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