Yoctogray is 1e-24 gray units.
Yoctograys to Zeptograys Converter — yGy to zGy
Convert Yoctogray (yGy) to Zeptogray (zGy) using the exact conversion factor (1 yoctogray = 0.001 zeptogray). See the formula, worked examples, and conversion table.
Yoctograys to Zeptograys 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.
Zeptogray is 1e-21 gray units.
Result = input x 1e-24 / 1e-21.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Yoctograys to Zeptograys
Yoctogray and Zeptogray 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: Yoctogray is 1e-24 gray units, and zeptogray is 1e-21 gray units.
Formula
zeptograys = yoctograys × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 yoctogray equals 1e-24 base units, and 1 zeptogray equals 1e-21 base units, so dividing one by the other gives the direct yoctogray-to-zeptogray factor of 0.001.
Simple example
1 yGy × 0.001 = 0.001 zGy
1 yoctogray = 0.001 zeptograys.
Real-world example
10 yGy × 0.001 = 0.01 zGy
10 yoctograys = 0.01 zeptograys.
Conversion table
| Yoctogray (yGy) | Zeptogray (zGy) |
|---|---|
| 0.001 yGy | 0.000001 zGy |
| 0.01 yGy | 0.00001 zGy |
| 0.1 yGy | 0.0001 zGy |
| 1 yGy | 0.001 zGy |
| 10 yGy | 0.01 zGy |
| 100 yGy | 0.1 zGy |
Reverse conversion: Zeptogray to Yoctogray
0.001 zGy × 1000 = 1 yGy
0.001 zeptograys = 1 yoctogray.
yoctograys = zeptograys × 1000
For a page dedicated to this direction, see Zeptogray to Yoctogray.
Understanding the Yoctogray (yGy)
Yoctogray is 1e-24 gray units.
Understanding the Zeptogray (zGy)
Zeptogray is 1e-21 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zeptograys are in 1 yoctogray?
1 yoctogray equals 0.001 zeptograys, using the exact defined conversion factor rather than an estimate.
How do I convert yoctogray to zeptogray?
Multiply the yoctogray value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert zeptogray back to yoctogray?
Use the reverse factor: 1 zeptogray equals 1,000 yoctograys. You can also use the swap control in the converter above to flip the direction instantly.
What is a yoctogray?
Yoctogray (yGy) is a unit of radiation.
What is a zeptogray?
Zeptogray (zGy) is a unit of radiation.
Is the yoctogray to zeptogray conversion exact?
Yes. Both yoctogray and zeptogray 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.