Kilowatt-hour to Kilojoule Converter
Enter the value that you want to convert kilowatt-hour (kW/h) to kilojoule (kJ) or kilojoule to kilowatt-hour.Also written as KW/H to KJ conversion.
1 kilowatt-hour = 3600.0000000 kilojoule
Formula: kilojoule = kilowatt-hour value × 3600.0000000
KW/H to KJ — kilowatt-hour to kilojoule
10 kilowatt-hour = 36000.00000 kilojoule
Popular Energy Converters:
Kilowatt-hour vs Kilojoule
What is Kilowatt-hour?
Kilowatt-hour (kW/h) is a unit of energy measurement. 1 kilowatt-hour is equal to 3600.0000000 kilojoule.
About the Kilojoule
Kilojoule (kJ) is a unit of energy measurement. 1 kilojoule is equal to 0.0002778 kilowatt-hour.
Energy Units in Different Fields
Energy measurement units reflect their historical origins across different industries. Electrical engineers use kilowatt-hours, nutritionists use calories, physicists use joules, heating engineers use BTUs, and the petroleum industry uses barrels of oil equivalent. Converting between these units is essential for energy auditing, comparing fuel sources, sizing HVAC systems, and understanding electricity bills relative to gas consumption.
kilowatt-hour to kilojoule metric conversion table
| 0.01 kW/h | = | 36.00000 kJ |
| 0.1 kW/h | = | 360.00000 kJ |
| 1 kW/h | = | 3600.00000 kJ |
| 2 kW/h | = | 7200.00000 kJ |
| 3 kW/h | = | 10800.00000 kJ |
| 4 kW/h | = | 14400.00000 kJ |
| 5 kW/h | = | 18000.00000 kJ |
| 6 kW/h | = | 21600.00000 kJ |
| 7 kW/h | = | 25200.00000 kJ |
| 8 kW/h | = | 28800.00000 kJ |
| 9 kW/h | = | 32400.00000 kJ |
| 10 kW/h | = | 36000.00000 kJ |
| 11 kW/h | = | 39600.00000 kJ |
| 12 kW/h | = | 43200.00000 kJ |
| 13 kW/h | = | 46800.00000 kJ |
| 14 kW/h | = | 50400.00000 kJ |
| 15 kW/h | = | 54000.00000 kJ |
| 16 kW/h | = | 57600.00000 kJ |
| 17 kW/h | = | 61200.00000 kJ |
| 18 kW/h | = | 64800.00000 kJ |
| 19 kW/h | = | 68400.00000 kJ |
| 20 kW/h | = | 72000.00000 kJ |
| 30 kW/h | = | 108000.00000 kJ |
| 40 kW/h | = | 144000.00000 kJ |
| 50 kW/h | = | 180000.00000 kJ |
| 60 kW/h | = | 216000.00000 kJ |
| 70 kW/h | = | 252000.00000 kJ |
| 80 kW/h | = | 288000.00000 kJ |
| 90 kW/h | = | 324000.00000 kJ |
| 100 kW/h | = | 360000.00000 kJ |
| 200 kW/h | = | 720000.00000 kJ |
| 300 kW/h | = | 1080000.00000 kJ |
| 400 kW/h | = | 1440000.00000 kJ |
| 500 kW/h | = | 1800000.00000 kJ |
| 600 kW/h | = | 2160000.00000 kJ |
| 700 kW/h | = | 2520000.00000 kJ |
| 800 kW/h | = | 2880000.00000 kJ |
| 900 kW/h | = | 3240000.00000 kJ |
| 1000 kW/h | = | 3600000.00000 kJ |
How to Convert KW/H to KJ (Kilowatt-hour to Kilojoule)?
We can convert kilowatt-hour to kilojoule by using an example.
Example:
Convert 20 Kilowatt-hour to Kilojoule?
We know 1 Kilowatt-hour = 3600.0000000 kilojoule; 1 Kilojoule = 0.0002778 kilowatt-hour.
20 kilowatt-hour = ___kJ
20 × 3600.0000000 = 72000.00000 kJ (we know 1 kilowatt-hour = 3600.0000000 kilojoule)
Answer:
20 kilowatt-hour = 72000.00000 kilojoule
How to Convert Kilowatt-Hours to Kilojoules (Step-by-Step)
Converting kWh to kJ is straightforward since both are metric energy units at the "kilo" scale. The exact conversion is 1 kWh = 3600 kJ. This is commonly needed in energy engineering, thermodynamics courses, and comparing electrical and thermal energy systems.
- Identify the energy value in kilowatt-hours.
- Multiply by 3600 to convert to kilojoules.
