How many joules are in one kilowatt-hour?

There are 3,600,000 joules in 1 kilowatt-hour.

How do you convert joules to kilowatt-hours?

Multiply the number of joules by 0.000000278 — or use the formula kWh = J ÷ 3,600,000.

What is 6 joules in kilowatt-hours?

6 joules is 0.000001667 kilowatt-hours. 6 ÷ 3,600,000 = 0.000001667 kilowatt-hours.

Is the joules to kilowatt-hours conversion exact?

Yes. The relationship is fixed by definition, so 0.000000277778 is an exact conversion factor — only the displayed result is rounded.

Joules to Kilowatt-hours Converter

Convert joules to kilowatt-hours instantly with this free joules to kilowatt-hours converter. Enter any value to get an accurate energy conversion, plus the formula, the conversion factor and a full reference table.

What is 1 joule in kilowatt-hours?

1 joule is equal to 0.000000278 kilowatt-hours.

1 ÷ 3,600,000 = 0.000000278 kilowatt-hours

Amount

Result0.0000002778

1 joule = 0.0000002778 kilowatt-hours

Joules to Kilowatt-hours formula

kWh = J ÷ 3,600,000

The joules to kilowatt-hours conversion factor is 0.000000277778, which is exact by definition. 1 joule = 0.000000277778 kilowatt-hours, and 1 kilowatt-hour = 3,600,000 joules.

Worked examples

2 joules = 0.000000556 kilowatt-hours — 2 ÷ 3,600,000 = 0.000000556 kilowatt-hours
6 joules = 0.000001667 kilowatt-hours — 6 ÷ 3,600,000 = 0.000001667 kilowatt-hours
10 joules = 0.000002778 kilowatt-hours — 10 ÷ 3,600,000 = 0.000002778 kilowatt-hours

Joules to Kilowatt-hours conversion table

Every value below is calculated with the exact conversion factor and rounded for display.

joules to kilowatt-hours conversion table
Joules (J)	Kilowatt-hours (kWh)
1 J	0.00000028 kWh
2 J	0.00000056 kWh
3 J	0.00000083 kWh
4 J	0.00000111 kWh
5 J	0.00000139 kWh
6 J	0.00000167 kWh
7 J	0.00000194 kWh
8 J	0.00000222 kWh
9 J	0.0000025 kWh
10 J	0.00000278 kWh
12 J	0.00000333 kWh
15 J	0.00000417 kWh
20 J	0.00000556 kWh
25 J	0.00000694 kWh
30 J	0.00000833 kWh
50 J	0.00001389 kWh
75 J	0.00002083 kWh
100 J	0.00002778 kWh
500 J	0.00013889 kWh
1,000 J	0.00027778 kWh

When you need to convert joules to kilowatt-hours

Comparing food energy labelled in calories with labels in kilojoules.
Reading utility bills and appliance ratings that mix kWh, joules and BTU.

Common mistakes to avoid

Dividing when you should multiply. Because 1 joule = 0 kilowatt-hours, the answer should be smaller than the number you started with.
Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.

How precise does the answer need to be?

Round only at the end, and only to the precision your task actually needs. The converter above keeps full double precision internally and rounds for display.

How these units are defined

Joule (J): The SI unit of energy: one newton-meter. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
Kilowatt-hour (kWh): The billing unit for household electricity. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.

Frequently asked questions

What is 1 joule in kilowatt-hours?: 1 joule is equal to 0.000000278 kilowatt-hours.
How many joules are in one kilowatt-hour?: There are 3,600,000 joules in 1 kilowatt-hour.
How do you convert joules to kilowatt-hours?: Multiply the number of joules by 0.000000278 — or use the formula kWh = J ÷ 3,600,000.
What is 6 joules in kilowatt-hours?: 6 joules is 0.000001667 kilowatt-hours. 6 ÷ 3,600,000 = 0.000001667 kilowatt-hours.
Is the joules to kilowatt-hours conversion exact?: Yes. The relationship is fixed by definition, so 0.000000277778 is an exact conversion factor — only the displayed result is rounded.