Microsievert is 0.000001 sievert units.
Microsieverts to Yoctosieverts Converter — uSv to ySv
Convert Microsievert (uSv) to Yoctosievert (ySv) using the exact conversion factor (1 microsievert = 1e+18 yoctosievert). See the formula, worked examples, and conversion table.
Microsieverts to Yoctosieverts 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.
Yoctosievert is 1e-24 sievert units.
Result = input x 1e-6 / 1e-24.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Microsieverts to Yoctosieverts
Microsievert and Yoctosievert 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: Microsievert is 0.000001 sievert units, and yoctosievert is 1e-24 sievert units.
Formula
yoctosieverts = microsieverts × 1e+18
This factor comes from each unit's defined relationship to the category's base unit: 1 microsievert equals 0.000001 base units, and 1 yoctosievert equals 1e-24 base units, so dividing one by the other gives the direct microsievert-to-yoctosievert factor of 1e+18.
Simple example
1 uSv × 1e+18 = 1e+18 ySv
1 microsievert = 1e+18 yoctosieverts.
Real-world example
10 uSv × 1e+18 = 1e+19 ySv
10 microsieverts = 1e+19 yoctosieverts.
Conversion table
| Microsievert (uSv) | Yoctosievert (ySv) |
|---|---|
| 0.001 uSv | 1e+15 ySv |
| 0.01 uSv | 1e+16 ySv |
| 0.1 uSv | 1e+17 ySv |
| 1 uSv | 1e+18 ySv |
| 10 uSv | 1e+19 ySv |
| 100 uSv | 1e+20 ySv |
Reverse conversion: Yoctosievert to Microsievert
1e+18 ySv × 1e-18 = 1 uSv
1e+18 yoctosieverts = 1 microsievert.
microsieverts = yoctosieverts × 1e-18
For a page dedicated to this direction, see Yoctosievert to Microsievert.
Understanding the Microsievert (uSv)
Microsievert is 0.000001 sievert units.
Understanding the Yoctosievert (ySv)
Yoctosievert is 1e-24 sievert units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many yoctosieverts are in 1 microsievert?
1 microsievert equals 1e+18 yoctosieverts, using the exact defined conversion factor rather than an estimate.
How do I convert microsievert to yoctosievert?
Multiply the microsievert value by 1e+18. The converter above does this instantly to whatever precision you set.
How do I convert yoctosievert back to microsievert?
Use the reverse factor: 1 yoctosievert equals 1e-18 microsieverts. You can also use the swap control in the converter above to flip the direction instantly.
What is a microsievert?
Microsievert (uSv) is a unit of radiation.
What is a yoctosievert?
Yoctosievert (ySv) is a unit of radiation.
Is the microsievert to yoctosievert conversion exact?
Yes. Both microsievert and yoctosievert 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.