Zettagray is 1e+21 gray units.
Zettagrays to Exagrays Converter — ZGy to EGy
Convert Zettagray (ZGy) to Exagray (EGy) using the exact conversion factor (1 zettagray = 1,000 exagray). See the formula, worked examples, and conversion table.
Zettagrays to Exagrays 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.
Exagray is 1000000000000000000 gray units.
Result = input x 1e+21 / 1e+18.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Zettagrays to Exagrays
Zettagray and Exagray 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: Zettagray is 1e+21 gray units, and exagray is 1000000000000000000 gray units.
Formula
exagrays = zettagrays × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 zettagray equals 1e+21 base units, and 1 exagray equals 1e+18 base units, so dividing one by the other gives the direct zettagray-to-exagray factor of 1000.
Simple example
1 ZGy × 1000 = 1,000 EGy
1 zettagray = 1,000 exagrays.
Real-world example
10 ZGy × 1000 = 10,000 EGy
10 zettagrays = 10,000 exagrays.
Conversion table
| Zettagray (ZGy) | Exagray (EGy) |
|---|---|
| 0.001 ZGy | 1 EGy |
| 0.01 ZGy | 10 EGy |
| 0.1 ZGy | 100 EGy |
| 1 ZGy | 1,000 EGy |
| 10 ZGy | 10,000 EGy |
| 100 ZGy | 100,000 EGy |
Reverse conversion: Exagray to Zettagray
1 EGy × 0.001 = 0.001 ZGy
1 exagray = 0.001 zettagrays.
zettagrays = exagrays × 0.001
For a page dedicated to this direction, see Exagray to Zettagray.
Understanding the Zettagray (ZGy)
Zettagray is 1e+21 gray units.
Understanding the Exagray (EGy)
Exagray is 1000000000000000000 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many exagrays are in 1 zettagray?
1 zettagray equals 1,000 exagrays, using the exact defined conversion factor rather than an estimate.
How do I convert zettagray to exagray?
Multiply the zettagray value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert exagray back to zettagray?
Use the reverse factor: 1 exagray equals 0.001 zettagrays. You can also use the swap control in the converter above to flip the direction instantly.
What is a zettagray?
Zettagray (ZGy) is a unit of radiation.
What is a exagray?
Exagray (EGy) is a unit of radiation.
Is the zettagray to exagray conversion exact?
Yes. Both zettagray and exagray are defined by fixed standards rather than physical artifacts, so the factor of 1000 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.