kWh ↔ Joules
Convert between kilowatt-hours and joules
kWh ↔ Joules
Quick Facts
- •1 kWh = 3,600,000 joules
- •Average US electricity: ~$0.16/kWh
- •1 kWh runs a 100W bulb for 10 hours
- •Average US home uses ~900 kWh/month
kWh and Joules Explained
A kilowatt-hour (kWh) is the standard unit for measuring electrical energy consumption on utility bills. One kWh equals 3,600,000 joules (3.6 megajoules). The joule is the SI unit of energy. Your electricity bill charges per kWh — the average US household uses about 900 kWh per month.
Practical Examples
Running a 100W light bulb for 10 hours uses 1 kWh. A typical washing machine cycle uses about 0.5 kWh. An electric car uses roughly 30 kWh per 100 miles. Understanding kWh helps you estimate electricity costs and compare appliance efficiency.
How to convert Kilowatt-hours to Joules
To convert kilowatt-hours to joules, multiply the number of kilowatt-hours by the conversion factor. The exact factor is 3600000.
Formula
Joules = Kilowatt-hours × 3600000
Worked example
Convert 10 kWh to J: 10 kWh = 36,000,000 J.
Kilowatt-hours to Joules reference table
Use this quick lookup for common kilowatt-hours to joules values.
| Kilowatt-hours (kWh) | Joules (J) |
|---|---|
| 1 kWh | 3,600,000 J |
| 2 kWh | 7,200,000 J |
| 5 kWh | 18,000,000 J |
| 10 kWh | 36,000,000 J |
| 20 kWh | 72,000,000 J |
| 25 kWh | 90,000,000 J |
| 50 kWh | 180,000,000 J |
| 75 kWh | 270,000,000 J |
| 100 kWh | 360,000,000 J |
| 250 kWh | 900,000,000 J |
Frequently asked questions
What is the formula to convert Kilowatt-hours to Joules?
Multiply the number of kilowatt-hours by 3600000 to get joules. For example, 10 kWh equals 36,000,000 J.
How many joules are in 1 kilowatt-hour?
1 kWh equals 3,600,000 J.
How do I convert joules back to kilowatt-hours?
Reverse the formula: Kilowatt-hours = Joules ÷ 3600000. For example, 100 J equals 0.000028 kWh.
Is this Kilowatt-hours to Joules converter accurate?
Yes. Conversions use the internationally accepted ratio for kilowatt-hours and joules and are calculated to 6 decimal places in your browser.
What is 10 kWh in J?
10 kWh equals 36,000,000 J.
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This calculator is for educational and reference purposes only. Always verify critical calculations independently.