Convert Watts (W) to Gigawatts (GW)

1 watt equals 1 × 10⁻⁹ gigawatts.

Formula: GW = W × 1 × 10⁻⁹

Watt to Gigawatt Converter

How to Convert Watt to Gigawatt

1 watt = 1 × 10^-9 gigawatts

Gigawatt = Watt × 1 × 10^-9

Example: 1 W × 1 × 10^-9 = 1 × 10^-9 GW

Reverse Conversion

To convert gigawatts back to watts:

Remember, 1 gigawatt equals 1 × 10⁹ watts.
To convert 1 × 10^-9 GW to W, multiply 1 × 10^-9 x 1 × 10⁹, resulting in 1 W.

Common Watt to Gigawatt Conversions

Watt to Gigawatt (Part 1)

Watt	Gigawatt	Actions
1 watt	1 × 10^-9 gigawatts
5 watts	5 × 10^-9 gigawatts
10 watts	1 × 10^-8 gigawatts
25 watts	2.5 × 10^-8 gigawatts

Watt to Gigawatt (Part 2)

Watt	Gigawatt	Actions
50 watts	5 × 10^-8 gigawatts
100 watts	1 × 10^-7 gigawatts
500 watts	5 × 10^-7 gigawatts
1000 watts	1 × 10^-6 gigawatts

Watts to gigawatts Conversion Table

Reference table with common watts to gigawatts conversions. All values calculated with high precision.

Watts to Gigawatts Table
10000 to 5 × 10⁷

Watts	Gigawatts	Actions
10000 W	1 × 10^-5 GW
25000 W	2.5 × 10^-5 GW
50000 W	5 × 10^-5 GW
100000 W	0.0001 GW
250000 W	0.00025 GW
500000 W	0.0005 GW
1000000 W	0.001 GW
2500000 W	0.0025 GW
5000000 W	0.005 GW
10000000 W	0.01 GW
2.5 × 10⁷ W	0.025 GW
5 × 10⁷ W	0.05 GW

Watts to Gigawatts Table
1 × 10⁸ to 1 × 10¹³

Watts	Gigawatts	Actions
1 × 10⁸ W	0.1 GW
2.5 × 10⁸ W	14 GW
5 × 10⁸ W	12 GW
1 × 10⁹ W	1 GW
2.5 × 10⁹ W	2 12 GW
5 × 10⁹ W	5 GW
1 × 10¹⁰ W	10 GW
2.5 × 10¹⁰ W	25 GW
5 × 10¹⁰ W	50 GW
1 × 10¹¹ W	100 GW
2.5 × 10¹¹ W	250 GW
5 × 10¹¹ W	500 GW
1 × 10¹² W	1000 GW
2.5 × 10¹² W	2500 GW
5 × 10¹² W	5000 GW
1 × 10¹³ W	10000 GW

Gigawatts to Watts Table
0.0001 to 12

Gigawatts	Watts	Actions
0.0001 GW	100000 W
0.00025 GW	250000 W
0.0005 GW	500000 W
0.001 GW	1000000 W
0.0025 GW	2500000 W
0.005 GW	5000000 W
0.01 GW	10000000 W
0.025 GW	2.5 × 10⁷ W
0.05 GW	5 × 10⁷ W
0.1 GW	1 × 10⁸ W
14 GW	2.5 × 10⁸ W
12 GW	5 × 10⁸ W

Gigawatts to Watts Table
1 to 100000

Gigawatts	Watts	Actions
1 GW	1 × 10⁹ W
2 12 GW	2.5 × 10⁹ W
5 GW	5 × 10⁹ W
10 GW	1 × 10¹⁰ W
25 GW	2.5 × 10¹⁰ W
50 GW	5 × 10¹⁰ W
100 GW	1 × 10¹¹ W
250 GW	2.5 × 10¹¹ W
500 GW	5 × 10¹¹ W
1000 GW	1 × 10¹² W
2500 GW	2.5 × 10¹² W
5000 GW	5 × 10¹² W
10000 GW	1 × 10¹³ W
25000 GW	2.5 × 10¹³ W
50000 GW	5 × 10¹³ W
100000 GW	1 × 10¹⁴ W

Definition of Watt

Definition: SI base unit of power equal to one joule per second.
Exact relation: 1 W = 1 J/s = 1 kg·m²·s⁻³
Sources: BIPM — SI Brochure

Definition of Gigawatt

Definition: SI multiple of the watt equal to one billion watts.
Exact factor: 1 GW = 10⁹ W
Sources: BIPM — SI Brochure

About the Watt

Facts & Uses

Named after James Watt, inventor of the improved steam engine.
Core SI unit for power — rate of energy transfer per second.
Used universally in physics, electronics, and engineering.

Curiosities

A human at rest emits about 100 W of heat.
Modern LED lamps use 5–15 W with similar brightness to 60–100 W incandescent bulbs.

Frequently Asked Questions

How many gigawatts are in one watt?

One watt equals 1 × 10^-9 gigawatts. To convert, multiply the watt value by 1 × 10^-9. For the reverse, divide the gigawatt value by 1 × 10^-9 (or multiply by 1 × 10⁹).

What is 2.5 × 10<sup>8</sup> watts in gigawatts?

2.5 × 10⁸ watts = 14 gigawatts. This is one of the most commonly searched conversions for this pair.

How precise is the watt-to-gigawatt conversion?

The factor 1 × 10^-9 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.

Looking for the reverse? Convert Gigawatt to Watt

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Conversion factors verified against NIST, BIPM, ISO 80000-4 Based on SI base units (W = J/s, BIPM). Last reviewed: April 2026

By Adilson Fernandes

Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.