Kilojoule/Hour to Milliwatt Converter

Power Converter

22 units available

Decimals:

From

To

277.777778

1 kJ/h = 277.777778 mW

Formula:

mW = kJ/h × 277.7777777778

With your value: 1 kJ/h = 277.77777778 mW

How big is that?

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

Your value1.00 kJ/h

LED bulb (32× your value)32.4 kJ/h

Laptop (2.3e+2× your value)234 kJ/h

Microwave oven (3.6e+3× your value)3.60e+3 kJ/h

Electric kettle (1.1e+4× your value)1.08e+4 kJ/h

Family car engine (3.2e+5× your value)3.24e+5 kJ/h

Other Kilojoule/Hour to Milliwatt conversions

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

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

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

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.

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

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

How to Convert Kilojoule/Hour to Milliwatt

To convert from Kilojoule/Hour (kJ/h) to Milliwatt (mW), multiply the value by 277.7777777778.

Formula: mW = kJ/h × 277.7777777778

Reverse: kJ/h = mW × 0.0036

Step-by-Step Example

Start with your value in Kilojoule/Hour. For example: 5 kJ/h
Multiply by the conversion factor: 5 x 277.7777777778
The result is: 1,388.888889 mW

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.

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.

Frequently Asked Questions

How many Milliwatt are in 1 Kilojoule/Hour?

There are exactly 277.7777777778 Milliwatt in 1 Kilojoule/Hour. This means the conversion factor from Kilojoule/Hour to Milliwatt is 277.7777777778.

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

The formula to convert Kilojoule/Hour to Milliwatt is: mW = kJ/h × 277.7777777778. For example, to convert 10 Kilojoule/Hour to Milliwatt, you would multiply 10 by 277.7777777778.

What is a Kilojoule/Hour?