- This comes from: 1 kWh = 1 kW × 1 hr = 1 kJ/s × 3600 s = 3600 kJ.
- Express result in MJ if the number exceeds a few thousand kJ.
Common kWh to kJ Conversions
Reference values for electricity consumption expressed in kilojoules.
| Kilowatt-hour | Kilojoule |
|---|---|
| 0.01 kWh | 36 kJ |
| 0.1 kWh | 360 kJ |
| 0.5 kWh | 1,800 kJ |
| 1 kWh | 3,600 kJ |
| 5 kWh | 18,000 kJ |
| 10 kWh | 36,000 kJ |
| 30 kWh | 108,000 kJ |
Solved Examples: kWh to kJ
Question 1: A heat pump delivers 4.2 kWh of heating energy. Express in kJ.
Solution:
Start with 4.2 kWh.
Multiply by 3600: 4.2 × 3600 = 15,120 kJ.
Answer: 4.2 kWh = 15,120 kJ
Question 2: Your electricity bill shows 750 kWh for the month. Convert to kJ and MJ.
Solution:
Start with 750 kWh.
Multiply by 3600: 750 × 3600 = 2,700,000 kJ.
Convert to MJ: 2,700,000 ÷ 1000 = 2,700 MJ.
Answer: 750 kWh = 2,700,000 kJ = 2,700 MJ
Question 3: A battery stores 0.25 kWh. How many kJ is that?
Solution:
Start with 0.25 kWh.
Multiply by 3600: 0.25 × 3600 = 900 kJ.
Answer: 0.25 kWh = 900 kJ
Practice: kWh to kJ
Try solving these on your own to test your understanding:
- Convert 2 kWh to kJ. (Answer: 7,200 kJ)
- A solar panel produces 6.5 kWh in a day. Express in kJ. (Answer: 23,400 kJ)
- Convert 0.05 kWh to kJ. (Answer: 180 kJ)
- An industrial motor uses 50 kWh per shift. Convert to MJ. (Answer: 180 MJ)
- Convert 1.5 kWh to kJ. (Answer: 5,400 kJ)
Comparing Electrical and Thermal Energy in kJ
Using kJ as a common unit allows direct comparison of electrical and thermal energy. A 1500W space heater running for 1 hour uses 1.5 kWh = 5,400 kJ of electricity. If it is 100% efficient (like a resistance heater), it delivers 5,400 kJ of heat. A heat pump with COP of 3.0 would deliver 16,200 kJ of heat from the same electricity. This comparison is fundamental to energy efficiency analysis.
Energy Units in Thermodynamics Textbooks
Thermodynamics courses frequently require converting between kWh and kJ. Power plant problems often state turbine output in MW (= MJ/s = kJ/ms), while overall energy production is given in kWh or MWh. A 1 GW power plant running for 1 hour produces 1 GWh = 3,600,000 MJ = 3.6 × 10⁹ kJ. Understanding these relationships is essential for engineering problem sets.
Key Takeaways
- Multiply kWh by 3600 to get kJ (exact conversion).
- The factor 3600 equals the number of seconds in one hour.
- 1 kWh = 3600 kJ = 3.6 MJ — a key relationship in energy engineering.
- Both units are commonly used in thermodynamics and energy analysis.
- For monthly electricity (e.g., 900 kWh), express in MJ: 900 × 3.6 = 3240 MJ.
- Quick check: kJ should always be 3600× larger than the kWh value.
Kilowatt-hour to Kilojoule Conversion Formula
kilojoule = kilowatt-hour × 3600.0000000
1 kilowatt-hour = 3600.0000000 kilojoule
1 kilojoule = 0.0002778 kilowatt-hour
Reverse: kilowatt-hour = kilojoule × 0.0002778
Frequently Asked Questions
How many kilojoule are in 1 kilowatt-hour?
There are 3600.0000000 kilojoule in 1 kilowatt-hour. To convert kilowatt-hour to kilojoule, multiply the value by 3600.0000000.
How do I convert kilowatt-hour to kilojoule?
Multiply your kilowatt-hour value by 3600.0000000 to get the equivalent in kilojoule. For example, 5 kilowatt-hour = 5 × 3600.0000000 = 18000.00000 kilojoule.
How do I convert kilojoule to kilowatt-hour?
Multiply your kilojoule value by 0.0002778 to get the equivalent in kilowatt-hour. Alternatively, divide by 3600.0000000.
What is 10 kilowatt-hour in kilojoule?
10 kilowatt-hour is equal to 36000.00000 kilojoule.
What is 100 kilowatt-hour in kilojoule?
100 kilowatt-hour is equal to 360000.00000 kilojoule.