Kilowatt-Hour to Millijoule Converter

Energy Converter

27 units available

Decimals:

From

To

3,600,000,000

1 kWh = 3,600,000,000 mJ

Formula:

mJ = kWh × 3.600000e+9

With your value: 1 kWh = 3,600,000,000 mJ

How big is that?

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

Heartbeat (1/3.6e+6 your value)2.78e-7 kWh

AA battery charge (1/3.6e+2 your value)0.00278 kWh

Slice of bread (1/13 your value)0.0778 kWh

Your value1.00 kWh

Daily food intake (2.3× your value)2.33 kWh

Litre of petrol (9.5× your value)9.50 kWh

Other Kilowatt-Hour to Millijoule conversions

2 kWh to mJ 3 kWh to mJ 4 kWh to mJ 5 kWh to mJ 6 kWh to mJ 7 kWh to mJ 8 kWh to mJ

Kilowatt-Hour to Millijoule Conversion Table

Kilowatt-Hour (kWh)	Millijoule (mJ)
0.5	1,800,000,000
1	3,600,000,000
2	7,200,000,000
5	18,000,000,000
10	36,000,000,000
15	54,000,000,000
20	72,000,000,000
25	90,000,000,000
50	180,000,000,000
100	360,000,000,000
250	900,000,000,000
500	1.800000e+12
1000	3.600000e+12

Millijoule to Kilowatt-Hour Conversion Table

Millijoule (mJ)	Kilowatt-Hour (kWh)
0.5	1.388889e-10
1	2.777778e-10
2	5.555556e-10
5	1.388889e-9
10	2.777778e-9
15	4.166667e-9
20	5.555556e-9
25	6.944444e-9
50	1.388889e-8
100	2.777778e-8
250	6.944444e-8
500	1.388889e-7
1000	2.777778e-7

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.

Kilowatt-Hour (kWh)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

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

Millijoule (mJ)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

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 Kilowatt-Hour to Millijoule

To convert from Kilowatt-Hour (kWh) to Millijoule (mJ), multiply the value by 3,600,000,000.

Formula: mJ = kWh × 3.600000e+9

Reverse: kWh = mJ × 2.777778e-10

Step-by-Step Example

Start with your value in Kilowatt-Hour. For example: 5 kWh
Multiply by the conversion factor: 5 x 3,600,000,000
The result is: 18,000,000,000 mJ

About Kilowatt-Hour

The kilowatt-hour is a unit of energy equal to 3.6 million joules, commonly used for electrical billing.

Common uses: electricity bills, energy consumption, appliances.

About Millijoule

The millijoule (mJ) is a unit of energy and work. One millijoule equals 0.001 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

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

Frequently Asked Questions

How many Millijoule are in 1 Kilowatt-Hour?

There are exactly 3,600,000,000 Millijoule in 1 Kilowatt-Hour. This means the conversion factor from Kilowatt-Hour to Millijoule is 3,600,000,000.

What is the formula to convert Kilowatt-Hour to Millijoule?

The formula to convert Kilowatt-Hour to Millijoule is: mJ = kWh × 3.600000e+9. For example, to convert 10 Kilowatt-Hour to Millijoule, you would multiply 10 by 3,600,000,000.

What is a Kilowatt-Hour?