Teragray is 1000000000000 gray units.
Teragrays to Quettagrays Converter — TGy to QGy
Convert Teragray (TGy) to Quettagray (QGy) using the exact conversion factor (1 teragray = 1e-18 quettagray). See the formula, worked examples, and conversion table.
Teragrays to Quettagrays 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.
Quettagray is 1e+30 gray units.
Result = input x 1e+12 / 1e+30.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Teragrays to Quettagrays
Teragray and Quettagray 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 quettagray is 1e+30 gray units.
Formula
quettagrays = teragrays × 1e-18
This factor comes from each unit's defined relationship to the category's base unit: 1 teragray equals 1e+12 base units, and 1 quettagray equals 1e+30 base units, so dividing one by the other gives the direct teragray-to-quettagray factor of 1e-18.
Simple example
1 TGy × 1e-18 = 1e-18 QGy
1 teragray = 1e-18 quettagrays.
Real-world example
10 TGy × 1e-18 = 1e-17 QGy
10 teragrays = 1e-17 quettagrays.
Conversion table
| Teragray (TGy) | Quettagray (QGy) |
|---|---|
| 0.001 TGy | 1e-21 QGy |
| 0.01 TGy | 1e-20 QGy |
| 0.1 TGy | 1e-19 QGy |
| 1 TGy | 1e-18 QGy |
| 10 TGy | 1e-17 QGy |
| 100 TGy | 1e-16 QGy |
Reverse conversion: Quettagray to Teragray
1e-18 QGy × 1e+18 = 1 TGy
1e-18 quettagrays = 1 teragrays.
teragrays = quettagrays × 1e+18
For a page dedicated to this direction, see Quettagray to Teragray.
Understanding the Teragray (TGy)
Teragray is 1000000000000 gray units.
Understanding the Quettagray (QGy)
Quettagray is 1e+30 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many quettagrays are in 1 teragray?
1 teragray equals 1e-18 quettagrays, using the exact defined conversion factor rather than an estimate.
How do I convert teragray to quettagray?
Multiply the teragray value by 1e-18. The converter above does this instantly to whatever precision you set.
How do I convert quettagray back to teragray?
Use the reverse factor: 1 quettagray equals 1e+18 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 quettagray?
Quettagray (QGy) is a unit of radiation.
Is the teragray to quettagray conversion exact?
Yes. Both teragray and quettagray are defined by fixed standards rather than physical artifacts, so the factor of 1e-18 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.