Petagray is 1000000000000000 gray units.
Petagrays to Zettagrays Converter — PGy to ZGy
Convert Petagray (PGy) to Zettagray (ZGy) using the exact conversion factor (1 petagray = 0.000001 zettagray). See the formula, worked examples, and conversion table.
Petagrays to Zettagrays 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.
Zettagray is 1e+21 gray units.
Result = input x 1e+15 / 1e+21.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Petagrays to Zettagrays
Petagray and Zettagray 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 zettagray is 1e+21 gray units.
Formula
zettagrays = petagrays × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 petagray equals 1e+15 base units, and 1 zettagray equals 1e+21 base units, so dividing one by the other gives the direct petagray-to-zettagray factor of 0.000001.
Simple example
1 PGy × 0.000001 = 0.000001 ZGy
1 petagray = 0.000001 zettagrays.
Real-world example
10 PGy × 0.000001 = 0.00001 ZGy
10 petagrays = 0.00001 zettagrays.
Conversion table
| Petagray (PGy) | Zettagray (ZGy) |
|---|---|
| 0.001 PGy | 1e-9 ZGy |
| 0.01 PGy | 1e-8 ZGy |
| 0.1 PGy | 1e-7 ZGy |
| 1 PGy | 0.000001 ZGy |
| 10 PGy | 0.00001 ZGy |
| 100 PGy | 0.0001 ZGy |
Reverse conversion: Zettagray to Petagray
0.000001 ZGy × 1000000 = 1 PGy
0.000001 zettagrays = 1 petagray.
petagrays = zettagrays × 1000000
For a page dedicated to this direction, see Zettagray to Petagray.
Understanding the Petagray (PGy)
Petagray is 1000000000000000 gray units.
Understanding the Zettagray (ZGy)
Zettagray is 1e+21 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zettagrays are in 1 petagray?
1 petagray equals 0.000001 zettagrays, using the exact defined conversion factor rather than an estimate.
How do I convert petagray to zettagray?
Multiply the petagray value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert zettagray back to petagray?
Use the reverse factor: 1 zettagray equals 1,000,000 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 zettagray?
Zettagray (ZGy) is a unit of radiation.
Is the petagray to zettagray conversion exact?
Yes. Both petagray and zettagray 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.