Centigray is 0.01 gray units.
Centigrays to Petagrays Converter — cGy to PGy
Convert Centigray (cGy) to Petagray (PGy) using the exact conversion factor (1 centigray = 1e-17 petagray). See the formula, worked examples, and conversion table.
Centigrays 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 0.01 / 1e+15.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Centigrays to Petagrays
Centigray 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: Centigray is 0.01 gray units, and petagray is 1000000000000000 gray units.
Formula
petagrays = centigrays × 1e-17
This factor comes from each unit's defined relationship to the category's base unit: 1 centigray equals 0.01 base units, and 1 petagray equals 1e+15 base units, so dividing one by the other gives the direct centigray-to-petagray factor of 1e-17.
Simple example
1 cGy × 1e-17 = 1e-17 PGy
1 centigray = 1e-17 petagrays.
Real-world example
10 cGy × 1e-17 = 1e-16 PGy
10 centigrays = 1e-16 petagrays.
Conversion table
| Centigray (cGy) | Petagray (PGy) |
|---|---|
| 0.001 cGy | 1e-20 PGy |
| 0.01 cGy | 1e-19 PGy |
| 0.1 cGy | 1e-18 PGy |
| 1 cGy | 1e-17 PGy |
| 10 cGy | 1e-16 PGy |
| 100 cGy | 1e-15 PGy |
Reverse conversion: Petagray to Centigray
1e-17 PGy × 1e+17 = 1 cGy
1e-17 petagrays = 1 centigray.
centigrays = petagrays × 1e+17
For a page dedicated to this direction, see Petagray to Centigray.
Understanding the Centigray (cGy)
Centigray is 0.01 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 centigray?
1 centigray equals 1e-17 petagrays, using the exact defined conversion factor rather than an estimate.
How do I convert centigray to petagray?
Multiply the centigray value by 1e-17. The converter above does this instantly to whatever precision you set.
How do I convert petagray back to centigray?
Use the reverse factor: 1 petagray equals 1e+17 centigrays. You can also use the swap control in the converter above to flip the direction instantly.
What is a centigray?
Centigray (cGy) is a unit of radiation.
What is a petagray?
Petagray (PGy) is a unit of radiation.
Is the centigray to petagray conversion exact?
Yes. Both centigray and petagray are defined by fixed standards rather than physical artifacts, so the factor of 1e-17 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.