Watts to Gigawatts Converter

To convert watts to gigawatts, multiply by 1e-9.

LET’S WORK IT OUT

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To convert watts to gigawatts, multiply by 1e-9.

The calculation uses 1 W = 1e-9 GW. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.

The formula

value in GW = value in W × 1e-9
W
Input unit: watts
GW
Output unit: gigawatts

How to use this calculator

  1. Enter a value in W.
  2. Multiply by the stored conversion factor.
  3. Read the result in GW; divide by the same factor to convert back.

Worked examples

Worked conversion

1 W × 1e-9 ≈ 1e-9 GW.

Reverse conversion

1e-9 GW ÷ 1e-9 ≈ 1 W. Rounding intermediate values can change the last displayed digit.

Frequently asked questions

What factor does this converter use?

It uses 1e-9 GW per W.

Why can another converter show a slightly different answer?

Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.

W to GW table

WGW (rounded)
00
11e-9
22e-9
55e-9
101e-8
1001e-7

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