Gigagray is 1000000000 gray units.
Gigagrays to Petagrays Converter — GGy to PGy
Convert Gigagray (GGy) to Petagray (PGy) using the exact conversion factor (1 gigagray = 0.000001 petagray). See the formula, worked examples, and conversion table.
Gigagrays to Petagrays converter
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.
Petagray is 1000000000000000 gray units.
Result = input x 1e+9 / 1e+15.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Gigagrays to Petagrays
Gigagray and Petagray both belong to the radiation-measurement family, though radiation quantities fall into genuinely distinct categories: absorbed dose (gray, rad) measures energy deposited in matter, equivalent dose (sievert, rem) weights that for biological harm, and activity (becquerel, curie) measures how often a radioactive source decays — this page only converts between units of the same kind. Specifically: Gigagray is 1000000000 gray units, and petagray is 1000000000000000 gray units.
Formula
petagrays = gigagrays × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 gigagray equals 1000000000 base units, and 1 petagray equals 1e+15 base units, so dividing one by the other gives the direct gigagray-to-petagray factor of 0.000001.
Simple example
1 GGy × 0.000001 = 0.000001 PGy
1 gigagray = 0.000001 petagrays.
Real-world example
10 GGy × 0.000001 = 0.00001 PGy
10 gigagrays = 0.00001 petagrays.
Conversion table
| Gigagray (GGy) | Petagray (PGy) |
|---|---|
| 0.001 GGy | 1e-9 PGy |
| 0.01 GGy | 1e-8 PGy |
| 0.1 GGy | 1e-7 PGy |
| 1 GGy | 0.000001 PGy |
| 10 GGy | 0.00001 PGy |
| 100 GGy | 0.0001 PGy |
Reverse conversion: Petagray to Gigagray
0.000001 PGy × 1000000 = 1 GGy
0.000001 petagrays = 1 gigagray.
gigagrays = petagrays × 1000000
For a page dedicated to this direction, see Petagray to Gigagray.
Understanding the Gigagray (GGy)
Gigagray is 1000000000 gray units.
Understanding the Petagray (PGy)
Petagray is 1000000000000000 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many petagrays are in 1 gigagray?
1 gigagray equals 0.000001 petagrays, using the exact defined conversion factor rather than an estimate.
How do I convert gigagray to petagray?
Multiply the gigagray value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert petagray back to gigagray?
Use the reverse factor: 1 petagray equals 1,000,000 gigagrays. You can also use the swap control in the converter above to flip the direction instantly.
What is a gigagray?
Gigagray (GGy) is a unit of radiation.
What is a petagray?
Petagray (PGy) is a unit of radiation.
Is the gigagray to petagray conversion exact?
Yes. Both gigagray and petagray are defined by fixed standards rather than physical artifacts, so the factor of 0.000001 used above is exact to as many digits as you choose to display.
What's the difference between absorbed dose, equivalent dose, and activity?
Absorbed dose (gray, rad) measures the energy radiation deposits in matter. Equivalent dose (sievert, rem) adjusts that figure for how harmful different types of radiation are to biological tissue. Activity (becquerel, curie) measures how often a radioactive source decays, independent of how much dose a person actually receives from it.