Gigawatt to Milliwatt Converter

Power Converter

22 units available

Decimals:

From

To

1.000000e+12

1 GW = 1.000000e+12 mW

Formula:

mW = GW × 1.000000e+12

With your value: 1 GW = 1.000000e+12 mW

How big is that?

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

LED bulb (1/1.1e+8 your value)9.00e-9 GW

Laptop (1/1.5e+7 your value)6.50e-8 GW

Microwave oven (1/1.0e+6 your value)0.00000100 GW

Electric kettle (1/3.3e+5 your value)0.00000300 GW

Family car engine (1/1.1e+4 your value)0.0000900 GW

Your value1.00 GW

Other Gigawatt to Milliwatt conversions

2 GW to mW 3 GW to mW 4 GW to mW 5 GW to mW 6 GW to mW 7 GW to mW 8 GW to mW

Gigawatt to Milliwatt Conversion Table

Gigawatt (GW)	Milliwatt (mW)
0.5	500,000,000,000
1	1.000000e+12
2	2.000000e+12
5	5.000000e+12
10	1.000000e+13
15	1.500000e+13
20	2.000000e+13
25	2.500000e+13
50	5.000000e+13
100	1.000000e+14
250	2.500000e+14
500	5.000000e+14
1000	1.000000e+15

Milliwatt to Gigawatt Conversion Table

Milliwatt (mW)	Gigawatt (GW)
0.5	5.000000e-13
1	1.000000e-12
2	2.000000e-12
5	5.000000e-12
10	1.000000e-11
15	1.500000e-11
20	2.000000e-11
25	2.500000e-11
50	5.000000e-11
100	1.000000e-10
250	2.500000e-10
500	5.000000e-10
1000	1.000000e-9

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.

Gigawatt (GW)

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 Gigawatt to Milliwatt

To convert from Gigawatt (GW) to Milliwatt (mW), multiply the value by 1.000000e+12.

Formula: mW = GW × 1.000000e+12

Reverse: GW = mW × 1.000000e-12

Step-by-Step Example

Start with your value in Gigawatt. For example: 5 GW
Multiply by the conversion factor: 5 x 1.000000e+12
The result is: 5.000000e+12 mW

About Gigawatt

The gigawatt (GW) is a unit of power. One gigawatt equals 1.000000 × 10^+9 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 Gigawatt?

There are exactly 1.000000e+12 Milliwatt in 1 Gigawatt. This means the conversion factor from Gigawatt to Milliwatt is 1.000000e+12.

What is the formula to convert Gigawatt to Milliwatt?

The formula to convert Gigawatt to Milliwatt is: mW = GW × 1.000000e+12. For example, to convert 10 Gigawatt to Milliwatt, you would multiply 10 by 1.000000e+12.

What is a Gigawatt?