How many joules are in one kWh?
One kilowatt-hour equals exactly 3,600,000 joules.
Convert Joule (J) to Kilowatt-hour (kWh) instantly.
Formula
value × 2.777778e-7
| Sample | Converted |
|---|---|
| 1 J | 0 kWh |
| 5 J | 0.000001 kWh |
| 10 J | 0.000003 kWh |
| 100 J | 0.000028 kWh |
| 1,000 J | 0.000278 kWh |
Convert joules to kilowatt-hours by dividing the joule value by 3,600,000. This is useful when large energy calculations need to be compared with electricity billing, appliances, or grid-scale energy use.
Joules are the SI unit for energy, while kWh is the unit many people recognize from electricity use and billing.
This conversion uses 3.6 million joules per kilowatt-hour.
A value of 36,000,000 J becomes 10 kWh.
Use kWh for appliances, utility bills, battery capacity, solar production, and larger electrical-energy totals.
Use joules or kilojoules when the context is physics, mechanics, lab work, or short-duration calculations.
Do not confuse kWh with kW; one is energy and the other is power.
Large joule values can be hard to interpret for everyday electricity use.
kWh is familiar from utility bills, appliances, batteries, and solar production.
Converting joules to kWh makes large energy totals easier to compare with real electrical usage.
One kilowatt is 1000 watts.
One hour is 3600 seconds.
Because one watt is one joule per second, one kWh equals 3,600,000 J.
Utility bills commonly charge energy in kWh.
A joule value must be converted before it can be compared with that billing unit.
For cost estimates, multiply the kWh result by the applicable rate separately.
Definition: A joule is the SI unit of energy, work, and heat.
History/Origin: The joule became the standard SI unit for energy and work, named after James Prescott Joule.
Current use: J is used in physics, engineering, electricity, mechanics, thermodynamics, chemistry, and energy calculations.
Definition: A kilowatt-hour is an energy unit equal to one kilowatt of power used for one hour.
History/Origin: Kilowatt-hours became the standard practical unit for metered electrical energy use.
Current use: kWh is used in utility bills, appliance energy use, solar production, battery storage, electric vehicles, and grid energy reporting.
| Joule [J] | Kilowatt-hour [kWh] |
|---|---|
| 0.01 J | 2.777778e-9 kWh |
| 0.1 J | 2.777778e-8 kWh |
| 1 J | 0 kWh |
| 2 J | 0.000001 kWh |
| 5 J | 0.000001 kWh |
| 10 J | 0.000003 kWh |
| 20 J | 0.000006 kWh |
| 50 J | 0.000014 kWh |
| 100 J | 0.000028 kWh |
1 J = 0 kWh
1 kWh = 3,600,000 J
Formula: value × 2.777778e-7
Example: 15 J = 0.000004 kWh
Precision note: Use exactly 3,600,000 J per kWh. Preserve decimals when energy totals are used for billing or storage estimates.
One kilowatt-hour equals exactly 3,600,000 joules.
7,200,000 J equals 2 kWh.
kWh is energy. Kilowatt is power; kilowatt-hour includes time.