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
W- Input unit: watts
GW- Output unit: gigawatts
How to use this calculator
- Enter a value in W.
- Multiply by the stored conversion factor.
- 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
| W | GW (rounded) |
|---|---|
| 0 | 0 |
| 1 | 1e-9 |
| 2 | 2e-9 |
| 5 | 5e-9 |
| 10 | 1e-8 |
| 100 | 1e-7 |