Kilowatt-hours to Joules Converter
Convert kilowatt-hours to joules instantly with this free kilowatt-hours to joules converter. Enter any value to get an accurate energy conversion, plus the formula, the conversion factor and a full reference table.
What is 1 kilowatt-hour in joules?
1 kilowatt-hour is equal to exactly 3,600,000 joules.
1 × 3,600,000 = 3,600,000 joules
1 kilowatt-hour = 3,600,000 joules
Kilowatt-hours to Joules formula
J = kWh × 3,600,000
The kilowatt-hours to joules conversion factor is 3,600,000, which is exact by definition. 1 kilowatt-hour = 3,600,000 joules, and 1 joule = 0.000000277778 kilowatt-hours.
Worked examples
- 2 kilowatt-hours = 7,200,000 joules — 2 × 3,600,000 = 7,200,000 joules
- 6 kilowatt-hours = 21,600,000 joules — 6 × 3,600,000 = 21,600,000 joules
- 10 kilowatt-hours = 36,000,000 joules — 10 × 3,600,000 = 36,000,000 joules
Kilowatt-hours to Joules conversion table
Every value below is calculated with the exact conversion factor and rounded for display.
| Kilowatt-hours (kWh) | Joules (J) |
|---|---|
| 1 kWh | 3,600,000 J |
| 2 kWh | 7,200,000 J |
| 3 kWh | 10,800,000 J |
| 4 kWh | 14,400,000 J |
| 5 kWh | 18,000,000 J |
| 6 kWh | 21,600,000 J |
| 7 kWh | 25,200,000 J |
| 8 kWh | 28,800,000 J |
| 9 kWh | 32,400,000 J |
| 10 kWh | 36,000,000 J |
| 12 kWh | 43,200,000 J |
| 15 kWh | 54,000,000 J |
| 20 kWh | 72,000,000 J |
| 25 kWh | 90,000,000 J |
| 30 kWh | 108,000,000 J |
| 50 kWh | 180,000,000 J |
| 75 kWh | 270,000,000 J |
| 100 kWh | 360,000,000 J |
| 500 kWh | 1,800,000,000 J |
| 1,000 kWh | 3,600,000,000 J |
When you need to convert kilowatt-hours to joules
- Comparing food energy labelled in calories with labels in kilojoules.
- Reading utility bills and appliance ratings that mix kWh, joules and BTU.
Common mistakes to avoid
- Dividing when you should multiply. Because 1 kilowatt-hour = 3,600,000 joules, the answer should be larger than the number you started with.
- Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.
How precise does the answer need to be?
Round only at the end, and only to the precision your task actually needs. The converter above keeps full double precision internally and rounds for display.
How these units are defined
- Kilowatt-hour (kWh): The billing unit for household electricity. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
- Joule (J): The SI unit of energy: one newton-meter. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
Related conversions
Frequently asked questions
- What is 1 kilowatt-hour in joules?
- 1 kilowatt-hour is equal to 3,600,000 joules.
- How many kilowatt-hours are in one joule?
- There are 0.000000278 kilowatt-hours in 1 joule.
- How do you convert kilowatt-hours to joules?
- Multiply the number of kilowatt-hours by 3,600,000 — or use the formula J = kWh × 3,600,000.
- What is 6 kilowatt-hours in joules?
- 6 kilowatt-hours is 21,600,000 joules. 6 × 3,600,000 = 21,600,000 joules.
- Is the kilowatt-hours to joules conversion exact?
- Yes. The relationship is fixed by definition, so 3,600,000 is an exact conversion factor — only the displayed result is rounded.