Gigagray is 1000000000 gray units.
Gigagrays to Teragrays Converter — GGy to TGy
Convert Gigagray (GGy) to Teragray (TGy) using the exact conversion factor (1 gigagray = 0.001 teragray). See the formula, worked examples, and conversion table.
Gigagrays to Teragrays 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.
Teragray is 1000000000000 gray units.
Result = input x 1e+9 / 1e+12.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Gigagrays to Teragrays
Gigagray and Teragray 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: Gigagray is 1000000000 gray units, and teragray is 1000000000000 gray units.
Formula
teragrays = gigagrays × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 gigagray equals 1000000000 base units, and 1 teragray equals 1e+12 base units, so dividing one by the other gives the direct gigagray-to-teragray factor of 0.001.
Simple example
1 GGy × 0.001 = 0.001 TGy
1 gigagray = 0.001 teragrays.
Real-world example
10 GGy × 0.001 = 0.01 TGy
10 gigagrays = 0.01 teragrays.
Conversion table
| Gigagray (GGy) | Teragray (TGy) |
|---|---|
| 0.001 GGy | 0.000001 TGy |
| 0.01 GGy | 0.00001 TGy |
| 0.1 GGy | 0.0001 TGy |
| 1 GGy | 0.001 TGy |
| 10 GGy | 0.01 TGy |
| 100 GGy | 0.1 TGy |
Reverse conversion: Teragray to Gigagray
0.001 TGy × 1000 = 1 GGy
0.001 teragrays = 1 gigagray.
gigagrays = teragrays × 1000
For a page dedicated to this direction, see Teragray to Gigagray.
Understanding the Gigagray (GGy)
Gigagray is 1000000000 gray units.
Understanding the Teragray (TGy)
Teragray is 1000000000000 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many teragrays are in 1 gigagray?
1 gigagray equals 0.001 teragrays, using the exact defined conversion factor rather than an estimate.
How do I convert gigagray to teragray?
Multiply the gigagray value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert teragray back to gigagray?
Use the reverse factor: 1 teragray equals 1,000 gigagrays. You can also use the swap control in the converter above to flip the direction instantly.
What is a gigagray?
Gigagray (GGy) is a unit of radiation.
What is a teragray?
Teragray (TGy) is a unit of radiation.
Is the gigagray to teragray conversion exact?
Yes. Both gigagray and teragray 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.