How many joules are in a kilowatt-hour?

1 kWh = 3600000 J. To convert any amount, multiply by 3600000.

How do you convert kilowatt-hours to joules?

Multiply the number of kilowatt-hours by 3600000 to get joules. The formula is shown in the "How it's calculated" section above.

Where does the conversion factor come from?

It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.

Unit converter — Energy

Kilowatt-hours to joules converter

Convert kilowatt-hours (kWh) to joules (J). Source-cited conversion factor, exact to the displayed precision.

Results are mathematically exact for the displayed precision. How we calculate.

How it's calculated

Convert kilowatt-hours to joules— the formula

Kilowatt-hours convert to joules by multiplying by the published conversion factor. The factor below is exact to the precision shown, sourced from the citation under the formula.

J = kWh × 3600000

kWh = J × 2.7778e-7

Joule: SI derived. 1 cal (thermochemical) = 4.184 J exactly; 1 kcal = 1000 cal. 1 kWh = 3,600,000 J exactly. 1 BTU (IT) = 1055.05585262 J (NIST SP 811).

Questions

Frequently asked questions

How many joules are in a kilowatt-hour?
1 kWh = 3600000 J. To convert any amount, multiply by 3600000.
How do you convert kilowatt-hours to joules?
Multiply the number of kilowatt-hours by 3600000 to get joules. The formula is shown in the "How it's calculated" section above.
Where does the conversion factor come from?
It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.