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