Kilojoules to Watt-Hours Conversion (kJ to Wh)

Kilojoules to Watt-Hours Converter

Enter the energy in kilojoules below to convert it to watt-hours.

Result in Watt-Hours:

1 kJ = 0.277778 Wh

How to Convert Kilojoules to Watt-Hours

To convert a measurement in kilojoules to a measurement in watt-hours, multiply the energy by the following conversion ratio: 0.277778 watt-hours/kilojoule.

Since one kilojoule is equal to 0.277778 watt-hours, you can use this simple formula to convert:

watt-hours = kilojoules × 0.277778

The energy in watt-hours is equal to the energy in kilojoules multiplied by 0.277778.

For example, here's how to convert 5 kilojoules to watt-hours using the formula above.

watt-hours = (5 kJ × 0.277778) = 1.388889 Wh

How Many Watt-Hours Are in a Kilojoule?

There are 0.277778 watt-hours in a kilojoule, which is why we use this value in the formula above.

1 kJ = 0.277778 Wh

Kilojoules and watt-hours are both units used to measure energy. Keep reading to learn more about each unit of measure.

What Is a Kilojoule?

One kilojoule is equal to 1,000 joules, which is the energy equal to the force on an object of one newton at a distance of one meter.

The kilojoule is a multiple of the joule, which is the SI derived unit for energy. In the metric system, "kilo" is the prefix for thousands, or 10³. Kilojoules can be abbreviated as kJ; for example, 1 kilojoule can be written as 1 kJ.

Learn more about kilojoules.

What Is a Watt-Hour?

The watt-hour is a measure of electrical energy equal to one watt of power over a one hour period.

Watt-hours are usually abbreviated as Wh, although the formally adopted expression is W·h. The abbreviation W h is also sometimes used. For example, 1 watt-hour can be written as 1 Wh, 1 W·h, or 1 W h.

In formal expressions, the centered dot (·) or space is used to separate units used to indicate multiplication in an expression and to avoid conflicting prefixes being misinterpreted as a unit symbol.^[1]

Learn more about watt-hours.

Kilojoule to Watt-Hour Conversion Table

Table showing various kilojoule measurements converted to watt-hours.
Kilojoules	Watt-hours
1 kJ	0.277778 Wh
2 kJ	0.555556 Wh
3 kJ	0.833333 Wh
4 kJ	1.1111 Wh
5 kJ	1.3889 Wh
6 kJ	1.6667 Wh
7 kJ	1.9444 Wh
8 kJ	2.2222 Wh
9 kJ	2.5 Wh
10 kJ	2.7778 Wh
11 kJ	3.0556 Wh
12 kJ	3.3333 Wh
13 kJ	3.6111 Wh
14 kJ	3.8889 Wh
15 kJ	4.1667 Wh
16 kJ	4.4444 Wh
17 kJ	4.7222 Wh
18 kJ	5 Wh
19 kJ	5.2778 Wh
20 kJ	5.5556 Wh
21 kJ	5.8333 Wh
22 kJ	6.1111 Wh
23 kJ	6.3889 Wh
24 kJ	6.6667 Wh
25 kJ	6.9444 Wh
26 kJ	7.2222 Wh
27 kJ	7.5 Wh
28 kJ	7.7778 Wh
29 kJ	8.0556 Wh
30 kJ	8.3333 Wh
31 kJ	8.6111 Wh
32 kJ	8.8889 Wh
33 kJ	9.1667 Wh
34 kJ	9.4444 Wh
35 kJ	9.7222 Wh
36 kJ	10 Wh
37 kJ	10.28 Wh
38 kJ	10.56 Wh
39 kJ	10.83 Wh
40 kJ	11.11 Wh

Table showing various kilojoule measurements converted to watt-hours.

Kilojoules

Watt-hours

1 kJ

0.277778 Wh

2 kJ

0.555556 Wh

3 kJ

0.833333 Wh

4 kJ

1.1111 Wh

5 kJ

1.3889 Wh

6 kJ

1.6667 Wh

7 kJ

1.9444 Wh

8 kJ

2.2222 Wh

9 kJ

2.5 Wh

10 kJ

2.7778 Wh

11 kJ

3.0556 Wh

12 kJ

3.3333 Wh

13 kJ

3.6111 Wh

14 kJ

3.8889 Wh

15 kJ

4.1667 Wh

16 kJ

4.4444 Wh

17 kJ

4.7222 Wh

18 kJ

5 Wh

19 kJ

5.2778 Wh

20 kJ

5.5556 Wh

21 kJ

5.8333 Wh

22 kJ

6.1111 Wh

23 kJ

6.3889 Wh

24 kJ

6.6667 Wh

25 kJ

6.9444 Wh

26 kJ

7.2222 Wh

27 kJ

7.5 Wh

28 kJ

7.7778 Wh

29 kJ

8.0556 Wh

30 kJ

8.3333 Wh

31 kJ

8.6111 Wh

32 kJ

8.8889 Wh

33 kJ

9.1667 Wh

34 kJ

9.4444 Wh

35 kJ

9.7222 Wh

36 kJ

10 Wh

37 kJ

10.28 Wh

38 kJ

10.56 Wh

39 kJ

10.83 Wh

40 kJ

11.11 Wh

References

Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf