 × 0.0002777778).
What is 3 kJ in kWh?
3 kJ = 0.0008333333 kWh (since 3 × 0.0002777778).
How many decimals should I keep when converting kJ to kWh?
Match the precision of your original measurement. For example, 0.002777778 kWh rounds to 0.00278 kWh at 3 significant figures; keep more digits only for engineering or scientific work.
More in Energy converters
- kWh to Joules Converter
- kJ to Calories Converter
- kWh to Kilocalories Converter
- kJ to BTU Converter
- Kilocalories to kWh Converter
- BTU to Calories Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors