Yoctosievert is 1e-24 sievert units.
Yoctosieverts to Sieverts Converter — ySv to Sv
Convert Yoctosievert (ySv) to Sievert (Sv) using the exact conversion factor (1 yoctosievert = 1e-24 sievert). See the formula, worked examples, conversion table, history, and common uses.
Yoctosieverts to Sieverts 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.
Sievert is equivalent dose.
Result = input x 1e-24 / 1.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Yoctosieverts to Sieverts
Yoctosievert and Sievert 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 sievert is equivalent dose.
Formula
sieverts = yoctosieverts × 1e-24
This factor comes from each unit's defined relationship to the category's base unit: 1 yoctosievert equals 1e-24 base units, and 1 sievert equals 1 base unit, so dividing one by the other gives the direct yoctosievert-to-sievert factor of 1e-24.
Simple example
1 ySv × 1e-24 = 1e-24 Sv
1 yoctosievert = 1e-24 sieverts.
Real-world example
10 ySv × 1e-24 = 1e-23 Sv
10 yoctosieverts = 1e-23 sieverts.
Conversion table
| Yoctosievert (ySv) | Sievert (Sv) |
|---|---|
| 0.001 ySv | 1e-27 Sv |
| 0.01 ySv | 1e-26 Sv |
| 0.1 ySv | 1e-25 Sv |
| 1 ySv | 1e-24 Sv |
| 10 ySv | 1e-23 Sv |
| 100 ySv | 1e-22 Sv |
Reverse conversion: Sievert to Yoctosievert
1e-24 Sv × 1e+24 = 1 ySv
1e-24 sieverts = 1 yoctosievert.
yoctosieverts = sieverts × 1e+24
For a page dedicated to this direction, see Sievert to Yoctosievert.
Understanding the Yoctosievert (ySv)
Yoctosievert is 1e-24 sievert units.
Understanding the Sievert
Sievert (Sv) measures equivalent radiation dose. The SI derived unit of equivalent radiation dose, weighting the physically absorbed dose (in gray) for how biologically damaging the specific type of radiation is. It is classified as a SI derived unit.
Where it's used: Universal — SI derived unit used worldwide in radiation protection
Sievert vs. gray. The gray measures physically absorbed radiation energy; the sievert adjusts that figure for biological harm, since equal absorbed doses of different radiation types (e.g. alpha particles vs. X-rays) can cause very different amounts of damage.
Uses of the Sievert today
- Radiation safety dose limits for workers and the public
- Medical imaging (CT scan, X-ray) dose reporting
- Background and environmental radiation exposure reporting
History of the Sievert
The sievert is named after Rolf Sievert (1896–1966), a Swedish medical physicist whose research on radiation measurement and safety standards was foundational to modern radiation protection practice; the unit was adopted by the CGPM in 1977.
Historical origin. Sievert was not the invention of a single named person; it developed through the process described above.
Sievert — sources
- BIPM SI Brochure, 9th edition — Official definition of the sievert as an SI derived unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many sieverts are in 1 yoctosievert?
1 yoctosievert equals 1e-24 sieverts, using the exact defined conversion factor rather than an estimate.
How do I convert yoctosievert to sievert?
Multiply the yoctosievert value by 1e-24. The converter above does this instantly to whatever precision you set.
How do I convert sievert back to yoctosievert?
Use the reverse factor: 1 sievert equals 1e+24 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 sievert?
Sievert (Sv) measures equivalent radiation dose. The SI derived unit of equivalent radiation dose, weighting the physically absorbed dose (in gray) for how biologically damaging the specific type of radiation is. It is classified as a SI derived unit.
Is the yoctosievert to sievert conversion exact?
Yes. Both yoctosievert and sievert are defined by fixed standards rather than physical artifacts, so the factor of 1e-24 used above is exact to as many digits as you choose to display.
What is the difference between sievert vs. gray?
The gray measures physically absorbed radiation energy; the sievert adjusts that figure for biological harm, since equal absorbed doses of different radiation types (e.g. alpha particles vs. X-rays) can cause very different amounts of damage.