Zeptogray is 1e-21 gray units.
Zeptograys to Attograys Converter — zGy to aGy
Convert Zeptogray (zGy) to Attogray (aGy) using the exact conversion factor (1 zeptogray = 0.001 attogray). See the formula, worked examples, and conversion table.
Zeptograys to Attograys 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.
Attogray is 1e-18 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 Zeptograys to Attograys
Zeptogray and Attogray 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: Zeptogray is 1e-21 gray units, and attogray is 1e-18 gray units.
Formula
attograys = zeptograys × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptogray equals 1e-21 base units, and 1 attogray equals 1e-18 base units, so dividing one by the other gives the direct zeptogray-to-attogray factor of 0.001.
Simple example
1 zGy × 0.001 = 0.001 aGy
1 zeptogray = 0.001 attograys.
Real-world example
10 zGy × 0.001 = 0.01 aGy
10 zeptograys = 0.01 attograys.
Conversion table
| Zeptogray (zGy) | Attogray (aGy) |
|---|---|
| 0.001 zGy | 0.000001 aGy |
| 0.01 zGy | 0.00001 aGy |
| 0.1 zGy | 0.0001 aGy |
| 1 zGy | 0.001 aGy |
| 10 zGy | 0.01 aGy |
| 100 zGy | 0.1 aGy |
Reverse conversion: Attogray to Zeptogray
0.001 aGy × 1000 = 1 zGy
0.001 attograys = 1 zeptograys.
zeptograys = attograys × 1000
For a page dedicated to this direction, see Attogray to Zeptogray.
Understanding the Zeptogray (zGy)
Zeptogray is 1e-21 gray units.
Understanding the Attogray (aGy)
Attogray is 1e-18 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attograys are in 1 zeptogray?
1 zeptogray equals 0.001 attograys, using the exact defined conversion factor rather than an estimate.
How do I convert zeptogray to attogray?
Multiply the zeptogray value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert attogray back to zeptogray?
Use the reverse factor: 1 attogray equals 1,000 zeptograys. You can also use the swap control in the converter above to flip the direction instantly.
What is a zeptogray?
Zeptogray (zGy) is a unit of radiation.
What is a attogray?
Attogray (aGy) is a unit of radiation.
Is the zeptogray to attogray conversion exact?
Yes. Both zeptogray and attogray 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.