Milliwatt to Kilojoule/Hour Converter

Power Converter

22 units available

Decimals:

From

To

0.0036

1 mW = 0.0036 kJ/h

Formula:

kJ/h = mW × 0.0036

With your value: 1 mW = 0.0036 kJ/h

How big is that?

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

Your value1.00 mW

LED bulb (9.0e+3× your value)9.00e+3 mW

Laptop (6.5e+4× your value)6.50e+4 mW

Microwave oven (1.0e+6× your value)1.00e+6 mW

Electric kettle (3.0e+6× your value)3.00e+6 mW

Family car engine (9.0e+7× your value)9.00e+7 mW

Other Milliwatt to Kilojoule/Hour conversions

2 mW to kJ/h 3 mW to kJ/h 4 mW to kJ/h 5 mW to kJ/h 6 mW to kJ/h 7 mW to kJ/h 8 mW to kJ/h

Milliwatt to Kilojoule/Hour Conversion Table

Milliwatt (mW)	Kilojoule/Hour (kJ/h)
0.5	0.0018
1	0.0036
2	0.0072
5	0.018
10	0.036
15	0.054
20	0.072
25	0.09
50	0.18
100	0.36
250	0.9
500	1.8
1000	3.6

Kilojoule/Hour to Milliwatt Conversion Table

Kilojoule/Hour (kJ/h)	Milliwatt (mW)
0.5	138.888889
1	277.777778
2	555.555556
5	1,388.888889
10	2,777.777778
15	4,166.666667
20	5,555.555556
25	6,944.444444
50	13,888.888889
100	27,777.777778
250	69,444.444444
500	138,888.888889
1000	277,777.777778

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.

Milliwatt (mW)

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 Milliwatt to Kilojoule/Hour

To convert from Milliwatt (mW) to Kilojoule/Hour (kJ/h), multiply the value by 0.0036.

Formula: kJ/h = mW × 0.0036

Reverse: mW = kJ/h × 277.7777777778

Step-by-Step Example

Start with your value in Milliwatt. For example: 5 mW
Multiply by the conversion factor: 5 x 0.0036
The result is: 0.018 kJ/h

About Milliwatt

The milliwatt (mW) is a unit of power. One milliwatt equals 0.001 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.

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 Milliwatt?

There are exactly 0.0036 Kilojoule/Hour in 1 Milliwatt. This means the conversion factor from Milliwatt to Kilojoule/Hour is 0.0036.

What is the formula to convert Milliwatt to Kilojoule/Hour?

The formula to convert Milliwatt to Kilojoule/Hour is: kJ/h = mW × 0.0036. For example, to convert 10 Milliwatt to Kilojoule/Hour, you would multiply 10 by 0.0036.

What is a Milliwatt?