Joules to Kilowatt-hours Converter

One Joule equals 2.777778e-7 Kilowatt-hours (1 J = 2.777778e-7 kWh). Multiply a Joule value by 2.777778e-7 to get the equivalent in Kilowatt-hours. Enter a value above to calculate the result. You can also use the formula and reference table below.

Formula

kWh = J × 2.777778e-7

Multiply the Joule value by 2.777778e-7 to get the equivalent value in Kilowatt-hours.

Example Conversions

1 Joule (J)

2.777778e-7 Kilowatt-hour (kWh)

5 Joule (J)

0.000001388888889 Kilowatt-hour (kWh)

10 Joule (J)

0.000002777777778 Kilowatt-hour (kWh)

25 Joule (J)

0.000006944444444 Kilowatt-hour (kWh)

100 Joule (J)

0.00002777777778 Kilowatt-hour (kWh)

Conversion Table

Common conversion values from Joule to Kilowatt-hour
Joule (J)Kilowatt-hour (kWh)
0.12.777778e-8
0.51.388889e-7
12.777778e-7
25.555556e-7
50.000001388888889
100.000002777777778
250.000006944444444
500.00001388888889
1000.00002777777778
2500.00006944444444
5000.0001388888889
10000.0002777777778

How to Convert Manually

Use these steps to convert Joule values to Kilowatt-hour without the calculator.

  1. Write down the value in Joule (J) that you want to convert.
  2. Multiply that value by 2.777778e-7.
  3. For example, 10 Joules × 2.777778e-7 = 0.000002777777778 Kilowatt-hours.
  4. Label the result as Kilowatt-hour (kWh).

Relative Size Comparison

1 Joule
1 Kilowatt-hour3600000 Joules
1 kWh

This chart shows the visual difference in size between exactly one Joule and one Kilowatt-hour.

About Joule and Kilowatt-hour

The joule is the SI derived unit of energy, the work done by a force of one newton over one meter. Physics, chemistry, and food labeling outside the US build on it. The kilowatt-hour is exactly 3.6 megajoules. It is the unit on your electricity bill. Household consumption and electric vehicle battery sizes are stated in kilowatt-hours. One Joule equals 2.777778e-7 Kilowatt-hours (1 J = 2.777778e-7 kWh). Joule is used in physics and engineering calculations and in food energy labeling outside the US. Kilowatt-hour is used in electricity billing.

Precision and Rounding:Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15Joules equals0.000004166666667Kilowatt-hours.

15 J × 2.777778e-7 = 0.000004166666667 kWh

FAQ

How do I convert Joule to Kilowatt-hour?

Multiply the Joule value by 2.777778e-7 to get the equivalent value in Kilowatt-hours.

What is the formula for Joule to Kilowatt-hour?

The formula is kWh = J × 2.777778e-7.

How many Kilowatt-hours are in 1 Joule?

1 Joule equals 2.777778e-7 Kilowatt-hours.

Can I convert Kilowatt-hour back to Joule?

Yes. 1 Kilowatt-hour equals 3600000 Joules, and the related converter can reverse the calculation.

What are common names for Joule and Kilowatt-hour?

Joule is shown as J and may also be searched as joule, joules. Kilowatt-hour is shown as kWh and may also be searched as kilowatt hour, kilowatt-hour, kwh.

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