Exagray is 1000000000000000000 gray units.
Exagrays to Zettagrays Converter — EGy to ZGy
Convert Exagray (EGy) to Zettagray (ZGy) using the exact conversion factor (1 exagray = 0.001 zettagray). See the formula, worked examples, and conversion table.
Exagrays to Zettagrays 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.
Zettagray is 1e+21 gray units.
Result = input x 1e+18 / 1e+21.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Exagrays to Zettagrays
Exagray and Zettagray 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: Exagray is 1000000000000000000 gray units, and zettagray is 1e+21 gray units.
Formula
zettagrays = exagrays × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 exagray equals 1e+18 base units, and 1 zettagray equals 1e+21 base units, so dividing one by the other gives the direct exagray-to-zettagray factor of 0.001.
Simple example
1 EGy × 0.001 = 0.001 ZGy
1 exagray = 0.001 zettagrays.
Real-world example
10 EGy × 0.001 = 0.01 ZGy
10 exagrays = 0.01 zettagrays.
Conversion table
| Exagray (EGy) | Zettagray (ZGy) |
|---|---|
| 0.001 EGy | 0.000001 ZGy |
| 0.01 EGy | 0.00001 ZGy |
| 0.1 EGy | 0.0001 ZGy |
| 1 EGy | 0.001 ZGy |
| 10 EGy | 0.01 ZGy |
| 100 EGy | 0.1 ZGy |
Reverse conversion: Zettagray to Exagray
0.001 ZGy × 1000 = 1 EGy
0.001 zettagrays = 1 exagray.
exagrays = zettagrays × 1000
For a page dedicated to this direction, see Zettagray to Exagray.
Understanding the Exagray (EGy)
Exagray is 1000000000000000000 gray units.
Understanding the Zettagray (ZGy)
Zettagray is 1e+21 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zettagrays are in 1 exagray?
1 exagray equals 0.001 zettagrays, using the exact defined conversion factor rather than an estimate.
How do I convert exagray to zettagray?
Multiply the exagray value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert zettagray back to exagray?
Use the reverse factor: 1 zettagray equals 1,000 exagrays. You can also use the swap control in the converter above to flip the direction instantly.
What is a exagray?
Exagray (EGy) is a unit of radiation.
What is a zettagray?
Zettagray (ZGy) is a unit of radiation.
Is the exagray to zettagray conversion exact?
Yes. Both exagray and zettagray 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.