1 kilowatt-hour equals exactly
3.600.000 Joules
The kilowatt-hour (kWh) is the unit used on energy bills, defined as the energy delivered by a power of 1 kW for the duration of one hour. Since energy = power × time, and one hour equals 3,600 seconds, one kWh is exactly equal to 1,000 W × 3,600 s = 3,600,000 J.
To convert a measurement from kWh to Joules, simply multiply the value by 3,600,000:
To convert from Joules to kWh, perform the inverse operation, dividing by 3,600,000:
This conversion is useful for translating electricity consumption reported on bills (in kWh) into the official SI unit (Joule), necessary for scientific calculations, broader energy comparisons, or physics exercises requiring dimensional consistency with other system units.