Teragray is 1000000000000 gray units.
Teragrays to Petagrays Converter — TGy to PGy
Convert Teragray (TGy) to Petagray (PGy) using the exact conversion factor (1 teragray = 0.001 petagray). See the formula, worked examples, and conversion table.
Teragrays 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+12 / 1e+15.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Teragrays to Petagrays
Teragray 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: Teragray is 1000000000000 gray units, and petagray is 1000000000000000 gray units.
Formula
petagrays = teragrays × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 teragray equals 1e+12 base units, and 1 petagray equals 1e+15 base units, so dividing one by the other gives the direct teragray-to-petagray factor of 0.001.
Simple example
1 TGy × 0.001 = 0.001 PGy
1 teragray = 0.001 petagrays.
Real-world example
10 TGy × 0.001 = 0.01 PGy
10 teragrays = 0.01 petagrays.
Conversion table
| Teragray (TGy) | Petagray (PGy) |
|---|---|
| 0.001 TGy | 0.000001 PGy |
| 0.01 TGy | 0.00001 PGy |
| 0.1 TGy | 0.0001 PGy |
| 1 TGy | 0.001 PGy |
| 10 TGy | 0.01 PGy |
| 100 TGy | 0.1 PGy |
Reverse conversion: Petagray to Teragray
0.001 PGy × 1000 = 1 TGy
0.001 petagrays = 1 teragray.
teragrays = petagrays × 1000
For a page dedicated to this direction, see Petagray to Teragray.
Understanding the Teragray (TGy)
Teragray is 1000000000000 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 teragray?
1 teragray equals 0.001 petagrays, using the exact defined conversion factor rather than an estimate.
How do I convert teragray to petagray?
Multiply the teragray value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert petagray back to teragray?
Use the reverse factor: 1 petagray equals 1,000 teragrays. You can also use the swap control in the converter above to flip the direction instantly.
What is a teragray?
Teragray (TGy) is a unit of radiation.
What is a petagray?
Petagray (PGy) is a unit of radiation.
Is the teragray to petagray conversion exact?
Yes. Both teragray and petagray 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.