Petagray is 1000000000000000 gray units.
Petagrays to Gigagrays Converter — PGy to GGy
Convert Petagray (PGy) to Gigagray (GGy) using the exact conversion factor (1 petagray = 1,000,000 gigagray). See the formula, worked examples, and conversion table.
Petagrays to Gigagrays 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.
Gigagray is 1000000000 gray units.
Result = input x 1e+15 / 1e+9.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Petagrays to Gigagrays
Petagray and Gigagray 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: Petagray is 1000000000000000 gray units, and gigagray is 1000000000 gray units.
Formula
gigagrays = petagrays × 1000000
This factor comes from each unit's defined relationship to the category's base unit: 1 petagray equals 1e+15 base units, and 1 gigagray equals 1000000000 base units, so dividing one by the other gives the direct petagray-to-gigagray factor of 1000000.
Simple example
1 PGy × 1000000 = 1,000,000 GGy
1 petagray = 1,000,000 gigagrays.
Real-world example
10 PGy × 1000000 = 10,000,000 GGy
10 petagrays = 10,000,000 gigagrays.
Conversion table
| Petagray (PGy) | Gigagray (GGy) |
|---|---|
| 0.001 PGy | 1,000 GGy |
| 0.01 PGy | 10,000 GGy |
| 0.1 PGy | 100,000 GGy |
| 1 PGy | 1,000,000 GGy |
| 10 PGy | 10,000,000 GGy |
| 100 PGy | 100,000,000 GGy |
Reverse conversion: Gigagray to Petagray
1 GGy × 0.000001 = 0.000001 PGy
1 gigagray = 0.000001 petagrays.
petagrays = gigagrays × 0.000001
For a page dedicated to this direction, see Gigagray to Petagray.
Understanding the Petagray (PGy)
Petagray is 1000000000000000 gray units.
Understanding the Gigagray (GGy)
Gigagray is 1000000000 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many gigagrays are in 1 petagray?
1 petagray equals 1,000,000 gigagrays, using the exact defined conversion factor rather than an estimate.
How do I convert petagray to gigagray?
Multiply the petagray value by 1000000. The converter above does this instantly to whatever precision you set.
How do I convert gigagray back to petagray?
Use the reverse factor: 1 gigagray equals 0.000001 petagrays. You can also use the swap control in the converter above to flip the direction instantly.
What is a petagray?
Petagray (PGy) is a unit of radiation.
What is a gigagray?
Gigagray (GGy) is a unit of radiation.
Is the petagray to gigagray conversion exact?
Yes. Both petagray and gigagray are defined by fixed standards rather than physical artifacts, so the factor of 1000000 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.