How many kilowatt-hours are in a joule?

1 J = 2.7778e-7 kWh. To convert any amount, multiply by 2.7778e-7.

How do you convert joules to kilowatt-hours?

Multiply the number of joules by 2.7778e-7 to get kilowatt-hours. 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

Joules to kilowatt-hours converter

Convert joules (J) to kilowatt-hours (kWh). 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 joules to kilowatt-hours— the formula

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

kWh = J × 2.7778e-7

J = kWh × 3600000

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 kilowatt-hours are in a joule?
1 J = 2.7778e-7 kWh. To convert any amount, multiply by 2.7778e-7.
How do you convert joules to kilowatt-hours?
Multiply the number of joules by 2.7778e-7 to get kilowatt-hours. 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.