Kilowatt-hours to Kilojoules Converter
kWh → kJ · ⚡ Energy
1 Kilowatt-hours = 3,600 Kilojoules
How to convert Kilowatt-hours to Kilojoules
To convert Kilowatt-hours to Kilojoules, multiply the value in Kilowatt-hours by 3,600. For example, 5 kWh = 18,000 kJ.
The Kilowatt-hours-to-Kilojoules conversion comes up often in everyday and professional contexts alike. With 1 kWh equal to 3,600 kJ, you can use the tool above for any value, or scan the table below for the most common Kilowatt-hours amounts and their Kilojoules equivalents.
Energy conversions appear in nutrition, fitness, physics, utility bills, and engineering. The same quantity of energy can be expressed in joules, calories, kilowatt-hours, or BTU depending on the context.
Understanding Kilowatt-hours and Kilojoules
The joule is the SI unit, but everyday contexts use others: food labels use kilocalories (often just called 'calories'), electricity bills use kilowatt-hours, and heating and cooling systems use BTU (British Thermal Units). One food calorie is actually a kilocalorie — 1,000 of the small physics calories — which is a frequent source of confusion.
How accurate is this conversion?
Energy conversions use standard definitions: 1 calorie = 4.184 joules, 1 kilowatt-hour = 3,600,000 joules, 1 BTU = 1,055.06 joules. These are internationally agreed values, making the conversions exact.
All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.
Quick reference: common Kilowatt-hours to Kilojoules values
The most frequently searched conversions are 1 Kilowatt-hours = 3,600 Kilojoules, 5 Kilowatt-hours = 18,000 Kilojoules, 10 Kilowatt-hours = 36,000 Kilojoules, and 100 Kilowatt-hours = 360,000 Kilojoules. The full table further down covers every common value, and the calculator handles any number you need in between.
Pro tip: When comparing appliance efficiency or heating costs, convert everything to kilowatt-hours first, since that's the unit your utility bill uses — it makes the real-world cost immediately comparable.
Kilowatt-hours to Kilojoules — Conversion Table
| Kilowatt-hours (kWh) | Kilojoules (kJ) |
|---|---|
| 0.1 kWh | 360 kJ |
| 0.25 kWh | 900 kJ |
| 0.5 kWh | 1,800 kJ |
| 1 kWh | 3,600 kJ |
| 2 kWh | 7,200 kJ |
| 5 kWh | 18,000 kJ |
| 10 kWh | 36,000 kJ |
| 25 kWh | 90,000 kJ |
| 50 kWh | 180,000 kJ |
| 100 kWh | 360,000 kJ |
| 250 kWh | 900,000 kJ |
| 500 kWh | 1,800,000 kJ |
| 1000 kWh | 3,600,000 kJ |