Yoctosievert is 1e-24 sievert units.
Yoctosieverts to Microsieverts Converter — ySv to uSv
Convert Yoctosievert (ySv) to Microsievert (uSv) using the exact conversion factor (1 yoctosievert = 1e-18 microsievert). See the formula, worked examples, and conversion table.
Yoctosieverts to Microsieverts 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.
Microsievert is 0.000001 sievert units.
Result = input x 1e-24 / 1e-6.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Yoctosieverts to Microsieverts
Yoctosievert and Microsievert 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 microsievert is 0.000001 sievert units.
Formula
microsieverts = yoctosieverts × 1e-18
This factor comes from each unit's defined relationship to the category's base unit: 1 yoctosievert equals 1e-24 base units, and 1 microsievert equals 0.000001 base units, so dividing one by the other gives the direct yoctosievert-to-microsievert factor of 1e-18.
Simple example
1 ySv × 1e-18 = 1e-18 uSv
1 yoctosievert = 1e-18 microsieverts.
Real-world example
10 ySv × 1e-18 = 1e-17 uSv
10 yoctosieverts = 1e-17 microsieverts.
Conversion table
| Yoctosievert (ySv) | Microsievert (uSv) |
|---|---|
| 0.001 ySv | 1e-21 uSv |
| 0.01 ySv | 1e-20 uSv |
| 0.1 ySv | 1e-19 uSv |
| 1 ySv | 1e-18 uSv |
| 10 ySv | 1e-17 uSv |
| 100 ySv | 1e-16 uSv |
Reverse conversion: Microsievert to Yoctosievert
1e-18 uSv × 1e+18 = 1 ySv
1e-18 microsieverts = 1 yoctosieverts.
yoctosieverts = microsieverts × 1e+18
For a page dedicated to this direction, see Microsievert to Yoctosievert.
Understanding the Yoctosievert (ySv)
Yoctosievert is 1e-24 sievert units.
Understanding the Microsievert (uSv)
Microsievert is 0.000001 sievert units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many microsieverts are in 1 yoctosievert?
1 yoctosievert equals 1e-18 microsieverts, using the exact defined conversion factor rather than an estimate.
How do I convert yoctosievert to microsievert?
Multiply the yoctosievert value by 1e-18. The converter above does this instantly to whatever precision you set.
How do I convert microsievert back to yoctosievert?
Use the reverse factor: 1 microsievert equals 1e+18 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 microsievert?
Microsievert (uSv) is a unit of radiation.
Is the yoctosievert to microsievert conversion exact?
Yes. Both yoctosievert and microsievert are defined by fixed standards rather than physical artifacts, so the factor of 1e-18 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.