How do I convert kilowatt-hours back to joules?

Use the reverse converter: 1 kilowatt-hour equals 3600000 J.

Is this converter accurate?

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert joules to kilowatt-hours, multiply the value by 2.77777778e-7.

kWh = J × 2.77777778e-7

40 J × 2.77777778e-7 = 0.00001111 kWh

Joule (J): The SI unit of energy, one newton-metre, named after James Prescott Joule.
Kilowatt-hour (kWh): The unit on household electricity bills. Equal to 3.6 megajoules.

How do I convert joules to kilowatt-hours?: To convert joules to kilowatt-hours, multiply the value by 2.77777778e-7.
How many kilowatt-hours are in 1 joule?: 1 joule equals 2.77778e-7 kWh.
How many kilowatt-hours are in 10 joules?: 10 J equals 0.00000277778 kWh.
How do I convert kilowatt-hours back to joules?: Use the reverse converter: 1 kilowatt-hour equals 3600000 J.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.