Joule/Second to Kilojoule/Hour Converter

Power Converter

22 units available

Decimals:

From

To

3.6

1 J/s = 3.6 kJ/h

Formula:

kJ/h = J/s × 3.6

With your value: 1 J/s = 3.6 kJ/h

How big is that?

Everyday references on a logarithmic scale, all expressed in joule/second so you can sanity-check the result.

Your value1.00 J/s

LED bulb (9.0× your value)9.00 J/s

Laptop (65× your value)65.0 J/s

Microwave oven (1.0e+3× your value)1.00e+3 J/s

Electric kettle (3.0e+3× your value)3.00e+3 J/s

Family car engine (9.0e+4× your value)9.00e+4 J/s

Other Joule/Second to Kilojoule/Hour conversions

2 J/s to kJ/h 3 J/s to kJ/h 4 J/s to kJ/h 5 J/s to kJ/h 6 J/s to kJ/h 7 J/s to kJ/h 8 J/s to kJ/h

Joule/Second to Kilojoule/Hour Conversion Table

Joule/Second (J/s)	Kilojoule/Hour (kJ/h)
0.5	1.8
1	3.6
2	7.2
5	18
10	36
15	54
20	72
25	90
50	180
100	360
250	900
500	1,800
1000	3,600

Kilojoule/Hour to Joule/Second Conversion Table

Kilojoule/Hour (kJ/h)	Joule/Second (J/s)
0.5	0.138889
1	0.277778
2	0.555556
5	1.388889
10	2.777778
15	4.166667
20	5.555556
25	6.944444
50	13.888889
100	27.777778
250	69.444444
500	138.888889
1000	277.777778

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Joule/Second (J/s)

Power

Exact conversion

Derived from the watt (1 W = 1 J/s).

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Kilojoule/Hour (kJ/h)

Power

Exact conversion

Derived from the watt (1 W = 1 J/s).

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Joule/Second to Kilojoule/Hour

To convert from Joule/Second (J/s) to Kilojoule/Hour (kJ/h), multiply the value by 3.6.

Formula: kJ/h = J/s × 3.6

Reverse: J/s = kJ/h × 0.2777777778

Step-by-Step Example

Start with your value in Joule/Second. For example: 5 J/s
Multiply by the conversion factor: 5 x 3.6
The result is: 18 kJ/h

About Joule/Second

The joule/second (J/s) is a unit of power. One joule/second equals 1 watt. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: power calculations, engineering and science, education.

About Kilojoule/Hour

The kilojoule/hour (kJ/h) is a unit of power. One kilojoule/hour equals 0.2777777778 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: power calculations, engineering and science, education.

Frequently Asked Questions

How many Kilojoule/Hour are in 1 Joule/Second?

There are exactly 3.6 Kilojoule/Hour in 1 Joule/Second. This means the conversion factor from Joule/Second to Kilojoule/Hour is 3.6.

What is the formula to convert Joule/Second to Kilojoule/Hour?

The formula to convert Joule/Second to Kilojoule/Hour is: kJ/h = J/s × 3.6. For example, to convert 10 Joule/Second to Kilojoule/Hour, you would multiply 10 by 3.6.

What is a Joule/Second?