The kilowatt-hour
The kilowatt-hour (kWh) equals exactly 3,600,000 joules — the unit on every household electricity bill. One kWh runs a 1,000 W appliance for one hour.
Kilowatt-hours to Joules Converter
1 kWh = 3600000 J (kilowatt-hour → joule)
1 kWh = 3600000 J
1 kilowatt-hour equals 3600000 joules. To convert kilowatt-hours to joules, multiply the kilowatt-hour value by 3600000. For quick reference: 1 kWh = 3600000 J, 5 kWh = 18000000 J, 10 kWh = 36000000 J, 100 kWh = 360000000 J.
Formula
Joules = Kilowatt-hours × 3600000Quick
When to use kilowatt-hours → joules
Kilowatt-hours to joules multiplies by 3 600 000 (1 kWh = 1000 W × 3600 s). A 10 kWh home battery stores 36 MJ. Electricity bills quote kWh because the numbers stay tidy at household scale; physics problems convert to joules so the units cancel cleanly with watts and seconds. A 1 kWh oven cycle equals roughly 860 kcal of heat — about a heavy meal's worth of energy.
Automotive crash-test engineers occasionally set a vehicle's kinetic energy at impact, calculated in joules from mass and speed, against the kilowatt-hours of battery energy an EV variant of the same model carries, to illustrate the very different energy scales in a collision versus a full charge. A car's 10 kWh worth of stored battery energy is 36,000,000 J — roughly the kinetic energy of a loaded truck at highway speed — a comparison used mainly to give non-engineers an intuitive sense of just how much energy a modern EV battery actually holds.
How to convert kilowatt-hours to joules
Take your value
Start with your value in kilowatt-hours.
Multiply by 3600000
Multiply the kilowatt-hour value by 3600000. This is the exact conversion factor from kilowatt-hours to joules.
Read the result
The product is your value in joules. For example, 5 kWh × 3600000 = 18000000 J.
Conversion formula
The exact factor from kilowatt-hours to joules is 3600000.
Joules = Kilowatt-hours × 3600000
Kilowatt-hours to Joules conversion table
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Kilowatt-hours (kWh) | Joules (J) |
|---|---|
| 0.001 kWh | 3600 J |
| 0.01 kWh | 36000 J |
| 0.1 kWh | 360000 J |
| 0.5 kWh | 1800000 J |
| 1 kWh | 3600000 J |
| 1.5 kWh | 5400000 J |
| 2 kWh | 7200000 J |
| 5 kWh | 18000000 J |
| 10 kWh | 36000000 J |
| 20 kWh | 72000000 J |
| 50 kWh | 180000000 J |
| 100 kWh | 360000000 J |
| 200 kWh | 720000000 J |
| 250 kWh | 900000000 J |
| 500 kWh | 1800000000 J |
| 1000 kWh | 3600000000 J |
| 2000 kWh | 7200000000 J |
| 2500 kWh | 9000000000 J |
| 3600 kWh | 12960000000 J |
| 5000 kWh | 18000000000 J |
| 7500 kWh | 27000000000 J |
| 10000 kWh | 36000000000 J |
| 25000 kWh | 90000000000 J |
| 50000 kWh | 180000000000 J |
| 100000 kWh | 360000000000 J |
| 250000 kWh | 900000000000 J |
| 500000 kWh | 1800000000000 J |
| 1000000 kWh | 3600000000000 J |
| 2000000 kWh | 7200000000000 J |
| 3600000 kWh | 12960000000000 J |
| 5000000 kWh | 18000000000000 J |
| 10000000 kWh | 36000000000000 J |
| 25000000 kWh | 90000000000000 J |
| 50000000 kWh | 180000000000000 J |
| 100000000 kWh | 360000000000000 J |
| 250000000 kWh | 900000000000000 J |
| 500000000 kWh | 1.8000 × 10^15 J |
| 1000000000 kWh | 3.6000 × 10^15 J |
| 2000000000 kWh | 7.2000 × 10^15 J |
| 5000000000 kWh | 1.8000 × 10^16 J |
| 10000000000 kWh | 3.6000 × 10^16 J |
| 20000000000 kWh | 7.2000 × 10^16 J |
| 50000000000 kWh | 1.8000 × 10^17 J |
| 100000000000 kWh | 3.6000 × 10^17 J |
| 1000000000000 kWh | 3.6000 × 10^18 J |
| 10000000000000 kWh | 3.6000 × 10^19 J |
| 100000000000000 kWh | 3.6000 × 10^20 J |
| 1000000000000000 kWh | 3.6000 × 10^21 J |
| 10000000000000000 kWh | 3.6000 × 10^22 J |
| 100000000000000000 kWh | 3.6000 × 10^23 J |
Real-world reference
A US household uses about 30 kWh of electricity per day. A modern electric vehicle has a 50–100 kWh battery. In joules, that gives you: 1 kWh = 3600000 J, 10 kWh = 36000000 J, 100 kWh = 360000000 J.
Frequently asked questions
- How many joules are in 1 kilowatt-hour?
- 1 kilowatt-hour equals 3600000 joules.
- How do I convert kilowatt-hours to joules?
- Multiply the kilowatt-hour value by 3600000. So x kWh × 3600000 = the equivalent in J.
- What is 5 kilowatt-hours in joules?
- 5 kilowatt-hours equals 18000000 joules.
- What is 10 kilowatt-hours in joules?
- 10 kilowatt-hours equals 36000000 joules.
- What is 100 kilowatt-hours in joules?
- 100 kilowatt-hours equals 360000000 joules.
- How do I convert back from joules to kilowatt-hours?
- Multiply the joule value by 2.7778 × 10^−7. For example, 1 J = 2.7778 × 10^−7 kWh.
- Is the kilowatt-hour bigger than the joule?
- Yes. 1 kilowatt-hour is larger than 1 joule — specifically 3600000 times larger.
- Are these conversion factors exact?
- The factor is derived directly from the SI definitions of kilowatt-hour and joule; the displayed value is rounded for readability, and the browser computes using IEEE 754 double-precision arithmetic.
About the kilowatt-hour and the joule
The joule
The joule (J) is the SI derived unit of energy, work, and heat — defined as the energy transferred when a force of one newton acts over one meter. The joule is the standard unit in physics, chemistry, and most modern engineering documentation.