Kilowatt-hours to Joules
One kilowatt-hour equals 3600000 joules.
Joules = kilowatt-hours × 3600000
By Piero Nanni · Last checked
Kilowatt-hours to Joules Calculator
Common Conversions
How to Convert Kilowatt-hours to Joules
Formula:
Joules = kilowatt-hours × 3600000
Worked example:
15 kilowatt-hours × 3600000 = 54000000 joules
Kilowatt-hours to Joules Conversion Table
| kWh | J |
|---|---|
| 0.1 | 360000 |
| 0.2 | 720000 |
| 0.25 | 900000 |
| 0.5 | 1800000 |
| 0.75 | 2700000 |
| 1 | 3600000 |
| 2 | 7200000 |
| 2.5 | 9000000 |
| 3 | 10800000 |
| 5 | 18000000 |
| 7.5 | 27000000 |
| 10 | 36000000 |
| 15 | 54000000 |
| 20 | 72000000 |
| 25 | 90000000 |
| 50 | 180000000 |
| 75 | 270000000 |
| 100 | 360000000 |
| 200 | 720000000 |
| 250 | 900000000 |
| 500 | 1800000000 |
| 750 | 2700000000 |
| 1000 | 3600000000 |
About This Conversion
Kilowatt-hours to joules multiplies by 3,600,000. A kilowatt-hour is one kilowatt sustained for one hour, and since a watt is a joule per second, an hour of it is 1,000 × 3,600 joules.
This is the unit electricity is billed in, so it is the bridge between a utility bill and any physics or engineering calculation. A 2 kW heater run for three hours uses 6 kWh, which is 21.6 megajoules, and at a tariff of 25 cents per kWh that is 1.50 in whatever currency the bill is in.
Frequently Asked Questions
How many joules is 1 kWh?
One kilowatt-hour is 3,600,000 joules, or 3.6 megajoules.
How many joules is a watt-hour?
One watt-hour is 3,600 joules.
How much energy does a 2 kW heater use in 3 hours?
6 kWh, which is 21.6 megajoules.
Why is a kilowatt-hour not a kilowatt?
A kilowatt is a rate of energy use; a kilowatt-hour is the amount used when that rate runs for one hour.