Petagray is 1000000000000000 gray units.
Petagrays to Exagrays Converter — PGy to EGy
Convert Petagray (PGy) to Exagray (EGy) using the exact conversion factor (1 petagray = 0.001 exagray). See the formula, worked examples, and conversion table.
Petagrays to Exagrays 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.
Exagray is 1000000000000000000 gray units.
Result = input x 1e+15 / 1e+18.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Petagrays to Exagrays
Petagray and Exagray 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 exagray is 1000000000000000000 gray units.
Formula
exagrays = petagrays × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 petagray equals 1e+15 base units, and 1 exagray equals 1e+18 base units, so dividing one by the other gives the direct petagray-to-exagray factor of 0.001.
Simple example
1 PGy × 0.001 = 0.001 EGy
1 petagray = 0.001 exagrays.
Real-world example
10 PGy × 0.001 = 0.01 EGy
10 petagrays = 0.01 exagrays.
Conversion table
| Petagray (PGy) | Exagray (EGy) |
|---|---|
| 0.001 PGy | 0.000001 EGy |
| 0.01 PGy | 0.00001 EGy |
| 0.1 PGy | 0.0001 EGy |
| 1 PGy | 0.001 EGy |
| 10 PGy | 0.01 EGy |
| 100 PGy | 0.1 EGy |
Reverse conversion: Exagray to Petagray
0.001 EGy × 1000 = 1 PGy
0.001 exagrays = 1 petagray.
petagrays = exagrays × 1000
For a page dedicated to this direction, see Exagray to Petagray.
Understanding the Petagray (PGy)
Petagray is 1000000000000000 gray units.
Understanding the Exagray (EGy)
Exagray is 1000000000000000000 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many exagrays are in 1 petagray?
1 petagray equals 0.001 exagrays, using the exact defined conversion factor rather than an estimate.
How do I convert petagray to exagray?
Multiply the petagray value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert exagray back to petagray?
Use the reverse factor: 1 exagray equals 1,000 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 exagray?
Exagray (EGy) is a unit of radiation.
Is the petagray to exagray conversion exact?
Yes. Both petagray and exagray are defined by fixed standards rather than physical artifacts, so the factor of 0.001 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.