Gray is absorbed dose in joules per kilogram.
Gray to Gigagray
Convert Gray (Gy) to Gigagray (GGy) instantly. Free online radiation converter with formulas, tables and examples.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Converter
Radiation Converter
Convert radioactivity, absorbed dose, and equivalent dose units by compatible radiation family.
Context values
Some unit families need one extra value for a physically accurate result.
Gigagray is 1000000000 gray units.
GGy = Gy × 1e-9
Results update instantly for Gray to Gigagray conversions.
Reserved above the conversion cards and below the converter.
Formula
1 Gray = 1e-9 Gigagray
GGy = Gy × 1e-9
Gy = GGy ÷ 1e-9
Conversion table
| 1 Gy | 1e-9 GGy |
| 2 Gy | 2e-9 GGy |
| 5 Gy | 5e-9 GGy |
| 10 Gy | 1e-8 GGy |
| 20 Gy | 2e-8 GGy |
| 50 Gy | 5e-8 GGy |
| 100 Gy | 1e-7 GGy |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many Gigagrays are in one Gray?
One Gray equals 1e-9 Gigagrays.
How do I convert Gray to Gigagray?
Multiply the number of Grays by 1e-9 to get Gigagrays. To go the other way, multiply Gigagrays by 1e+9 (or divide by 1e-9) to get Grays.
Is this conversion exact?
Yes. This conversion uses the exact defined relationship between Gray and Gigagray, so the result shown is mathematically precise (rounded only for display).
When is Gray to Gigagray conversion commonly used?
It is commonly used in nuclear medicine, radiation safety, health physics, and scientific research involving radioactivity and radiation dose.
Reserved between the FAQ and the article so the page stays balanced.
About this conversion
Gray and Gigagray are units used in the radiation family of measurements. Both units measure absorbed radiation dose (energy deposited per unit mass). This converter uses the precise relationship 1 Gray = 1e-9 Gigagrays (equivalently 1 Gigagray = 1e+9 Grays), so results stay accurate for nuclear medicine, radiation safety, health physics, and scientific research.